Free Video Compressor — 100% In Your Browser
Powered by FFmpeg compiled to WebAssembly: your video never leaves your device. Choose quality, compress MP4/WebM/MOV, and download — the only major video compressor with true zero-upload.
🔒 100% Private — runs in your browser, nothing is uploaded使用方法 This Video Compressor （分步操作）
- Pick a video — MP4, WebM or MOV.
- Choose quality — CRF 28 is a great default.
- Compress & download — first run loads the engine once; processing is fully local.
FFmpeg, compiled to WebAssembly — Under the Hood
FFmpeg is the battle-tested open-source encoder behind almost every video app. Compiled to WebAssembly it runs H.264 encoding inside your browser tab — slower than a native app, but with a huge advantage: your footage is never uploaded anywhere. CRF mode trades quality for size at a constant visual level instead of a fixed bitrate.
Frequently Asked Questions
Is there a file size limit?
Only your device memory — 1-2 GB videos work on a laptop; keep phones to shorter clips.
Why is the first run slow?
It downloads the ~30 MB FFmpeg engine once (cached after). Processing itself is local CPU.
Does any video go to a server?
No. FFmpeg runs entirely in your browser — this is the only zero-upload online video compressor.
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快速摘要
Video Compressor — 100% Free, No Signup is a practical NexVaani tool for completing this task quickly in your browser. Compress MP4/WebM videos in your browser using FFmpeg WebAssembly — pick quality, see the new size, no upload to any server. Use the tool, review the result, and continue with a related NexVaani tool when your workflow needs another step.