How to convert AVI to MP4
To convert AVI to MP4, upload your AVI file, choose MP4 as the output format and press Convert. The finished MP4 file is ready to save to your phone or computer in seconds, free, with no watermark and no sign-up. Your file is deleted from our server about 30 minutes after the conversion.
This free online converter turns AVI videos into MP4 files in your browser, with no software to install and no watermark. When the video and audio inside your AVI file can be placed in MP4 as they are, the streams are copied without re-encoding, which is faster and keeps the original quality. Otherwise the video is re-encoded as H.264 video with AAC audio.
Why convert AVI to MP4?
- Plays on virtually every phone, TV, browser and editor
- Good quality at small file sizes
- Works well for streaming and social media uploads
- Plays on: Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser
What to expect from this conversion
- Expect a smaller file than the AVI original, because MP4 compresses more efficiently.
- AVI is a legacy format, so moving to MP4 makes the video easier to play, edit and share on current devices.
- The first audio track is kept. Subtitle tracks, extra audio tracks and chapters are not included in the converted file.
AVI vs MP4
| Property | AVI | MP4 |
|---|---|---|
| Full name | Audio Video Interleave | MPEG-4 Part 14 |
| Released | 1992, Microsoft | 2001, ISO/IEC (MPEG) |
| Generation | Legacy | Modern |
| Typical file size | Large | Small |
| Plays on | Windows, VLC, many older TVs, DVD players and car media players | Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser |
| Best for | older DVD or USB players; legacy editing software | uploading to YouTube, Instagram, TikTok and WhatsApp; sharing a video that has to play everywhere |
Steps to convert AVI to MP4
- Drop your AVI video file onto the converter, or click to choose it.
- Check that MP4 is selected as the target and adjust the options if you want.
- Press Convert, then download your new MP4 file when it finishes.
Tips for the best result
- Leave Fast mode on to keep the original quality whenever the streams can be copied.
- Pick a lower resolution if the file is for a phone or messaging app.
- Use Mute if you only need the picture.
Frequently asked questions
How do I convert AVI to MP4?
Upload your AVI file, make sure MP4 is the selected target and press Convert. When the progress bar finishes, download the MP4 file. No account or software is needed.
Is the AVI to MP4 converter free?
Yes. It is free, with no watermark, no sign-up and no daily limit on how many files you convert. The site is supported by ads.
Will I lose quality when converting AVI to MP4?
Not necessarily. If the video and audio streams already fit inside MP4, they are copied without re-encoding, so quality stays identical. If the file has to be re-encoded, the High setting keeps almost all visible detail, while Small trades some detail for a smaller file.
Why is my MP4 file smaller than the AVI original?
Expect a smaller file than the AVI original, because MP4 compresses more efficiently. Choosing a lower quality or resolution reduces the size further.
Which devices can play MP4 files?
MP4 files play on Windows, macOS, Android, iOS, smart TVs, game consoles and every major browser.
How large a file can I upload?
You can upload videos up to 500 MB. Files are deleted from the server about 30 minutes after conversion.