# CH-J Tools

The Linux version uses a DEB package. Ubuntu 24.04 LTS is the primary test platform; the author has also tested both Alpha and Beta on Zorin OS.

> Free SSH client with SFTP file transfer, server diagnostics and checksum verification for Windows, macOS and Ubuntu / Zorin OS. Current version Beta 0.1.2.

Public languages: Čeština (cs-CZ), Deutsch (Deutschland) (de-DE), English (en), Български (bg), Dansk (da), Ελληνικά (el), Español (es), Eesti (et), Suomi (fi), Français (fr), Gaeilge (ga), Hrvatski (hr), Magyar (hu), Italiano (it), Lietuvių (lt), Latviešu (lv), Malti (mt), Nederlands (nl), Polski (pl), Português (pt-PT), Română (ro), Slovenčina (sk), Slovenščina (sl), Svenska (sv), Deutsch (Österreich) (de-AT), English (United Kingdom) (en-GB), English (United States) (en-US), Русский (ru), 简体中文 (zh-CN), 繁體中文 (zh-TW), 日本語 (ja), 한국어 (ko), हिन्दी (hi), বাংলা (bn), Bahasa Indonesia (id), Tiếng Việt (vi), ไทย (th), Bahasa Melayu (ms), Filipino (fil), العربية (ar), فارسی (fa), اردو (ur). Canonical host: https://tools.ch-j.eu.
Beta 0.1.2 with Rust and Tauri 2 is released under the new name CH-J Tools and is the default download. Alpha 0.1.1 and Beta 0.1.0 remain available as older releases. The gallery still shows the Alpha 0.1.1 interface in the language of this page. Published installer availability is determined by the release catalog and actual package files. Application source is published on this website under CH-J Proprietary Software License 1.14; GitHub contains the project README. Public source access does not grant an open-source license.
This index describes public content. The full application license remains authoritative; operational recommendations are informational and non-binding.

## Website

Localized technical documentation is undergoing language review. Compare unclear or security-sensitive passages with the English originals at https://tools.ch-j.eu/docs/i18n/en/README.md. This notice does not change the license.

- [Overview](https://tools.ch-j.eu/en/): Product and project introduction.
- [CH-J Keys2](https://keys2.ch-j.de/): OpenPGP ready for the post-quantum era. CH-J Keys2 (keys2.ch-j.de). A public keyserver on CH-J's own infrastructure. Publish and find public OpenPGP V4 and V6 certificates with support for all seven post-quantum algorithms in RFC 9980 and VKS/HKP interfaces. Private keys stay with you. CH-J Keys2 (keys2.ch-j.de) — Interoperability test, 8 November 2026: 30/30 certificates from CH-J Tools, GnuPG, rPGP and Sequoia PGP uploaded through VKS and retrieved by fingerprint in full, including subkeys. Development version · The PQC backend is experimental. The certificate preservation test is neither a security certification nor verification of every server feature.
- [Open Entropy Monitor](https://tools.ch-j.eu/entropy/): CH-J Entropy Monitor publishes independent 512-bit random values from the system CSPRNG every 30 seconds and keeps a 60-minute history (up to 120 values). Use them for demonstrations, application tests and experiments with shared public random inputs. Every value is public. Do not use it as a secret encryption key, password or authentication token.
- [Čeština](https://tools.ch-j.cz/cs/): Official language edition.
- [Deutsch (Deutschland)](https://tools.ch-j.de/de/): Official language edition.
- [English](https://tools.ch-j.eu/en/): Official language edition.
- [Български](https://tools.ch-j.eu/bg/): Official language edition.
- [Dansk](https://tools.ch-j.eu/da/): Official language edition.
- [Ελληνικά](https://tools.ch-j.eu/el/): Official language edition.
- [Español](https://tools.ch-j.eu/es/): Official language edition.
- [Eesti](https://tools.ch-j.eu/et/): Official language edition.
- [Suomi](https://tools.ch-j.eu/fi/): Official language edition.
- [Français](https://tools.ch-j.eu/fr/): Official language edition.
- [Gaeilge](https://tools.ch-j.eu/ga/): Official language edition.
- [Hrvatski](https://tools.ch-j.eu/hr/): Official language edition.
- [Magyar](https://tools.ch-j.eu/hu/): Official language edition.
- [Italiano](https://tools.ch-j.eu/it/): Official language edition.
- [Lietuvių](https://tools.ch-j.eu/lt/): Official language edition.
- [Latviešu](https://tools.ch-j.eu/lv/): Official language edition.
- [Malti](https://tools.ch-j.eu/mt/): Official language edition.
- [Nederlands](https://tools.ch-j.eu/nl/): Official language edition.
- [Polski](https://tools.ch-j.eu/pl/): Official language edition.
- [Português](https://tools.ch-j.eu/pt/): Official language edition.
- [Română](https://tools.ch-j.eu/ro/): Official language edition.
- [Slovenčina](https://tools.ch-j.eu/sk/): Official language edition.
- [Slovenščina](https://tools.ch-j.eu/sl/): Official language edition.
- [Svenska](https://tools.ch-j.eu/sv/): Official language edition.
- [Deutsch (Österreich)](https://tools.ch-j.eu/de-at/): Official language edition.
- [English (United Kingdom)](https://tools.ch-j.eu/en-gb/): Official language edition.
- [English (United States)](https://tools.ch-j.eu/en-us/): Official language edition.
- [Русский](https://tools.ch-j.eu/ru/): Official language edition.
- [简体中文](https://tools.ch-j.eu/zh-cn/): Official language edition.
- [繁體中文](https://tools.ch-j.eu/zh-tw/): Official language edition.
- [日本語](https://tools.ch-j.eu/ja/): Official language edition.
- [한국어](https://tools.ch-j.eu/ko/): Official language edition.
- [हिन्दी](https://tools.ch-j.eu/hi/): Official language edition.
- [বাংলা](https://tools.ch-j.eu/bn/): Official language edition.
- [Bahasa Indonesia](https://tools.ch-j.eu/id/): Official language edition.
- [Tiếng Việt](https://tools.ch-j.eu/vi/): Official language edition.
- [ไทย](https://tools.ch-j.eu/th/): Official language edition.
- [Bahasa Melayu](https://tools.ch-j.eu/ms/): Official language edition.
- [Filipino](https://tools.ch-j.eu/fil/): Official language edition.
- [العربية](https://tools.ch-j.eu/ar/): Official language edition.
- [فارسی](https://tools.ch-j.eu/fa/): Official language edition.
- [اردو](https://tools.ch-j.eu/ur/): Official language edition.
- [Downloads and releases](https://tools.ch-j.eu/en/releases/): First-install packages, update packages, channels and verification details.
- [Documentation](https://tools.ch-j.eu/en/documentation/): Getting started and vault.

## Documentation chapters

- [Installation](https://tools.ch-j.eu/en/documentation/installation/): Public guide.
- [SSH and SFTP](https://tools.ch-j.eu/en/documentation/ssh-and-sftp/): Public guide.
- [Plugins and permissions](https://tools.ch-j.eu/en/documentation/plugins/): Public guide.
- [Diagnostics](https://tools.ch-j.eu/en/documentation/server-diagnostics/): Public guide.
- [Hashing and verification](https://tools.ch-j.eu/en/documentation/hashes-and-checksums/): Public guide.
- [Security and backups](https://tools.ch-j.eu/en/documentation/security-and-backups/): Public guide.
- [Updates and signatures](https://tools.ch-j.eu/en/documentation/updates-and-gpg/): Public guide.
- [Technical reference](https://tools.ch-j.eu/en/documentation/technical-reference/): Public guide.

## Task guides

- [SSH client for Windows, macOS and Linux](https://tools.ch-j.eu/en/features/ssh-client/): Connect to a Linux server with an SSH profile, verify its host key and work in the CH-J Server Manager terminal.
- [SFTP file manager and remote editor](https://tools.ch-j.eu/en/features/sftp-file-manager-and-editor/): Transfer and edit remote files over SSH using File Manager with save conflict detection.
- [HTTP/2, HTTP/3 and TLS diagnostics](https://tools.ch-j.eu/en/features/http3-and-tls-diagnostics/): Check the actual HTTP protocol with the bundled client and inspect TLS 1.2/1.3.
- [SHA-512, BLAKE3 and file verification](https://tools.ch-j.eu/en/features/sha512-and-blake3/): Calculate local checksums, compare files or verify an expected SHA-512 or BLAKE3 digest.
- [Linux server monitoring over SSH](https://tools.ch-j.eu/en/features/linux-server-monitoring/): Inspect CPU, RAM, swap, filesystems, uptime and network interfaces with the System Monitor plugin.
- [Verify the GPG signature of a download](https://tools.ch-j.eu/en/features/verify-gpg-signature/): Before running an installer, check its OpenPGP signature, key fingerprint and complete SHA-512 checksum.
- [Install on Ubuntu through APT](https://tools.ch-j.eu/en/features/ubuntu-apt/): Set up the signed CH-J APT repository on Ubuntu 24.04 amd64 and install CH-J Tools (package ch-j-tools) from the Beta channel.

## Documentation

- [English — README.md](https://tools.ch-j.eu/docs/i18n/en/README.md): Localized technical documentation.
- [English — apt-repository.md](https://tools.ch-j.eu/docs/i18n/en/apt-repository.md): Localized technical documentation.
- [English — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/en/biometric-unlock.md): Localized technical documentation.
- [English — http-runtime.md](https://tools.ch-j.eu/docs/i18n/en/http-runtime.md): Localized technical documentation.
- [English — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/en/license-acceptance.md): Localized technical documentation.
- [English — operational-safety-and-backup-guidance.md](https://tools.ch-j.eu/docs/i18n/en/operational-safety-and-backup-guidance.md): Localized technical documentation.
- [English — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/en/remote-editor-latency.md): Localized technical documentation.
- [English — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/en/server-diagnostics.md): Localized technical documentation.
- [Български — README.md](https://tools.ch-j.eu/docs/i18n/bg/README.md): Localized technical documentation.
- [Български — apt-repository.md](https://tools.ch-j.eu/docs/i18n/bg/apt-repository.md): Localized technical documentation.
- [Български — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/bg/biometric-unlock.md): Localized technical documentation.
- [Български — http-runtime.md](https://tools.ch-j.eu/docs/i18n/bg/http-runtime.md): Localized technical documentation.
- [Български — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/bg/license-acceptance.md): Localized technical documentation.
- [Български — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/bg/remote-editor-latency.md): Localized technical documentation.
- [Български — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/bg/server-diagnostics.md): Localized technical documentation.
- [Dansk — README.md](https://tools.ch-j.eu/docs/i18n/da/README.md): Localized technical documentation.
- [Dansk — apt-repository.md](https://tools.ch-j.eu/docs/i18n/da/apt-repository.md): Localized technical documentation.
- [Dansk — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/da/biometric-unlock.md): Localized technical documentation.
- [Dansk — http-runtime.md](https://tools.ch-j.eu/docs/i18n/da/http-runtime.md): Localized technical documentation.
- [Dansk — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/da/license-acceptance.md): Localized technical documentation.
- [Dansk — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/da/remote-editor-latency.md): Localized technical documentation.
- [Dansk — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/da/server-diagnostics.md): Localized technical documentation.
- [Ελληνικά — README.md](https://tools.ch-j.eu/docs/i18n/el/README.md): Localized technical documentation.
- [Ελληνικά — apt-repository.md](https://tools.ch-j.eu/docs/i18n/el/apt-repository.md): Localized technical documentation.
- [Ελληνικά — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/el/biometric-unlock.md): Localized technical documentation.
- [Ελληνικά — http-runtime.md](https://tools.ch-j.eu/docs/i18n/el/http-runtime.md): Localized technical documentation.
- [Ελληνικά — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/el/license-acceptance.md): Localized technical documentation.
- [Ελληνικά — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/el/remote-editor-latency.md): Localized technical documentation.
- [Ελληνικά — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/el/server-diagnostics.md): Localized technical documentation.
- [Español — README.md](https://tools.ch-j.eu/docs/i18n/es/README.md): Localized technical documentation.
- [Español — apt-repository.md](https://tools.ch-j.eu/docs/i18n/es/apt-repository.md): Localized technical documentation.
- [Español — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/es/biometric-unlock.md): Localized technical documentation.
- [Español — http-runtime.md](https://tools.ch-j.eu/docs/i18n/es/http-runtime.md): Localized technical documentation.
- [Español — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/es/license-acceptance.md): Localized technical documentation.
- [Español — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/es/remote-editor-latency.md): Localized technical documentation.
- [Español — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/es/server-diagnostics.md): Localized technical documentation.
- [Eesti — README.md](https://tools.ch-j.eu/docs/i18n/et/README.md): Localized technical documentation.
- [Eesti — apt-repository.md](https://tools.ch-j.eu/docs/i18n/et/apt-repository.md): Localized technical documentation.
- [Eesti — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/et/biometric-unlock.md): Localized technical documentation.
- [Eesti — http-runtime.md](https://tools.ch-j.eu/docs/i18n/et/http-runtime.md): Localized technical documentation.
- [Eesti — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/et/license-acceptance.md): Localized technical documentation.
- [Eesti — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/et/remote-editor-latency.md): Localized technical documentation.
- [Eesti — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/et/server-diagnostics.md): Localized technical documentation.
- [Suomi — README.md](https://tools.ch-j.eu/docs/i18n/fi/README.md): Localized technical documentation.
- [Suomi — apt-repository.md](https://tools.ch-j.eu/docs/i18n/fi/apt-repository.md): Localized technical documentation.
- [Suomi — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/fi/biometric-unlock.md): Localized technical documentation.
- [Suomi — http-runtime.md](https://tools.ch-j.eu/docs/i18n/fi/http-runtime.md): Localized technical documentation.
- [Suomi — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/fi/license-acceptance.md): Localized technical documentation.
- [Suomi — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/fi/remote-editor-latency.md): Localized technical documentation.
- [Suomi — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/fi/server-diagnostics.md): Localized technical documentation.
- [Français — README.md](https://tools.ch-j.eu/docs/i18n/fr/README.md): Localized technical documentation.
- [Français — apt-repository.md](https://tools.ch-j.eu/docs/i18n/fr/apt-repository.md): Localized technical documentation.
- [Français — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/fr/biometric-unlock.md): Localized technical documentation.
- [Français — http-runtime.md](https://tools.ch-j.eu/docs/i18n/fr/http-runtime.md): Localized technical documentation.
- [Français — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/fr/license-acceptance.md): Localized technical documentation.
- [Français — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/fr/remote-editor-latency.md): Localized technical documentation.
- [Français — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/fr/server-diagnostics.md): Localized technical documentation.
- [Gaeilge — README.md](https://tools.ch-j.eu/docs/i18n/ga/README.md): Localized technical documentation.
- [Gaeilge — apt-repository.md](https://tools.ch-j.eu/docs/i18n/ga/apt-repository.md): Localized technical documentation.
- [Gaeilge — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/ga/biometric-unlock.md): Localized technical documentation.
- [Gaeilge — http-runtime.md](https://tools.ch-j.eu/docs/i18n/ga/http-runtime.md): Localized technical documentation.
- [Gaeilge — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/ga/license-acceptance.md): Localized technical documentation.
- [Gaeilge — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/ga/remote-editor-latency.md): Localized technical documentation.
- [Gaeilge — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/ga/server-diagnostics.md): Localized technical documentation.
- [Hrvatski — README.md](https://tools.ch-j.eu/docs/i18n/hr/README.md): Localized technical documentation.
- [Hrvatski — apt-repository.md](https://tools.ch-j.eu/docs/i18n/hr/apt-repository.md): Localized technical documentation.
- [Hrvatski — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/hr/biometric-unlock.md): Localized technical documentation.
- [Hrvatski — http-runtime.md](https://tools.ch-j.eu/docs/i18n/hr/http-runtime.md): Localized technical documentation.
- [Hrvatski — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/hr/license-acceptance.md): Localized technical documentation.
- [Hrvatski — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/hr/remote-editor-latency.md): Localized technical documentation.
- [Hrvatski — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/hr/server-diagnostics.md): Localized technical documentation.
- [Magyar — README.md](https://tools.ch-j.eu/docs/i18n/hu/README.md): Localized technical documentation.
- [Magyar — apt-repository.md](https://tools.ch-j.eu/docs/i18n/hu/apt-repository.md): Localized technical documentation.
- [Magyar — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/hu/biometric-unlock.md): Localized technical documentation.
- [Magyar — http-runtime.md](https://tools.ch-j.eu/docs/i18n/hu/http-runtime.md): Localized technical documentation.
- [Magyar — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/hu/license-acceptance.md): Localized technical documentation.
- [Magyar — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/hu/remote-editor-latency.md): Localized technical documentation.
- [Magyar — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/hu/server-diagnostics.md): Localized technical documentation.
- [Italiano — README.md](https://tools.ch-j.eu/docs/i18n/it/README.md): Localized technical documentation.
- [Italiano — apt-repository.md](https://tools.ch-j.eu/docs/i18n/it/apt-repository.md): Localized technical documentation.
- [Italiano — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/it/biometric-unlock.md): Localized technical documentation.
- [Italiano — http-runtime.md](https://tools.ch-j.eu/docs/i18n/it/http-runtime.md): Localized technical documentation.
- [Italiano — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/it/license-acceptance.md): Localized technical documentation.
- [Italiano — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/it/remote-editor-latency.md): Localized technical documentation.
- [Italiano — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/it/server-diagnostics.md): Localized technical documentation.
- [Lietuvių — README.md](https://tools.ch-j.eu/docs/i18n/lt/README.md): Localized technical documentation.
- [Lietuvių — apt-repository.md](https://tools.ch-j.eu/docs/i18n/lt/apt-repository.md): Localized technical documentation.
- [Lietuvių — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/lt/biometric-unlock.md): Localized technical documentation.
- [Lietuvių — http-runtime.md](https://tools.ch-j.eu/docs/i18n/lt/http-runtime.md): Localized technical documentation.
- [Lietuvių — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/lt/license-acceptance.md): Localized technical documentation.
- [Lietuvių — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/lt/remote-editor-latency.md): Localized technical documentation.
- [Lietuvių — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/lt/server-diagnostics.md): Localized technical documentation.
- [Latviešu — README.md](https://tools.ch-j.eu/docs/i18n/lv/README.md): Localized technical documentation.
- [Latviešu — apt-repository.md](https://tools.ch-j.eu/docs/i18n/lv/apt-repository.md): Localized technical documentation.
- [Latviešu — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/lv/biometric-unlock.md): Localized technical documentation.
- [Latviešu — http-runtime.md](https://tools.ch-j.eu/docs/i18n/lv/http-runtime.md): Localized technical documentation.
- [Latviešu — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/lv/license-acceptance.md): Localized technical documentation.
- [Latviešu — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/lv/remote-editor-latency.md): Localized technical documentation.
- [Latviešu — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/lv/server-diagnostics.md): Localized technical documentation.
- [Malti — README.md](https://tools.ch-j.eu/docs/i18n/mt/README.md): Localized technical documentation.
- [Malti — apt-repository.md](https://tools.ch-j.eu/docs/i18n/mt/apt-repository.md): Localized technical documentation.
- [Malti — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/mt/biometric-unlock.md): Localized technical documentation.
- [Malti — http-runtime.md](https://tools.ch-j.eu/docs/i18n/mt/http-runtime.md): Localized technical documentation.
- [Malti — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/mt/license-acceptance.md): Localized technical documentation.
- [Malti — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/mt/remote-editor-latency.md): Localized technical documentation.
- [Malti — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/mt/server-diagnostics.md): Localized technical documentation.
- [Nederlands — README.md](https://tools.ch-j.eu/docs/i18n/nl/README.md): Localized technical documentation.
- [Nederlands — apt-repository.md](https://tools.ch-j.eu/docs/i18n/nl/apt-repository.md): Localized technical documentation.
- [Nederlands — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/nl/biometric-unlock.md): Localized technical documentation.
- [Nederlands — http-runtime.md](https://tools.ch-j.eu/docs/i18n/nl/http-runtime.md): Localized technical documentation.
- [Nederlands — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/nl/license-acceptance.md): Localized technical documentation.
- [Nederlands — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/nl/remote-editor-latency.md): Localized technical documentation.
- [Nederlands — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/nl/server-diagnostics.md): Localized technical documentation.
- [Polski — README.md](https://tools.ch-j.eu/docs/i18n/pl/README.md): Localized technical documentation.
- [Polski — apt-repository.md](https://tools.ch-j.eu/docs/i18n/pl/apt-repository.md): Localized technical documentation.
- [Polski — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/pl/biometric-unlock.md): Localized technical documentation.
- [Polski — http-runtime.md](https://tools.ch-j.eu/docs/i18n/pl/http-runtime.md): Localized technical documentation.
- [Polski — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/pl/license-acceptance.md): Localized technical documentation.
- [Polski — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/pl/remote-editor-latency.md): Localized technical documentation.
- [Polski — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/pl/server-diagnostics.md): Localized technical documentation.
- [Português — README.md](https://tools.ch-j.eu/docs/i18n/pt/README.md): Localized technical documentation.
- [Português — apt-repository.md](https://tools.ch-j.eu/docs/i18n/pt/apt-repository.md): Localized technical documentation.
- [Português — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/pt/biometric-unlock.md): Localized technical documentation.
- [Português — http-runtime.md](https://tools.ch-j.eu/docs/i18n/pt/http-runtime.md): Localized technical documentation.
- [Português — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/pt/license-acceptance.md): Localized technical documentation.
- [Português — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/pt/remote-editor-latency.md): Localized technical documentation.
- [Português — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/pt/server-diagnostics.md): Localized technical documentation.
- [Română — README.md](https://tools.ch-j.eu/docs/i18n/ro/README.md): Localized technical documentation.
- [Română — apt-repository.md](https://tools.ch-j.eu/docs/i18n/ro/apt-repository.md): Localized technical documentation.
- [Română — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/ro/biometric-unlock.md): Localized technical documentation.
- [Română — http-runtime.md](https://tools.ch-j.eu/docs/i18n/ro/http-runtime.md): Localized technical documentation.
- [Română — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/ro/license-acceptance.md): Localized technical documentation.
- [Română — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/ro/remote-editor-latency.md): Localized technical documentation.
- [Română — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/ro/server-diagnostics.md): Localized technical documentation.
- [Slovenčina — README.md](https://tools.ch-j.eu/docs/i18n/sk/README.md): Localized technical documentation.
- [Slovenčina — apt-repository.md](https://tools.ch-j.eu/docs/i18n/sk/apt-repository.md): Localized technical documentation.
- [Slovenčina — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/sk/biometric-unlock.md): Localized technical documentation.
- [Slovenčina — http-runtime.md](https://tools.ch-j.eu/docs/i18n/sk/http-runtime.md): Localized technical documentation.
- [Slovenčina — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/sk/license-acceptance.md): Localized technical documentation.
- [Slovenčina — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/sk/remote-editor-latency.md): Localized technical documentation.
- [Slovenčina — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/sk/server-diagnostics.md): Localized technical documentation.
- [Slovenščina — README.md](https://tools.ch-j.eu/docs/i18n/sl/README.md): Localized technical documentation.
- [Slovenščina — apt-repository.md](https://tools.ch-j.eu/docs/i18n/sl/apt-repository.md): Localized technical documentation.
- [Slovenščina — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/sl/biometric-unlock.md): Localized technical documentation.
- [Slovenščina — http-runtime.md](https://tools.ch-j.eu/docs/i18n/sl/http-runtime.md): Localized technical documentation.
- [Slovenščina — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/sl/license-acceptance.md): Localized technical documentation.
- [Slovenščina — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/sl/remote-editor-latency.md): Localized technical documentation.
- [Slovenščina — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/sl/server-diagnostics.md): Localized technical documentation.
- [Svenska — README.md](https://tools.ch-j.eu/docs/i18n/sv/README.md): Localized technical documentation.
- [Svenska — apt-repository.md](https://tools.ch-j.eu/docs/i18n/sv/apt-repository.md): Localized technical documentation.
- [Svenska — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/sv/biometric-unlock.md): Localized technical documentation.
- [Svenska — http-runtime.md](https://tools.ch-j.eu/docs/i18n/sv/http-runtime.md): Localized technical documentation.
- [Svenska — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/sv/license-acceptance.md): Localized technical documentation.
- [Svenska — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/sv/remote-editor-latency.md): Localized technical documentation.
- [Svenska — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/sv/server-diagnostics.md): Localized technical documentation.
- [Deutsch (Österreich) — README.md](https://tools.ch-j.eu/docs/i18n/de-at/README.md): Localized technical documentation.
- [Deutsch (Österreich) — apt-repository.md](https://tools.ch-j.eu/docs/i18n/de-at/apt-repository.md): Localized technical documentation.
- [Deutsch (Österreich) — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/de-at/biometric-unlock.md): Localized technical documentation.
- [Deutsch (Österreich) — http-runtime.md](https://tools.ch-j.eu/docs/i18n/de-at/http-runtime.md): Localized technical documentation.
- [Deutsch (Österreich) — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/de-at/license-acceptance.md): Localized technical documentation.
- [Deutsch (Österreich) — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/de-at/remote-editor-latency.md): Localized technical documentation.
- [Deutsch (Österreich) — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/de-at/server-diagnostics.md): Localized technical documentation.
- [English (United Kingdom) — README.md](https://tools.ch-j.eu/docs/i18n/en-gb/README.md): Localized technical documentation.
- [English (United Kingdom) — apt-repository.md](https://tools.ch-j.eu/docs/i18n/en-gb/apt-repository.md): Localized technical documentation.
- [English (United Kingdom) — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/en-gb/biometric-unlock.md): Localized technical documentation.
- [English (United Kingdom) — http-runtime.md](https://tools.ch-j.eu/docs/i18n/en-gb/http-runtime.md): Localized technical documentation.
- [English (United Kingdom) — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/en-gb/license-acceptance.md): Localized technical documentation.
- [English (United Kingdom) — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/en-gb/remote-editor-latency.md): Localized technical documentation.
- [English (United Kingdom) — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/en-gb/server-diagnostics.md): Localized technical documentation.
- [English (United States) — README.md](https://tools.ch-j.eu/docs/i18n/en-us/README.md): Localized technical documentation.
- [English (United States) — apt-repository.md](https://tools.ch-j.eu/docs/i18n/en-us/apt-repository.md): Localized technical documentation.
- [English (United States) — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/en-us/biometric-unlock.md): Localized technical documentation.
- [English (United States) — http-runtime.md](https://tools.ch-j.eu/docs/i18n/en-us/http-runtime.md): Localized technical documentation.
- [English (United States) — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/en-us/license-acceptance.md): Localized technical documentation.
- [English (United States) — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/en-us/remote-editor-latency.md): Localized technical documentation.
- [English (United States) — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/en-us/server-diagnostics.md): Localized technical documentation.
- [Русский — README.md](https://tools.ch-j.eu/docs/i18n/ru/README.md): Localized technical documentation.
- [Русский — apt-repository.md](https://tools.ch-j.eu/docs/i18n/ru/apt-repository.md): Localized technical documentation.
- [Русский — biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/ru/biometric-unlock.md): Localized technical documentation.
- [Русский — http-runtime.md](https://tools.ch-j.eu/docs/i18n/ru/http-runtime.md): Localized technical documentation.
- [Русский — license-acceptance.md](https://tools.ch-j.eu/docs/i18n/ru/license-acceptance.md): Localized technical documentation.
- [Русский — remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/ru/remote-editor-latency.md): Localized technical documentation.
- [Русский — server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/ru/server-diagnostics.md): Localized technical documentation.
- [README.md](https://tools.ch-j.eu/docs/i18n/en/README.md): Public HTML documentation; raw download is optional.
- [server-diagnostics.md](https://tools.ch-j.eu/docs/i18n/en/server-diagnostics.md): Public HTML documentation; raw download is optional.
- [remote-editor-latency.md](https://tools.ch-j.eu/docs/i18n/en/remote-editor-latency.md): Public HTML documentation; raw download is optional.
- [biometric-unlock.md](https://tools.ch-j.eu/docs/i18n/en/biometric-unlock.md): Public HTML documentation; raw download is optional.
- [license-acceptance.md](https://tools.ch-j.eu/docs/i18n/en/license-acceptance.md): Public HTML documentation; raw download is optional.
- [apt-repository.md](https://tools.ch-j.eu/docs/i18n/en/apt-repository.md): Public HTML documentation; raw download is optional.
- [http-runtime.md](https://tools.ch-j.eu/docs/i18n/en/http-runtime.md): Public HTML documentation; raw download is optional.
- [operational-safety-and-backup-guidance.md](https://tools.ch-j.eu/docs/i18n/en/operational-safety-and-backup-guidance.md): Public HTML documentation; raw download is optional.
- [Complete license 1.14](https://tools.ch-j.eu/LICENSE.txt): Exact English license terms.
- [Licensing information](https://tools.ch-j.eu/en/license/): Acceptance, guidance and third-party notices.
- [Privacy](https://tools.ch-j.eu/en/privacy/): Website privacy and cookies.

## Optional

- [Source browser](https://tools.ch-j.eu/en/source/): Versioned published desktop application source.
- [FAQ](https://tools.ch-j.eu/en/faq/): Installation, security, updates and plugins.
- [Community](https://tools.ch-j.eu/en/community/): User-contributed topics and replies.

## SM Mobile

A standalone mobile SSH and SFTP client for Android, iPhone and iPad. Direct server connections, encrypted local Vault, no cloud account or telemetry. Development alpha 0.0.3. Back up your data and test on non-production servers first.

- [SM Mobile](https://tools.ch-j.eu/en/?edition=mobile): Independent mobile edition.
- [Mobile source browser](https://tools.ch-j.eu/en/source/?edition=mobile): Public mobile source overview.
- [Mobile GitHub](https://github.com/ch-j-code/SM-Mobile): README only.
- [Full public text](https://tools.ch-j.eu/llms-full.txt): Expanded reference snapshot.
- [RSS feed](https://tools.ch-j.eu/feed.xml): Published releases.
- [Sitemap](https://tools.ch-j.eu/Sitemap): Canonical public URLs for this hostname.
- [Security contact](https://tools.ch-j.eu/.well-known/security.txt): Vulnerability reporting contact.

## From Electron to Rust and Tauri: a new foundation for Server Manager

- [From Electron to Rust and Tauri: a new foundation for Server Manager](https://tools.ch-j.eu/en/features/rust-and-tauri-new-foundation/): Version 0.1.1 moves to Rust and Tauri 2. Discover the architectural benefits behind the next desktop generation.
- [Moving to 0.1.2: your data and the release channels](https://tools.ch-j.eu/en/features/moving-to-0-1-1-data-and-releases/): What the Rust and Tauri transition means for existing users, profiles and the encrypted vault.

### New in Beta 0.1.2

**New name CH-J Tools** — Server Manager is now called CH-J Tools. On first launch, the existing data folder moves automatically, the Windows installer removes the old installation, and the ch-j-tools DEB package replaces ch-j-server-manager.

**Signed and notarized macOS version** — The DMG package is signed with an Apple Developer ID Application certificate and notarized by Apple. Each installer file also has a detached OpenPGP signature and a SHA-512 checksum.

**Standby Helper and signatures from the context menu** — A small background process without WebView is enabled after installation and can be disabled in Settings. It adds Verify signature and Sign (OpenPGP) actions to Finder, Explorer, Nautilus, Nemo and Dolphin. Quick verification uses keys from Keychain, saved public keys, a selected key file or a key from keys.ch-j.de based on the fingerprint in the signature, and shows the key's revocation status on keys.ch-j.de.

**Apache Manager, Rsync Manager and Network Manager** — Apache Manager manages sites, modules, PHP, TLS and reverse proxies with change previews. Rsync Manager copies, mirrors and backs up with previews and scheduling. Network Manager shows interfaces, routes, ports and the firewall; it rolls back a network change if you do not confirm it after logging in again via SSH.

**Post-quantum cryptography** — Keychain and Key Generator offer hybrid and post-quantum OpenPGP algorithms under RFC 9980 (ML-DSA, SLH-DSA, ML-KEM) and the SSH key ssh-mldsa44-ed25519. SSH connections offer three hybrid ML-KEM key exchanges under RFC 10042, with “prefer hybrid” or “hybrid only” options.

**Terminal, modules and settings** — The terminal suggests commands based on the connected system and offers appearance profiles. Modules open in the main window and can be moved to their own window. Settings is divided into sections, and the application starts faster on Windows.

**What the Beta does not yet offer** — Port forwarding, remote archive extraction, dragging files from Finder or Explorer, and copying between servers requiring sudo are not yet available. The Windows installer is not signed with a publisher certificate. The test on 8 November 2026 confirmed a Hagrid bug on keys.ch-j.de: for 15 certificates with a PQ primary key, the server returns only the primary key without signatures or subkeys, although the application reports a successful upload. Beta 0.1.2 still uses this server. Local certificates remain complete. The loss of signatures and subkeys is the reason for moving future application versions to CH-J's own keyserver, CH-J Keys2 (keys2.ch-j.de). It was Keys2 that preserved 30/30 certificates including subkeys in the VKS test. The original keys.ch-j.de uses Hagrid and is a separate service. The transition includes a planned migration of public keys from keys.ch-j.de to keys2.ch-j.de so they remain available to users. Missing signatures and subkeys in incomplete PQ certificates will need to be restored from a complete public certificate.

## All guides and articles

- [All guides and articles](https://tools.ch-j.eu/en/features/): Practical SSH guides, troubleshooting, comparisons and Server Manager news.
- [PuTTY vs. CH-J Server Manager: which SSH client fits?](https://tools.ch-j.eu/en/features/putty-vs-ch-j-server-manager/): Compare terminal access, file transfers and administration workflows, including the strengths and limits of both tools.
- [Fix SSH connection refused, timeout and permission denied](https://tools.ch-j.eu/en/features/fix-ssh-connection-refused-timeout-permission-denied/): Identify whether SSH fails at the port, network or authentication stage before changing server configuration.
- [Ed25519 vs. RSA: choosing and installing SSH keys](https://tools.ch-j.eu/en/features/ssh-keys-ed25519-vs-rsa/): Choose a compatible key, protect its private half and test the new login before removing the old access method.
- [Set up OpenSSH on Windows Server 2022 and 2025](https://tools.ch-j.eu/en/features/openssh-windows-server-2022-2025/): Check the Windows feature, start SSH, restrict network access and verify the host key before connecting.
- [SHA-256 vs. SHA-512 vs. BLAKE3: which checksum should you use?](https://tools.ch-j.eu/en/features/sha-256-vs-sha-512-vs-blake3/): How the three algorithms differ in security, speed and compatibility, what a checksum does not prove, and which to choose.
- [How to monitor Proxmox VE over SSH](https://tools.ch-j.eu/en/features/monitor-proxmox-ve-over-ssh/): Commands for checking host, guests and storage on Proxmox VE, plus what generic Linux monitoring sees and misses there.
- [SSH users and root access: a safe setup on Linux](https://tools.ch-j.eu/en/features/ssh-users-and-root-access/): Create an administrator account, install its key, test sudo and only then restrict root login, without locking yourself out.
- [How to verify that HTTP/3 and QUIC really work](https://tools.ch-j.eu/en/features/check-http3-quic/): Why an Alt-Svc header is not proof, what to check in NGINX and the firewall, and how to confirm a real QUIC transfer.
- [LVM or a standard partition: which should you choose for a server?](https://tools.ch-j.eu/en/features/lvm-vs-standard-partition/): What LVM adds over a plain partition, what it costs, and how to decide for a small VPS or a server with several disks.
- [How to read RAM, cache and swap on a Linux server](https://tools.ch-j.eu/en/features/read-linux-memory-ram-cache-swap/): What the columns of free mean, why high memory use is often fine, and which signs really point to a memory shortage.
- [How to edit files in /etc over SFTP and sudo](https://tools.ch-j.eu/en/features/edit-etc-files-sftp-sudo/): Why SFTP gets permission denied in /etc, and safe ways to change a configuration file without opening up root access.
- [A remote file changed while you were editing it: how to avoid overwriting it](https://tools.ch-j.eu/en/features/remote-file-changed-while-editing/): How to detect that someone else changed a server file during your edit, compare versions and save without losing either change.
- [Server is online but SSH port 22 is not responding](https://tools.ch-j.eu/en/features/server-online-port-22-not-responding/): Work through the client, network, firewall and sshd in order to find why the server answers but SSH does not.
- [Ping fails but SSH and HTTPS work: why, and is it a problem?](https://tools.ch-j.eu/en/features/ping-fails-ssh-https-work/): Why a server can ignore ping and still run normally, how to test the services directly, and when blocked ICMP causes real faults.
- [SSH clients for Windows: alternatives to PuTTY and Termius](https://tools.ch-j.eu/en/features/ssh-client-for-windows/): A neutral overview of Windows OpenSSH, PuTTY, WinSCP, Termius, MobaXterm and CH-J Server Manager, and how to choose.
- [SSH host key changed: what the warning means and what to do](https://tools.ch-j.eu/en/features/ssh-host-key-changed/): Find out why a server presents a new host key, verify it through another channel and replace the stored entry safely.
- [Managing NGINX without taking the website down](https://tools.ch-j.eu/en/features/manage-nginx-without-downtime/): Back up the configuration, test it with nginx -t, apply it with a graceful reload and roll back when something fails.
- [How to manage several SSH servers at once](https://tools.ch-j.eu/en/features/manage-multiple-ssh-servers/): Keep several servers organised with SSH aliases and side-by-side terminals, and avoid running a command on the wrong one.
- [How to grow a Linux server disk without losing data](https://tools.ch-j.eu/en/features/grow-linux-server-disk/): After enlarging a virtual disk, extend the partition, LVM and the ext4 or XFS file system in the right order.
- [How to create or grow swap on Ubuntu and Debian](https://tools.ch-j.eu/en/features/create-swap-file-ubuntu-debian/): Check memory use, create a swap file, make it persistent and resize it safely, with notes on Btrfs and zram.
- [Resource use: Electron 0.1.0, Rust + Tauri 0.1.1 and CH-J Tools 0.1.2 compared](https://tools.ch-j.eu/en/features/resource-use-0-1-0-vs-0-1-1/): Measured package size, disk space, RAM and CPU on macOS, Windows and Ubuntu for Beta 0.1.0, Alpha 0.1.1 and Beta 0.1.2, including measurement limitations.
- [How to connect through an SSH jump host (bastion)](https://tools.ch-j.eu/en/features/ssh-jump-host-bastion/): Reach internal servers through one or more jump hosts, verify every host key and avoid forwarding your agent.
- [SFTP transfer between two Linux servers without SCP](https://tools.ch-j.eu/en/features/sftp-transfer-between-two-linux-servers/): Copy files between two remote servers through your own computer, handle conflicts and verify the result with SHA-256.

Beta 0.1.2: interface in 42 languages; some of the latest text is still displayed in English, and the quick signature verification window is in Czech, German and English. The license and operational security instructions are in Czech, German and English. This website: 42 published language and regional variants.