Compress MP4
Drop an MP4 and make it smaller: lower the resolution and pick Balanced or Smallest to fit a size limit.
Your file stays on your device. Nothing is uploaded.
Shrink an MP4 in three steps
Drop your MP4
Up to 500 MB.
Pick quality and resolution
Balanced at 720p is a good start.
Compress and download
See the new size before you save it.
The two settings that matter
Resolution changes size the most. Phones record 1080p or 4K, but most videos are watched on a phone screen where 720p looks the same. Going from 1080p to 720p cuts the pixels by more than half.
Quality controls how much detail the H.264 encoder keeps: High barely changes the look, Balanced trims what you're unlikely to notice, and Smallest is for hard limits like an email attachment.
Sound is saved as 128 kbps AAC, clear for both speech and music.
Common size limits
Discord (free)
- Limit
- 10 MB
- Try
- 480p, Smallest file
Gmail attachment
- Limit
- 25 MB
- Try
- 720p, Balanced
Slack (free workspace)
- Limit
- 1 GB, but big files are slow to send
- Try
- 720p, Balanced
| Limit | Try | |
|---|---|---|
| Discord (free) | 10 MB | 480p, Smallest file |
| Gmail attachment | 25 MB | 720p, Balanced |
| Slack (free workspace) | 1 GB, but big files are slow to send | 720p, Balanced |
Frequently
Asked Questions
How much smaller will my MP4 get?
It depends on the source. A 4K phone video compressed to 720p Balanced is often 80 to 90 percent smaller.
Will the video look worse?
At Balanced and 720p, most people can't tell on a phone. Smallest file shows some softness.
Why is it slow?
Each frame is re-encoded on your device, in the browser.
Is my file uploaded?
No. It's processed in your browser, on your own device, and never leaves it.