The editor the AI actually drives.
You describe the edit, the AI performs it, and you review and correct it — on the same project, on your own machine.
Local and offline-first
Import, editing, preview, captions, reframing, and export run on your machine with bundled FFmpeg and local models in the Windows build.
Full timeline editing
Multi-track editing, trim/split/cut/reorder, transitions, fades, keyframes, text, captions, color, audio, proxy media, and export presets.
Works with MCP clients
Connect Claude Desktop, Claude Code, Cursor, Codex, Gemini CLI, Windsurf, or any MCP-compatible client via the in-app Connect AI config.
Human review loop
The AI edits the same project shown in the desktop UI, so you can inspect the timeline, preview the result, and course-correct in plain language.
Connects to any MCP-compatible client
Claude DesktopClaude CodeCursorCodexGemini CLIWindsurf
SynthCut skill
One command turns your AI into a professional video editor.
Pick your AI client, pick project or global, done in ten seconds. Works with Claude Code, Cursor, Codex, Gemini CLI, Windsurf, and any agent that reads AGENTS.md.
$npx @relo-video/synthcut addAdds the editing playbook where your agent already looks for project instructions.
Without the skill
Cuts clips
Exports the file
Leaves taste, pacing, captions, and review mostly up to you
With the SynthCut skill
Hooks viewers in the first two seconds
Trims dead air and keeps the spoken rhythm tight
Punches in on faces when attention starts to drift
Styles captions for phones
Grades skin tones instead of flattening the shot
Times graphics to the spoken words
Checks rendered frames before exporting
Four steps to
your first edit.
Download SynthCut ↓1
Install SynthCut
Download the Windows installer or portable zip and open the desktop app.
2
Connect your AI client
Click Connect AI in SynthCut, copy the generated MCP config, paste it into your AI client, then restart the client.
3
Install the skill
Run npx @relo-video/synthcut add, choose your AI client, then install the instructions project-wide or globally.
4
Ask the AI to edit
Tell the AI what to create. It can import footage, build the timeline, render previews, and export the final video.
Try this prompt
— paste it into your AI client once SynthCut is connectedyour AI client
> Import these clips, trim the silence at the start, make a vertical 9:16 highlight reel, add captions, reframe around the speaker, render a preview, and show me a timeline summary before exporting.Get SynthCut
Free and open source on every platform. Windows has a ready-to-run build; macOS and Linux run from source today, with packaged builds on the way.
🪟Ready-to-run build
Windows
Download and open — no setup required. Choose the installer, or the portable build if you'd rather not install.
Download installer (.exe)Recommended. Adds Start menu / Desktop shortcuts.
Download portable ZIPNo installer. Unzip anywhere and run
SynthCut by Relo.exe.🍎🐧Run from source
macOS & Linux
Packaged builds are on the way. For now, run SynthCut from source with Node.js and FFmpeg — the guide walks you through it in a few commands.
1Clone the repo
2Install Node.js + FFmpeg
3Run the desktop app
ⓘ
On Windows, SmartScreen may warn because the app is open-source and currently unsigned. Click “More info” then “Run anyway” if you trust the release source.