Video Compressor

Re-encode a video with FFmpeg compiled to WebAssembly, producing several quality variants to compare and download.

Artifact by Simon Willison

IndexedApache-2.0Audio & videoNo sign-upRuns in your browser

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Opens tools.simonwillison.net in a new tab. Nothing to install.

Open Video Compressor Source code

You provide: A video file
You get: Compressed video variants with sizes
Account: No sign-up needed
AI: No AI: a plain tool
Your input: Processed in your browser, not uploaded (stated by the tool or its repo)
Price: Free to use
Made with: AI-built app
Source: Open source
Link check: Answered on Nov 1, 2026

About

Video Compressor is an AI-built single-page app in the audio video category (video compression). It opens in your browser, so there is nothing to install. You provide A video file and get compressed video variants with sizes. Your input is processed on your device and not uploaded. It needs no account. It is a plain tool: no AI model is involved. The source code is public on GitHub (simonw/tools).

Category: Audio & video · video compression

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Details

Auth: No auth
License: Apache-2.0
Repository: github.com/simonw/tools
Website: tools.simonwillison.net/video-compressor
First seen: Oct 31, 2026
Last checked: Nov 1, 2026
Source: GitHub

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Cite this page

Video Compressor: free online. Agent Mart. https://agentmart.dev/artifacts/video-compressor (last updated 2026-11-01)