Synergy 3

v3.8.3 (October 14, 2026)

Bug fixes

• Stopped the cursor on a Mac primary moving with the mouse while another computer had control, by going back to how 3.6.3 handled it. The problem started in 3.7.1, and the fix in 3.8.2 didn't cover every case. Where macOS won't hide the cursor, it now stays still in the middle of the screen.
• Stopped the Core crashing on Windows every time it stopped.
• A screen can now be dragged above or to the left of the others in the screen layout.
• Stopped a dragged screen jumping away from the pointer in the screen layout.

v3.8.2 (October 12, 2026)

Security

• Linux service: The service binary was installed writable by every user, so any local user could replace the program that runs at each login.
• Logs: The account email, password and full serial key were written to the log in plain text, and diagnostic bundles included any already there.
• Third-party components: Bundled components had published security advisories, and have been updated to clear them.

Features

• Synergy 3 is now offered for Fedora 45, CachyOS, Linux Mint 22, Pop!_OS 24.04 and Enterprise Linux 10, and as arm64 packages for Linux, including Raspberry Pi OS.

Enhancements

• When the Core can't start or stops unexpectedly, a dialog now says so and shows its last error, and Core warnings and errors keep their level in the log window.
• A new computer now appears on the screen layout right beside the primary, and the layout stays centered in the editor at any window size.
• The setup tutorial now explains that the cursor only crosses between screen edges that touch.

Bug fixes

macOS

• Stopped the cursor on a Mac primary staying visible over the Dock after moving to another computer.

Linux

• The rpm now installs on Enterprise Linux 10, such as Rocky Linux and AlmaLinux, without needing EPEL.
• The rpm now installs on openSUSE Leap 16, where it couldn't find Qt 6.
• The Flatpak installs again, now that it uses a supported KDE runtime.

All computers

• Stopped a new computer replacing the screen layout and shared settings on every other computer with its own empty ones.
• After a computer is reset, the primary now asks to verify it again, so both computers show a code to compare.
• Stopped the GUI switching between paused and running every second when the Core couldn't start.
• Stopped a dragged screen sticking to the cursor after the mouse button was released in the screen layout.
• Stopped the computer menu being cut off in the screen layout, page buttons touching the window's edge, and the rejected computer banner running past the editor.

v3.8.1-beta (October 4, 2026)

Bug fixes

Windows

• Restored AltGr on Windows clients, so keyboard layouts that need it type symbols such as @, { and } again. This also covers AltGr typed on a Linux server reaching a Windows client whose screen maps AltGr to Alt.

v3.8.0-beta (September 29, 2026)

Features

• Copy and paste now shares up to 128 MB by default, with a new size limit setting that replaces the old 4 MB limit.
• The sidebar shows when a clipboard is being sent or received, and warns when one is over the size limit.
• A "Switch to next computer" hotkey action moves to the next connected computer, in alphabetical order.
• You can lock the cursor to the primary computer at startup, until you press Scroll Lock or your lock hotkey.
• Modifier keys can be turned off or mapped to Alt Gr, and each computer can set Alt Gr for itself.
• Horizontal scrolling can be inverted, and each computer has its own vertical and horizontal scroll speed.
• A computer can slow down its reconnection attempts when the primary has been away for a while.
• Search the log window, with each match highlighted as you step through them.
• Export the generated config to a file from Local settings.
• Use your own TLS certificate, or regenerate this computer's certificate.
• On Windows, the Core can run without the background service.
• Update checks can be turned off in Local settings.

Enhancements

• Images are now sent in the format they were copied in, instead of as uncompressed bitmaps, so more apps can paste them and large screenshots and photos fit well within the limit.
• Animated GIFs, SVG images, RTF rich text, WebP and TIFF images are now shared as they are, instead of being converted or left out.
• Large clipboards no longer hold up the mouse: a clipboard is now sent in small pieces behind your keyboard and mouse input, once the mouse comes to rest on the other computer.
• Clipboard sharing on Wayland now includes formatted text and JPEG, BMP, TIFF and WebP images.
• A computer now says when the primary refuses it because another computer with the same name is connected.
• A computer now warns when the primary uses a keyboard layout it doesn't have.
• The trust prompt shows both fingerprints in one box to compare, under "Show fingerprints (advanced)".
• The log level list now offers Info and Debug, with the numbered debug levels merged into them.
• Tooltips appear as soon as the pointer is over them.
• An external config file is now set up per computer from Local settings, with a warning first, instead of switching every computer at once.
• A computer keeps applying its settings when another computer uses a hotkey action it doesn't know yet.
• Settings that don't apply are greyed out instead of disappearing, and a switch that did nothing has been removed.

Bug fixes

Windows

• Stopped a large copy freezing the keyboard and mouse until the copying app had finished preparing its data.
• Stopped a Windows client disconnecting partway through a large clipboard sent over TLS.
• Corrected clipboard detection on a Windows client so every copy is shared, not only the first one after it receives a clipboard.
• Restored sharing of images that apps copy only as PNG, JPEG or other image files.

macOS

• Restored sharing of images copied on a Mac, and images sent to a Mac are now written as PNG, JPEG and TIFF so Mac apps can paste them.
• Stopped text shared to a Mac getting old-style carriage-return line breaks.
• Stopped a copy made just before moving off a Mac being missed.
• Stopped copying a list of files or links on a Mac hanging the clipboard read.

Linux and Wayland

• Corrected pasting on a Wayland server so a copy made on another computer pastes, instead of the old clipboard.
• Stopped a Wayland server re-sending an unchanged clipboard on every switch and emptying the other computers' clipboards.
• Stopped pastes on a Wayland server stalling while it offered clipboard formats it no longer had.
• Restored pasting large images into Qt apps on Wayland, and sharing large images copied from them.
• Restored image copy and paste on X11 with apps that use PNG or JPEG.

All computers

• Stopped a client dropping a healthy connection while receiving a large clipboard.
• Stopped every copy on a Mac or Windows computer being sent twice.
• Restored timing below a second, so settings such as the switch delay take effect as set.
• Local settings and Troubleshooting now use the full window height instead of scrolling in a small box.