Convert AVI to MP4 online
Convert a AVI file to MP4 directly in your browser — the file is never uploaded to a server.
or click to select it
Convert an old AVI video to MP4, a format far more compatible with phones, smart TVs and social media, directly in your browser.
AVI is a 1990s Microsoft container that can hold very different codecs inside (Xvid, DivX, MPEG-4, and even H.264 in more recent files). The tool decodes the video with whatever codec the file uses and re-encodes it as H.264/AAC inside a modern MP4 container.
Use cases
- Bring old videos saved as AVI back to life on a modern phone or smart TV.
- Convert recordings from old cameras or capture devices into a shareable format.
- Prepare an AVI video for a platform that doesn't support that container.
How it works
- 1
Upload your AVI video
Drop the file in or select it from your device.
- 2
Choose the quality
High, balanced or small file; resolution and FPS in advanced options.
- 3
Download the MP4
Compatible with virtually any modern device.
Technical details
Uses ffmpeg.wasm with support for the most common video codecs found inside AVI files (Xvid/DivX-style MPEG-4 ASP, MS-MPEG4, and Motion JPEG, plus H.264). AVI is an old format with very varied implementations — if your file uses an uncommon codec, the conversion may fail, and you'll get a specific error if it does.
Frequently asked questions
Can every AVI file be converted?
The vast majority of common AVI codecs (Xvid, DivX, MPEG-4, H.264) are supported, but since AVI is such an old and varied format, some very specific or uncommon codec might not be.
Why convert from AVI to MP4?
AVI barely plays natively on phones, smart TVs or modern browsers; MP4 with H.264 is today's most compatible standard.