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Drop file here to start
Size up to 500 MB · MP4, MOV, AVI, MKV, WebM, WMV
Compression level
Max resolution
The first run downloads a ~30MB video engine (ffmpeg.wasm) to your browser — this only happens once per session. Compression speed depends on your device; a 1-minute clip can take anywhere from a few seconds to a few minutes.
How to Use This Tool — Q&A
Is my video uploaded anywhere?
No. This tool loads a real video encoder (ffmpeg, compiled to WebAssembly) directly in your browser tab, so the file never leaves your device.
Why is it slow on my phone or older laptop?
Video encoding is heavy computation. Browser-based encoding uses your CPU only (no GPU acceleration), so large or long videos take longer — try the 'Smaller file' preset or reduce resolution for faster results.
What format do I get back?
An MP4 (H.264) file, which plays everywhere — social media, phones, and most video players.
Is there a size limit?
No hard limit, but browser memory usually makes files over a few hundred MB impractical. Trim long videos first if you hit issues.