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jub0t/Concat

Beta: The truly free, open-source, local-first, cross-platform video editor. Scriptable through a JSON-RPC API & MCP.

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README.md

<h1 align="center">Concat</h1>
<h3 align="center">The free, open-source, cross-platform video editor.</h3>

**🇬🇧 English** · [🇩🇪 Deutsch](docs/README.de.md) · [🇪🇸 Español](docs/README.es.md) · [🇫🇷 Français](docs/README.fr.md) · [🇮🇹 Italiano](docs/README.it.md) · [🇳🇱 Nederlands](docs/README.nl.md) · [🇵🇱 Polski](docs/README.pl.md) · [🇧🇷 Português (Brasil)](docs/README.pt-BR.md) · [🇷🇺 Русский](docs/README.ru.md) · [🇺🇦 Українська](docs/README.uk.md) · [🇹🇷 Türkçe](docs/README.tr.md) · [🇦🇿 Azərbaycanca](docs/README.az.md) · [🇭🇷 Hrvatski](docs/README.hr.md) · [🇮🇩 Bahasa Indonesia](docs/README.id.md) · [🇻🇳 Tiếng Việt](docs/README.vi.md) · [🇹🇭 ไทย](docs/README.th.md) · [🇯🇵 日本語](docs/README.ja.md) · [🇰🇷 한국어](docs/README.ko.md) · [🇨🇳 简体中文](docs/README.zh-Hans.md) · [🇹🇼 繁體中文](docs/README.zh-TW.md) · [🇸🇦 العربية](docs/README.ar.md) · [🇮🇱 עברית](docs/README.he.md) · [🇮🇷 فارسی](docs/README.fa.md) · [🇮🇳 हिन्दी](docs/README.hi.md) · [🇵🇰 اردو](docs/README.ur.md) · [🇧🇩 বাংলা](docs/README.bn.md)

## Paid Sponsors

<table width="100%">
  <tr>
    <td align="center">
      <a href="https://proxyon.io/?ref=concat"><img src="https://cdn.jsdelivr.net/gh/jub0t/Concat@main/assets/proxyon_sponsor_logo.png" alt="Proxyon" width="80" /></a><br />
      <a href="https://proxyon.io/?ref=concat"><b>Proxyon</b></a><br />
      <sub>Pay-as-you-go proxies for developers<br />Use code <code>JUB0T</code> for 20% off</sub>
    </td>
      <td align="center">
      <a href="https://www.patreon.com/cw/jub0t"><b>Support Concat</b></a><br />
      <sub>Concat needs your donations to continue development,<br/>we have come too far to back down now 😢</sub>
    </td>
  </tr>
</table>

</div>

## About

Concat is a free, open-source video editor for macOS, Windows, Linux and Android. It covers what most edits need: auto-captions, text-to-speech, background removal, keyframe animation, effects and titles, multi-track cutting, 4K export. With none of the catches: no watermark, no account, no subscription, no upload.

Everything runs on your machine. Install it, drop in footage, cut. The AI models for captions, voices and cutout download once from Settings and work offline after that. Your footage never leaves your disk.

**Good for:** TikTok, Reels and Shorts, YouTube videos, tutorials and screen recordings, podcast clips, memes.

**Also for machines:** a built-in MCP server for AI agents (`concat --mcp`, [set up](docs/MCP.md)) and a JSON-RPC API for scripts, so they can cut video with it too.

## Highlights

- 🚫 **No watermarks. No account. No paywall.** Ever.
- 🔒 **100% local.** Nothing uploads. Works offline.
- 💬 **Auto-captions.** Made on your machine. Pick a model size, get styled captions on the timeline.
- 🗣️ **Text-to-speech + voice cloning.** A free local voice on the desktop, or any voice from a few seconds of a recording. Phones are getting their own system voice.
- 🧍 **Background removal.** People, objects, or paint the mask yourself.
- 🎞️ **Keyframes.** Position, scale, rotation, opacity, volume, effect parameters. Curve editor built in.
- ✨ **100 effects, filters and transitions.** Live in the preview.
- ✂️ **Cut fast.** Split, trim, ripple, merge, freeze frame, speed. Magnetic timeline if you want it.
- 🎚️ **Multi-track, multi-timeline.** Overlays and picture-in-picture: stack video, stills and titles on as many tracks as you like. Several cuts in one project. Blend modes (screen, add, multiply…), crop, flips.
- 📝 **Titles.** Fonts, stroke, shadow, background plate. Presets to start from.
- 🎙️ **One-switch voice cleanup.** Denoise, enhance voice, level the loudness. Plus chipmunk, robot, telephone and friends.
- 📤 **Export.** H.264, HEVC, AV1. Up to 4K 60, 10-bit colour.
- ⚡ **Fast.** Proxies built in, so 4K scrubs smoothly.
- 🤖 **Scriptable.** An MCP server built in, so Claude and other AI agents can edit with it ([one line to set up](docs/MCP.md)), and a JSON-RPC API for scripts. A build from source adds gRPC and a command-line tool.
- 🖥️ **macOS, Windows, Linux, Android.** 26 languages. Same app, same project files.

## Download

Two ways in:

1. **[The website](https://concat.standalones.org/#download)** hands you the right build for your machine. Start here.
2. **[GitHub Releases](https://github.com/jub0t/Concat/releases)** has every build for every platform, with installers, packages and checksums. For when you want to pick.

Concat is in **beta**: it works, and it still has edges. [Say so](https://github.com/jub0t/Concat/issues) when you find one.

**Platforms**

- ✅ **Windows** · x86_64 (ARM builds are paused, see [#326](https://github.com/jub0t/Concat/issues/326)). A setup and an `.msi`. If SmartScreen stops an unsigned build: **More info** › **Run anyway**
- ✅ **macOS** · Intel and Apple silicon. If macOS refuses to open an unsigned build: `xattr -dr com.apple.quarantine /Applications/Concat.app`
- ✅ **Linux** · x86_64 and ARM. `.deb`, `.rpm`, `.AppImage` and an Arch package. Also a Flatpak on **[Flatpark](https://flatpark.org/apps/app.concat.editor/)**, a community Flatpak remote that wraps the x86_64 `.deb` of each release and updates with it
- ✅ **Android** · phones and tablets
- ✅ **iOS / iPadOS** · iPhone and iPad, sideloaded

✅ Supported · 🚧 Work in progress · 🧪 To be tested

**System requirements** and the optional model sizes are on [the website](https://concat.standalones.org/guides/system-requirements).

**[Code signing policy](CODE_SIGNING.md)**: why the Windows builds are not signed yet, and what Concat sends over the network (nothing you did not ask for).

## Build from source

You need Rust 1.93 or newer (see `rust-version` in `src/Cargo.toml`), the FFmpeg 7+ development libraries, cmake and a C++ compiler.

- **macOS:** `brew install ffmpeg`
- **Windows:** from [FFmpeg's Windows downloads](https://ffmpeg.org/download.html#build-windows), take BtbN's `win64-gpl-shared` build (the one CI uses), unpack it and point `FFMPEG_DIR` at it
- **Linux:** use your distro's FFmpeg if it is version 7 or newer, otherwise use a BtbN `shared` build with `FFMPEG_DIR` like on Windows

Then:

```sh
cd src
cargo run -p concat          # the editor window
```

Other useful commands:

```sh
cargo build --profile app -p concat   # the shipping binary (fat LTO, stripped)
cargo test                            # run the test suite
cargo fmt --check && cargo clippy --all-targets -- -D warnings   # what CI checks
```

If you change text the interface shows, run `python3 scripts/locales.py` from the repo root so the string inventory stays in sync. Full details live in [CONTRIBUTING.md](CONTRIBUTING.md).

## How to Contribute

> [!IMPORTANT]
> The best way to contribute is to grab a build from the [Releases](https://github.com/jub0t/Concat/releases) page and use it: find where it breaks, and say where it could be better.
>
> Ready to write code? [CONTRIBUTING.md](./CONTRIBUTING.md) covers setup, the layout of the tree, the checks to run, and how contributions are licensed. Driving Concat from a script, a service or an agent? [The developer docs](https://concat.standalones.org/docs) cover the Concat API and its transports: JSON-RPC and gRPC; [docs/MCP.md](docs/MCP.md) connects an AI agent over MCP. [This Discussion](https://github.com/jub0t/Concat/discussions/3) is where the project was announced.
> 
> Contributors can claim a `@Contributor` role in the Discord server: just ask.

## Star History

## Contributors

## Licence

Concat is free software under [AGPL-3.0-or-later](LICENSE). A commercial licence is available for closed-source use; see [LICENSING.md](LICENSING.md).

## DMCA

If you believe something in this repository, its releases, or a package or model it distributes infringes your copyright, email [jub0trd@gmail.com](mailto:jub0trd@gmail.com) with a description of the work you own, a link to where the infringing material appears here, your contact details, a statement that you believe in good faith the use is not authorised by you, your agent, or the law, and a statement, under penalty of perjury, that the notice is accurate and that you are the owner or authorised to act for the owner, signed with your physical or electronic signature; valid notices are acted on promptly, and anyone whose material is removed may send a counter-notice to the same address.