Video editor that works offline
AetherCut is a Progressive Web App. Install it once, then edit and export without an internet connection.
Install once
Open aethercut.app in Chrome, Edge, or Safari. Click the install icon in the address bar (or use 'Add to Home Screen' on iOS / Android). The editor's service worker caches the bundle + assets locally — about 4 MB total.
What works offline
- Open the editor (loads from cache).
- Drop a local video onto the timeline.
- Cut, trim, color-grade, add transitions.
- Manual subtitles + text overlays.
- Format conversion (FFmpeg.wasm runs locally).
- Export at 4K via WebCodecs or MediaRecorder.
What needs internet
- First load (to download the bundle).
- Sign-in (Google OAuth needs a round-trip).
- Auto-captions (sends audio to Whisper).
- AI Director and AI B-roll (cloud LLM calls).
- Updates to the editor itself (refresh while online to pull the latest bundle).
Use cases that actually need offline
- Editing on a flight without paying for Wi-Fi.
- Reviewing field-recorded footage on location before uploading to your editing suite back at base.
- Working on confidential footage where the organisation requires you to be air-gapped from the public internet during editing.