AVI, Windows’ classic video
AVI is a 1990s Microsoft video format, common in old cameras and old files.
Strengths: Classic desktop players open it.
Limits: Browsers and phones do not play it, and it is usually large; here it is read with ffmpeg.
Video
Convert AVI to MP4
Turn your AVI files into MP4 in seconds. Everything happens in your browser: nothing is uploaded to any server.
AVIMP4
Drag your files here
Or paste them with Ctrl+V. They never leave your device.
Why convert AVI to MP4?
Browsers and phones do not play it, and it is usually large; here it is read with ffmpeg. As MP4 (H.264) it plays on any phone, TV, browser or social network.
About the formats
MP4, the universal video
MP4 is the most widespread video container; here it comes out with H.264 video and AAC audio, the most compatible combination.
Strengths: It plays on any phone, TV, browser or social network without installing anything.
Limits: At equal quality it takes slightly more space than a WebM with VP9.
How to convert AVI to MP4
- 1Drop your AVI files in the box, paste them or pick them from your device.
- 2Check that the target is MP4 and open the options if you want to adjust it.
- 3Press “Convert” and download each MP4, or all of them in a ZIP.
Frequently asked questions
Is my AVI uploaded to a server to turn it into MP4?
No. The AVI to MP4 conversion runs entirely in your browser, with code downloaded from this site and executed on your device. You can check it in the Network tab of the developer tools or by going offline after the page loads.
How long does AVI to MP4 take?
It depends on the length, the resolution and your computer. The browser’s hardware acceleration is used when available, and you get an estimate before it starts.
Is there a size limit?
Up to 2 GB and 3 hours of video on desktop; on mobile, 500 MB and 30 minutes (AVI: 1 GB and 1 hour on desktop). If it is over, you are told before it starts and can trim it.
Can I convert several AVI files at once?
Yes. Drop as many AVI files as you like: several are converted at the same time, depending on your processor cores, and when they finish you can download each MP4 or all of them in a ZIP.