Private browser tool
Compress a video in your browser
Free, private, in-browser video compression — nothing leaves your device. Choose a quality level and create a smaller MP4 for sharing or uploading, with processing handled locally.
How video compression works here
This tool re-encodes your clip at a smaller size using ffmpeg, the standard video engine, compiled to run inside your browser. Your video is processed on your own device and never uploaded. Because video is heavy work, larger files take longer and use more memory — so it runs best on a computer rather than a phone.
When to compress a video
- Email & upload limits: get a clip under the size caps on mail and web forms.
- Faster sharing: send long recordings without a huge upload.
- Saving storage: shrink videos before backing them up.
- Posting online: meet the file-size limits of a platform or CMS.
Balancing size and quality
Lower quality settings produce smaller files with some visible loss; higher settings stay sharp but save less. If you only need part of the clip, trim it first — cutting length is the biggest size saving of all. MP4 (H.264) output is the most compatible choice for sharing.
Frequently asked questions
Is my video uploaded anywhere?
No. Compression runs entirely in your browser, so your video never leaves your device.
Will compressing reduce quality?
Some, depending on the setting. Start moderate and check the result before downloading.
How large a video can I compress?
There's no fixed limit, but very large files are bound by your device's memory — a computer handles big clips far better than a phone.
Why does it take a while?
Video encoding is intensive and runs on your own device, so longer clips take longer. Nothing is waiting on a server, though.
What format is the output?
MP4 with H.264, the most widely compatible video format.