Video Compressor
Shrink video file size by up to 90% without leaving your browser. No upload, no watermark, no limits.
Processed on your device — nothing is uploaded
About the Video Compressor
Compress MP4, WebM, MOV and more directly on your device using FFmpeg compiled to WebAssembly. Your video is processed locally by your own browser — it is never uploaded to a server, so even huge or confidential files stay completely private.
Choose how aggressively to shrink the file: High quality keeps footage crisp for YouTube and presentations, while Tiny mode makes files small enough for email, WhatsApp and slow connections. There is no file-size cap, no daily limit, no watermark and no signup — because your browser does the work, not our servers.
How to use the Video Compressor
- 1Drag your video into the box (or click to browse).
- 2Pick a compression level — High, Balanced, Small or Tiny.
- 3Press Compress and download the result. Everything happened on your device.
Frequently asked questions
Is my video uploaded anywhere?
No. Compression runs 100% inside your browser with WebAssembly. The file never leaves your device — that is exactly why there are no size limits.
Why does the engine download about 30 MB on first use?
ToolNest loads the open-source FFmpeg engine into your browser once. It is cached afterwards, so every future compression starts instantly.
How small can my video get?
Most camera and phone footage shrinks 60–90% with almost no visible difference. Very high-bitrate 4K files shrink the most.
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