Compress Video
Drop an MP4, MOV, WebM, MKV or AVI and get a smaller MP4. Pick how small: a lower resolution and the Balanced setting usually cut the size by more than half.
Your file stays on your device. Nothing is uploaded.
Shrink a video in three steps
Drop your video
MP4, MOV, WebM, MKV or AVI, up to 500 MB.
Pick quality and resolution
Balanced at 720p is a good start for sharing. Use High to keep more detail.
Compress and download
You'll see the new size next to the original before you save it.
What actually makes a video smaller
Two settings do most of the work. Resolution is the biggest: a 1080p frame has 2.25 times the pixels of a 720p one, and phones shoot in 4K, which has nine times as many. Most videos watched on a phone look the same at 720p.
The quality setting controls how much detail the H.264 encoder keeps. High keeps almost everything, Balanced trims detail you're unlikely to notice, and Smallest is for when the file just has to fit, like an email attachment limit.
Compression runs in your browser using ffmpeg compiled to WebAssembly, so the video isn't uploaded. It's slower than a desktop app, because a browser uses one processor core: expect a few minutes for a long video.
Common size limits
Discord (free)
- Limit
- 10 MB
- Tip
- 720p or 480p, Smallest file
Gmail attachments
- Limit
- 25 MB
- Tip
- 720p, Balanced
Outlook attachments
- Limit
- 20 MB
- Tip
- 720p, Balanced or Smallest file
| Limit | Tip | |
|---|---|---|
| Discord (free) | 10 MB | 720p or 480p, Smallest file |
| Gmail attachments | 25 MB | 720p, Balanced |
| Outlook attachments | 20 MB | 720p, Balanced or Smallest file |
Frequently
Asked Questions
How much smaller will my video get?
It depends on the source. A 4K phone video compressed to 720p Balanced is often 80 to 90 percent smaller. A video that's already compressed will shrink less.
Why is it slow?
The video is re-encoded on your own device, inside the browser, which uses a single processor core. A computer is much faster than a phone.
What format is the result?
An MP4 with H.264 video and AAC audio, which plays everywhere.
Is my video uploaded?
No. Everything happens in your browser.