Offline browser video editor

A browser editor that keeps working when your Wi-Fi doesn't. Install AetherCut as an app, go offline, and still cut and export your video.

Almost every 'online' video editor stops the moment your connection does, because the actual editing happens on their servers. AetherCut is the opposite: it's a Progressive Web App (PWA) whose editing and rendering run locally, so once it's loaded it keeps working with no internet at all.

That's possible because AetherCut never uploads your footage. Your clips are read straight into the browser, edited on your device, and exported with WebCodecs and ffmpeg.wasm — all locally. No round-trip to a server means no dependency on your connection while you work.

Install it once (Chrome/Edge → Install app) and AetherCut behaves like a native app in its own window, launchable offline. It's the editor for planes, trains, spotty hotel Wi-Fi, locked-down networks, and anywhere upload just isn't an option.

How offline editing actually works

When you first open AetherCut, a service worker caches the app shell and core assets. After that, launching it doesn't require the network — the interface, the timeline engine, and the export pipeline all live in your browser.

Editing operations (trim, split, transitions, text, crop, color, masking) never needed a server to begin with, and export runs through ffmpeg.wasm / WebCodecs on your own CPU and GPU. So a full edit-to-export workflow completes with the network unplugged.

Which features work offline — and which don't

Fully offline: the entire editor, plus on-device AI like auto-captions (Whisper via WebGPU, once the model is cached on first use) and background removal (MediaPipe). These run on your device, so they don't need a connection after the model file is cached.

Needs internet (and we say so clearly): the optional cloud-AI features — AI voiceover (ElevenLabs) and generated B-roll (Sora). These genuinely call a server, so they're labeled in the UI and simply won't run offline. Privacy Mode disables all of them with one toggle if you want a guaranteed-local session.

Why offline is a privacy feature too

An editor that can do its whole job offline is, by definition, one that isn't shipping your footage anywhere. Offline capability and 'your media never leaves your device' are the same property viewed from two angles.

For sensitive footage — client work under NDA, unreleased material, medical or legal video — being able to pull the plug and still finish the edit is a strong guarantee. You can literally disconnect, verify no traffic in DevTools, and export.

Frequently asked questions

Can I really edit video offline in a browser?

Yes. AetherCut is a PWA whose editing and export run locally on your device. After the first load caches the app, you can launch it and complete a full edit-and-export with no internet connection.

How do I install AetherCut as an offline app?

In Chrome or Edge, open AetherCut and choose 'Install app' from the address bar or menu. It then launches in its own window like a native app and works offline.

Does exporting work without internet?

Yes. Export runs through ffmpeg.wasm / WebCodecs on your own hardware, so rendering and download work fully offline.

Which features won't work offline?

Only the optional cloud-AI features — AI voiceover (ElevenLabs) and generated B-roll (Sora) — need internet, and they're clearly labeled. Everything else, including on-device captions and background removal, works offline.

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