Video Compressor
Shrink video files for email, uploads, and storage — processed on your own machine, never on a server.
or drop files here
Accepts MP4, MOV, WEBM, MKV, AVI, M4V · processed on your device, never uploaded
Advanced settings
Working…
Keep this tab open — the conversion runs locally on your device.
Done — ready to download
How to compress a video
- 1
Add your video
Drop in MP4, MOV, WebM, MKV, or AVI files — up to five at a time.
- 2
Choose size vs quality
Web-small for email and chat, Balanced for everyday, High quality when detail matters.
- 3
Download smaller videos
The result shows exactly how much space you saved. MP4 out, plays everywhere.
Up to 90% smaller
Smart re-encoding at Web-small settings turns bloated camera files into shareable sizes.
Private by design
Encoding uses WebAssembly on your CPU. Personal videos never leave your device.
You set the trade-off
Resolution and quality presets, plus one-click mute for clips where audio does not matter.
MP4 out, always
Results are H.264 MP4 with fast-start — playable on every phone, TV, and editor.
How does video compression work?
Video files are mostly redundant data: frames that barely change and details you never notice. Modern encoding (H.264 here) keeps the motion and drops the redundancy. Quality (CRF) sets how aggressive that is, and resolution sets how many pixels each frame carries.
- Web-small: half resolution, aggressive quality — tiny files
- Balanced: 720p with headroom for detail
- High quality: 1080p for presentations and archives
Which settings for which job?
Email attachments usually cap around 25 MB — Web-small handles most clips. Messaging apps re-compress anyway, so send Balanced. For anything you will edit later or show on a big screen, use High quality and keep 1080p.
- Email: Web-small, 480p
- Chat apps: Balanced, 720p
- Archive or edit: High quality, 1080p
Frequently asked questions
How much smaller will my video get?
Depends on the source. Phone videos and screen recordings often shrink 70–90% at Web-small. Already-compact files shrink less — the result panel shows your exact savings.
Is my video uploaded to a server?
No. The encoder runs in your browser via WebAssembly and uses your own CPU. Your video is never transmitted anywhere.
Why is compression slower than online tools claim?
Video encoding is heavy computation, and here it runs on your machine honestly rather than on a server queue. The upside: no uploads, no waiting rooms, no size limits beyond your patience.
What does the mute option do?
It strips the audio track entirely. Useful for silent clips — you save the space audio was taking.
Why does the first conversion take longer?
The encoding engine (about 30 MB) downloads once and is cached for the rest of your session. Later conversions skip the wait.
Want every tool, with zero uploads?
FreeConvert runs entirely in your browser. Pick a file, get a result — nothing ever leaves your device.
Start converting