Clapr is a small, opinionated toolbox for everyday media work — compressing a video for TikTok, turning a QuickTime .mov into an .mp4, pulling audio out of a recording, switching an .srt file into .vtt for a web player.
The difference from almost every other online tool you've used: Clapr does not upload your file. Everything runs in your browser. We use a multi-threaded build of FFmpeg compiled to WebAssembly, enabled by cross-origin isolation so that SharedArrayBuffer is available. The result is roughly native-speed processing on any modern laptop, with zero bytes crossing the wire.
Why that matters
- Privacy is architectural, not promised. We cannot leak what we never receive.
- No queue. Your compression starts the moment you drop the file in; it does not wait behind strangers' jobs.
- No watermark, no paywall on the core tools. All the in-browser tools are free forever because they don't cost us anything to run.
- Works offline once the page and the FFmpeg WASM core are cached.
What's in the box today
- Compress video (MP4 / MOV / WebM / MKV), including presets tuned for TikTok upload limits.
- Format conversion — most notably MOV to MP4.
- Extract audio to MP3 / WAV / M4A.
- Subtitle conversion — SRT ↔ VTT.
What's next
A Pro tier is in development for workloads the browser cannot do well: long-form transcription (via Whisper), files above ~4 GB, and batch pipelines. We will be explicit about which features leave your device — the in-browser tools never will.
If you want early access, email us at hello@clapr.app.
