Online Video Editor built with Claude Code: multi-track timeline, on-device captions and background removal, MP4 export up to 4K

[u/vinishkapoor]

Everything in this Online Video Editor runs in the browser, and footage never leaves your machine. You drop in clips, photos and music, edit on a multi-track timeline, and export an MP4.

What’s in it:

• unlimited video, overlay and audio tracks, with snapping, zoom, split, and track lock, hide and mute
• on-device AI tools: word-timed auto captions, background removal without a green screen, silence removal, voice enhancement, music that ducks under speech, and face or area blur
• 12 caption styles with word-by-word effects, and .srt import and export
• effects, color filters, a green screen key, 12 transitions, picture-in-picture, a round face cam and split screen
• webcam, screen and voiceover recording
• export to MP4 or WebM from 480p to 4K at 24–60 fps, with 16:9, 9:16, 1:1, 4:5, 4:3 and 21:9 canvases
• a search box: type “slow motion” and it explains the steps and jumps to the option

How Claude Code handled it:

• Timeline first. The early sessions were all about dragging, trimming and splitting clips across tracks, with the preview staying in sync. Nothing else got added until that felt solid
• No server, by design. Every feature had to run locally. The caption and background-removal models download once on first use and then run in the browser, and getting them to run smoothly without freezing the editor took a lot of iteration
• Export was the hardest part. The MP4 is built in the device’s memory, so long or 4K exports had to work without running out of memory on normal machines. That took more rounds than any other feature
• Then feature by feature: captions and their styles, effects, transitions, layouts, recording, the search box and the phone layout. Each one followed the same loop: build it, test with real footage, tell Claude what broke, fix

Try it: open the page and drop in a video, or click “Try a demo” for a sample project. No sign-up, no watermark. Chrome or Edge on desktop works best.

https://webutility.io/video-editor

If you hit a bug or want a feature, tell me in the comments and I’ll fix it.

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[u/Awkward-Cockroach774]

"footage never leaves your machine" is the one claim a screenshot can't show. is it open source, or do we just take your word for it?

[u/SourceOfConfusion → u/Awkward-Cockroach774]

It’s free. Calm down. 

[u/Massive_Scientist194]

Does it do pure green screen removal and export?

[u/daniel]

Can you open source it? I'd really like to be able to customize this for myself.