Convert AVI to MP4 Online
AVI files are a classic Microsoft container from 1992 that still plays on many older players and DVD hardware. Converting to MP4 gives you streaming, social media, mobile playback, archiving everyday video.
How to convert AVI to MP4
- Upload your AVI file. Drag it onto the box above or click to browse. Files up to 200 MB are accepted.
- Choose MP4 as the output. The target format is pre-selected on this page — just press “Convert now”.
- Download the result. Conversion runs on our own server and the download starts as soon as it is ready. Your files are deleted automatically.
Why convert AVI to MP4?
AVI is a classic Microsoft container from 1992 that still plays on many older players and DVD hardware. MP4 is the universal video container, playable on virtually every device, browser, phone and smart TV. That difference is exactly why converting between them is so common: MP4 is the better choice for streaming, social media, mobile playback, archiving everyday video.
AVI vs MP4: key differences
| AVI | MP4 | |
|---|---|---|
| File type | legacy container | lossy container |
| Typical use | legacy playback, older Windows software, hardware players | streaming, social media, mobile playback, archiving everyday video |
| Compatibility | Broad legacy support, but inefficient compression and no modern codec features. | Near-universal support. Typically pairs H.264/H.265 video with AAC audio. |
Tips for a clean AVI to MP4 conversion
- Broad legacy support, but inefficient compression and no modern codec features.
- Use the highest-quality source AVI you have — converting a compressed file again cannot restore lost detail.
- If you only need a smaller file, try a lower resolution or bitrate instead of a different format.
- Keep the original AVI until you have checked the converted MP4 opens the way you expect.
Frequently asked questions
How do I convert AVI to MP4?
Upload your AVI file to the converter on this page, make sure MP4 is selected as the output format and click “Convert now”. When the conversion finishes the download starts automatically.
Is this AVI to MP4 converter free?
Yes — it is completely free and needs no account. Files up to 200 MB are accepted, and heavy use is rate-limited so the service stays available for everyone.
Will converting AVI to MP4 reduce quality?
MP4 uses lossy compression, so the converted file is re-encoded. Quality loss is minimal at sensible settings, but keep the original AVI if you may need to convert again later.
What is a AVI file?
AVI is a classic Microsoft container from 1992 that still plays on many older players and DVD hardware. Its technical name is Audio Video Interleave and it is typically used for legacy playback, older Windows software, hardware players.
What is a MP4 file?
MP4 is the universal video container, playable on virtually every device, browser, phone and smart TV. Its technical name is MPEG-4 Part 14 and it is typically used for streaming, social media, mobile playback, archiving everyday video.
Can I convert AVI to MP4 on my phone?
Yes. The converter runs in the browser on Android, iOS, Windows, macOS and Linux — no app installation is required.
Are my files kept on the server?
No. Uploaded files and converted results are deleted automatically a short time after the conversion finishes.