open-source project · GPL-3.0-or-later · uvnc.com

UltraVNC

Open source

Windows-native VNC.

UltraVNC is an open-source VNC server and viewer for Windows, licensed under GPL-3.0-or-later. It includes file transfer and text chat. The latest release listed in this page’s spec card is 1.8.3.0, released in September 2026.

  • Good for: personal Windows projects and home labs that need file transfer or chat, with an operator handling authentication, exposure and updates.
  • Consider RealVNC Connect when: your business depends on remote access and you need end-to-end encryption, centralized management and commercial support.

Where it is strong

  • Session extras included. File transfer and in-session text chat are part of the Windows viewer and server. UltraVNC source code.
  • In repeater Mode II, both server and viewer initiate outgoing connections to the repeater. The repeater must be accessible from both locations. UltraVNC repeater source code.
  • Single Click is a preconfigured UltraVNC server that runs without installation or registry use. UltraVNC Single Click documentation.

Where it stops

  • Windows only. Both the server and viewer are for Windows; there are no macOS or Linux builds. UltraVNC downloads.
  • UltraVNC encryption is optional through a configured DSM plugin. The server default is no DSM plugin. UltraVNC SettingsManager.cpp.

Download UltraVNC

The server runs on the computer whose screen you want to view. The viewer runs on the computer displaying that screen. UltraVNC provides both for Windows. UltraVNC downloads.

Helpdesk components

UltraVNC components

In the helpdesk pattern, Single Click runs on the end user’s computer as the server. The helpdesk uses the viewer. UltraVNC Single Click documentation describes those roles.

Read Security and remote access best practices before configuring a connection.

How it compares

Project help: UltraVNC upstream tracker or the UltraVNC Forum.

Browse the Viewers, Servers, Enterprise directories.

Using an UltraVNC setup? Read peer discussions among VNC users in VNC.com’s Using VNC Technology and Security and Remote Access groups.

Open-source VNC suits personal projects and home labs. When your business depends on remote access, RealVNC Connect adds end-to-end encryption, centralized management and commercial support from the team that created VNC.

Start a free trial ↗ See plans and pricing ↗ Download RealVNC Connect ↗

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