AVI to MP4 Converter
Convert AVI to MP4 for free, right in your browser – no sign-up and no upload to a server.
Drop your file here
or click to browse
Supported formats: AVI · Max size: 500 MB
Your file stays on your device – it is never uploaded. Only convert files you own or have the right to use.
AVI is an old format that many modern phones and TVs do not support. Convert AVI to MP4 for a smaller, compatible video.
Old AVI files with rare codecs can be slower to convert.
How to convert AVI to MP4
Choose a file
Drop your AVI file into the box or click “Choose file”.
Click “Convert”
Conversion runs in your browser, so the file is never sent anywhere.
Download the result
You get a ready MP4 file – download it with one click.
AVI vs MP4: comparison
| Property | AVI | MP4 |
|---|---|---|
| Compression | Lossy or uncompressed | Lossy (H.264 / AAC) |
| Quality | Depends on the codec | Very good |
| File size | Large | Small to medium |
| Compatibility | Legacy format; modern phones often cannot play it | Plays everywhere – phones, TVs, browsers, social networks |
| Best for | Old video archives, DVD rips | Web video, social networks, sharing |
Why convert to MP4
- Best compatibility
- Efficient compression
- Accepted by every platform
Good to know about MP4
- Not as open as WebM
What is AVI?
An older Microsoft video format. Old video archives, DVD rips.
What is MP4 (H.264)?
The most universal video format. Web video, social networks, sharing.
When to choose AVI to MP4
AVI is an old format, common in family video archives, cameras and photo programs from the 2000s. Modern phones, TVs and social networks often do not support it, while MP4 plays almost everywhere.
Common problems and fixes
- An AVI can contain very varied codecs (for example DivX, Xvid, MJPEG). If one is unsupported, conversion will fail or there will be no audio.
- Old files are low resolution, so upscaling will not look better – do not choose a higher resolution than the original.
- Uncompressed AVI can be huge; files over 500 MB are not accepted.
- If picture and sound do not match, try another quality preset.
Quality tips
It is worth saving old home videos as MP4 while you still have a working way to play them. Keep the original too.