Compress AVI Online
Old AVI videos are huge. Re-encode them to modern H.264 MP4 and save a lot of space.
Processed in your browser and never uploaded. Works best with files up to about 500 MB. Video takes time on phones and older laptops.
Files are processed on your device and never leave it.
No upload wait, results appear right in your browser.
No sign up, no watermark and no limits.
How to use Compress AVI
Older AVI files often use outdated codecs with large sizes. Modern H.264 gives the same picture in a fraction of the size.
- Choose a quality or a target size, and a max resolution if you want it smaller.
- Click the box or drop your videos.
- Wait while the video is re-encoded to H.264 MP4 on your device. Keep the tab open.
- Download the compressed MP4.
Frequently Asked Questions
Is this Compress AVI free?
Yes. Compress AVI is completely free, with no sign up, no watermark and no daily limit.
Are my files uploaded to a server?
No. Everything runs inside your browser on your own device, so your files are never uploaded, stored or seen by anyone.
Why does it take longer than image compression?
Video and audio are re-encoded on your own device. Speed depends on your processor and the length of the file, so long videos can take several minutes.
Does it work on mobile?
Yes. It works in Chrome, Safari, Edge and Firefox on Android, iPhone, Windows and Mac.