Upload a AVI file and download a MP4. Free, no account, no watermark, and nothing is kept on our server.
Drag and drop a video file here
or
3GP · AVI · FLV · M4V · MKV · MOV · MP4 · MPEG · MPG · MTS · OGV · TS · WEBM · WMV · Maks 2 GB
Modernising old footage: same picture, a fraction of the space, and it finally plays on a phone.
AVI dates from Windows 3.1 and shows its age. It has no proper support for modern subtitles, variable frame rates or efficient codecs, so the same footage takes far more space than in MP4. It survives because some editing suites, camcorders and TV sets still expect it.
MP4 is the format the world settled on. It is a container rather than a codec, almost always holding H.264 video and AAC audio, and there is no device, browser, editor or social platform that refuses it. If you are not sure what to convert something to, the answer is MP4.
| AVI | MP4 | |
|---|---|---|
| Released | 1992 | 2003 |
| Developed by | Microsoft | MPEG |
| Type | Container | Container |
| Usual codecs | Almost anything, often old | H.264 or H.265 with AAC |
| File size | Large | Small for the quality |
| Best suited to | Old software and hardware | Everything, honestly |
| Support | Wide but dated | Universal |
The video is decoded and re-encoded, which costs a small amount of quality - invisible once, noticeable if you convert the same clip back and forth repeatedly. Resolution, frame rate and aspect ratio are preserved. Going from AVI to MP4 changes the wrapper and the codec, not the footage itself.
Video takes real time. A short clip finishes in under a minute, while a full-length film can take considerably longer, because every frame has to be decoded and encoded again. Uploading a large file is usually the slowest part of all.
Your file is uploaded to our server because the conversion runs there. A cleanup task runs every hour and deletes anything older than an hour, so nothing you upload survives more than about two hours. We do not open your files, we do not keep copies, and no account is needed to use the converter.