PuTTY 0.85

PuTTY: Lightweight, Open-Source SSH and Telnet Client for Windows and Unix

PuTTY, authored and maintained by Simon Tatham and contributors, is a long-established open-source terminal emulator and network file transfer client widely used for secure remote administration. Popular for its small footprint and portability, PuTTY provides stable SSH, Telnet, rlogin, serial and raw TCP connections while remaining actively developed and frequently updated on the official download and latest build pages.

Cross-Platform Builds, Portable Executables and Easy Downloads

PuTTY is commonly used on Windows but also compiles for Unix. Official downloads include standalone executables (putty.exe) and a suite of companion tools—PuTTYgen, PSCP, PSFTP, Pageant—available from the project’s download pages. Portable versions and 64-bit builds make deployment straightforward for administrators who prefer single-file utilities or USB-based toolkits.

Robust Protocol Support and Secure Connections

PuTTY supports SSH-1 and SSH-2, Telnet, rlogin, raw TCP and serial connections. It implements modern cryptographic algorithms and provides encrypted sessions to protect credentials and data in transit. Features such as public key authentication, AES/ChaCha20 ciphers, and configurable key-exchange methods let users harden connections to meet current security standards.

Complete Suite for Key and Session Management

• PuTTYgen — generate RSA, DSA, ECDSA and Ed25519 key pairs for passwordless SSH authentication.
• Pageant — an SSH authentication agent for caching private keys during a desktop session.
• PSCP/PSFTP — command-line secure copy and SFTP clients for scripted file transfers and automation.

Advanced Terminal Emulation and Customization

The terminal supports VT100, xterm and other emulation modes with configurable fonts, colours, line-drawing, keyboard mappings and translation settings. Users can fine-tune behaviour for copy/paste, cursor keys and local echo, helping it integrate cleanly into diverse workflows and automation scripts.

Flexible Session and Profile Management

PuTTY lets users save named sessions that store hostnames, ports, protocols, and extensive connection settings. Registry-backed profiles and exportable settings enable quick recovery of frequent connections, while command-line options support launching saved sessions from scripts or shortcuts.

Port Forwarding, Tunneling and X11 Support

Local, remote and dynamic port forwarding make PuTTY useful for tunnelling services securely over SSH. X11 forwarding is supported when paired with a local X server, allowing graphical applications on remote hosts to display locally through an encrypted channel.

Automation, Scripting and Integration

PuTTY’s command-line tools and session configuration enable automation for backups, deployments and remote management. PSCP and PSFTP support scripted transfers; saved-session invocation and command-line flags allow integration into batch files and scheduled tasks.

Active Development, Open Source and Trusted Distribution

PuTTY is distributed under a permissive open-source license and published on the project site with source code, changelogs and nightly builds. Official project pages provide verified downloads and mirror links to reduce risk from unofficial binaries, and the project continues to receive security fixes and feature updates.

Who Should Use PuTTY

• System administrators and network engineers who need a reliable SSH/Telnet client on Windows.
• Developers and DevOps professionals automating remote tasks and file transfers.
• Users who prefer a lightweight, portable toolset with strong key management utilities.