Convert AVI to MP4
Turn your AVI files into MP4 in seconds, right in your browser. No upload, no sign-up, no watermark.
How to convert AVI to MP4
Drop your AVI
Add your file. It stays on your device.
Choose MP4
And the quality profile.
Download
Your MP4 video is ready.
Converting AVI to MP4
AVI is an older video container with large files and patchy modern support. Because MP4 is universal, converting AVI to MP4 fixes most compatibility problems: the video then plays on phones, browsers, TVs and social platforms.
The container changes, but the conversion aims to preserve the original quality as closely as possible.
Conversion runs in your browser with WebAssembly, so your video never leaves your device.
AVI vs MP4: what's the difference?
| Criterion | AVI | MP4 |
|---|---|---|
| File size | Often heavy (little compression) | Light (H.264/H.265 compression) |
| Compatibility | Old, patchy on mobile and web | Universal — phones, web, TV, social |
| Streaming playback | Poorly suited | Optimized (progressive playback) |
| Social media | Often rejected | Accepted everywhere |
MP4 delivers the same video in a lighter file that plays everywhere: it's today's go-to format to share, publish and play on mobile.
When should you convert AVI to MP4?
- Publish a video on Instagram, TikTok, YouTube or WhatsApp.
- Play it on a phone or a TV that rejects AVI.
- Shrink an old video file that's too heavy.
- Send it easily by email or chat.
Frequently asked questions
Why convert AVI to MP4?
For a video that plays everywhere, on every device and accepted by social networks.
Is AVI to MP4 conversion free?
Yes, it is free and needs no sign-up. The free tier handles up to 5 files at a time; Pro removes that limit and adds ZIP downloads.
Is the first conversion slower?
The video engine loads once (a few seconds), then stays cached for the next conversions.
Are my files private?
Yes. The conversion runs entirely in your browser; your files are never uploaded to a server.