Concat

by Jareer A.AppMake video or audio

Lets you edit video on your computer, with auto-captions, voices and background removal

About Concat

A free, open-source video editor that runs on your own computer. Cut footage on a timeline, add auto-captions, voiceovers and titles, cut out backgrounds and export up to 4K, with no account or watermark.

For Short-video makersYouTube and tutorial creatorsPodcasters making clips

Made by Jareer A.

An open-source project by developer Jareer A. (GitHub account jub0t), under the AGPL-3.0-or-later license. It describes itself as a free, local-first CapCut replacement and is in beta.

Stars: ★ 13k
License: AGPL-3.0-or-later
Cost: Free
Platforms: Mac · Win · Linux
Runs: Local

Overview

Concat is a free, open-source video editor that its maker offers as a CapCut alternative, with builds for macOS, Windows, Linux and Android. You drop in footage, cut it on a multi-track timeline, add auto-captions, voiceovers, titles and effects, cut out backgrounds and export up to 4K. Captions, voices and cutouts use AI models that you download once in Settings; after that it needs no internet, and there is no account or watermark. It suits people making short videos, tutorials and podcast clips.

Captions, voices and background removal run on your own computer, so there is no account, no watermark and no subscription.

Try these first

Start with the first one: it is a small task you can check easily.

Import a one-minute clip and add auto-captions with the smallest caption model. Check the captions before exporting.First try · downloads a model
Type a short script and turn it into a voiceover with a built-in text-to-speech voice.downloads a model
Remove the background behind the person in your clip.downloads a model
Export a vertical 1080p version of your edit for Reels or Shorts.

Example prompts written by Agent Flows Hub.

Features

From the creator's documentation.

Feature	What it does	Runs
Auto-captions	Styled captions on the timeline from local Whisper models	Your computer
Voices	Text-to-speech voices, plus voice cloning from a few seconds of a recording	Your computer
Background removal	Cut out people or objects, or paint the mask yourself	Your computer
Timeline editing	Multi-track cutting, keyframes, titles and 100 effects, filters and transitions	Your computer
Export	H.264, HEVC or AV1, up to 4K at 60 frames per second	Your computer
Model downloads	Caption, voice and cutout models download once from Settings, then work offline	Internet, once

Good to know

Edit a short video on your own computer and add captions or a voiceover without an account. Concat downloads its caption, voice and cutout models once, then works offline.

Limits

Concat is in beta and its Windows and macOS builds are not code-signed. Windows SmartScreen asks you to choose Run anyway, and macOS may need the quarantine flag cleared once in Terminal.
Captions, voices and background removal need their AI models downloaded from Settings first; after that they work offline.

Notes by Agent Flows Hub (original project name: Concat), written from the creator's documentation, not from running it ourselves. Install Concat (official guide) · Concat README

Stuck setting it up?

Tell us what happened. We take a look first; if it needs paid work, you get an estimate before anything starts.

Get help

How to start

Get the appDownload it from the official page, or paste the install request into an AI agent you already use.
Open itFollow the first-run steps in the app.
Give it a first taskImport a one-minute clip, add auto-captions with the smallest caption model, and check the caption text against what is said before you export.

Steps follow the creator's instructions. The request tells your agent to read them first and wait for your OK.

Before you start

A computer with macOS, Windows or Linux.
A 64-bit computer with 4 GB of RAM; 16 GB for 4K timelines and larger caption models
Up to about 3.4 GB of free space if you download every optional AI model
On a Mac, one Terminal command the first time, because the builds are not signed
Free. Nothing to pay.

Details

Made by: Jareer A.
License: AGPL-3.0-or-later Terms
Platforms: macOS, Windows, Linux
Runs on: Your computer

View source Official docs Report a problem

For AI agents

This page as a Markdown install brief:

/en/library/concat/install.md

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