Free Video Compressor
Compress MP4, MOV, WebM, and MKV in your browser with FFmpeg.wasm. H.264 + AAC output, three smart presets, files never uploaded.
Need batch encoding for 100+ videos?
Paid CyberStock plans include server-side video encoding for production batches, plus stock-grade titles, keywords, and CSV exports.
Video compressor FAQ
Is the video compressor really free?
Yes. Compression runs locally with FFmpeg compiled to WebAssembly. Up to 3 videos per session in the free tool.
Are my videos uploaded?
No. Videos never leave your browser. Encoding happens on your CPU using FFmpeg.wasm.
Which formats work?
Input: MP4, MOV, WebM, MKV, AVI. Output: H.264 / AAC in MP4 (the most compatible format for web, social, and editors).
How long does it take?
Single-threaded FFmpeg.wasm runs roughly 0.3-0.7x realtime on a modern laptop. A 30-second 1080p clip typically finishes in 1-2 minutes.
What size limit?
Up to 500 MB per file in the free tool. Logged-in users on paid plans can run larger production batches with server-side encoding.
Which preset should I pick?
High = best fidelity. Balanced = recommended for most uploads. Small = aggressive size reduction for chat/email.