Convert AVI to MP4
Turn your AVI file into an MP4 that plays where you need it, with nothing to install.
- Free to start
- Nothing to install
- Up to 1GB
How to convert AVI to MP4
Upload your AVI file
Drag and drop an AVI file to turn into MP4, or click to browse. Anything under 1GB, and nothing is installed.
Confirm MP4 as the output
MP4 is already selected, so there is nothing to configure. Switch to another format in the panel if AVI needs to go somewhere else.
Convert and download
We convert the AVI on our servers, usually in under a minute. Create a free account to download the MP4.
Why convert AVI to MP4?
AVI is a Microsoft container from 1992. It still turns up in old archives, camcorder dumps and downloaded footage, but it predates modern compression and has no idea what a phone is.
The practical problem: Phones, browsers and social platforms do not play AVI at all. The legacy codecs inside waste enormous amounts of space compared with H.264. No support for modern features like proper streaming, chapters or clean seeking.
MP4 solves that. Plays natively on every phone, browser, TV and editing app with no extra codecs. Every upload form accepts it, from YouTube and LinkedIn to Slack and email. H.264 keeps files small enough to send while still looking sharp at 1080p.
AVI files are almost always old: a camcorder dump, an archive disc, a download from the DivX era. The picture is what it is, but the container and codec are the reason nothing modern will open it. Converting to MP4 typically cuts the file size substantially, because H.264 needs far less data than the legacy codecs AVI carries.
Container
Typical codecs
Best for
Plays on
File size
| Feature | AVI | MP4 |
|---|---|---|
| Container | Audio Video Interleave (Microsoft) | MPEG-4 Part 14 |
| Typical codecs | DivX, Xvid, MJPEG and other legacy codecs | H.264 video, AAC audio |
| Best for | Opening archive footage from the 2000s | Sharing anywhere, uploads, web embeds |
| Plays on | Desktop players with the right codec pack | Every phone, browser, TV and editor |
| File size | Very large for the quality | Small for the quality |
AVI to MP4 questions
Is the AVI to MP4 converter free?
Yes. Convert and preview the result for free, then create a free account to download it. There is no per-file charge and no watermark on the MP4 itself beyond the free-plan badge.
Do I need to install any software?
No. The conversion runs on our servers and you use it from a browser tab, so it works the same on Windows, macOS, Linux, iPhone and Android. Nothing to install at either end. Where AVI plays: Desktop players with the right codec pack. Where the MP4 you get back plays: Every phone, browser, TV and editor.
Does converting AVI to MP4 reduce the quality?
Converting re-encodes the video, so it is not bit-for-bit identical. We encode at a high quality target, which keeps the result visually indistinguishable from the AVI on normal viewing. What changes is the container and the codec. MP4 holds: H.264 video, AAC audio. Converting the same file back and forth repeatedly will eventually show, so keep your original.
How large a file can I convert?
Anything under 1GB per upload, which is more footage in some formats than others. AVI: Very large for the quality. MP4 coming back: Small for the quality. For anything bigger, trim or compress it first, both are free tools here.
Is my file kept private?
Your upload is processed and then held only as long as your project needs it. Nothing is published, indexed or shared unless you create a share link yourself.
Other formats
Everything else you can do here.
Every conversion for a format
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Convert to WMV
Convert to 3GP
Convert to M4V
Convert to MPEG
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Convert AVI to MP4 now
Free, nothing to install, and the file stays open in a full video editor afterwards.