AVI is Microsoft’s video container from the 1990s. It is still found in camera archives, old downloads and screen recorders, often with DivX, Xvid or MJPEG video.
Browsers can’t read AVI, so the page loads ffmpeg (about 32 MB, once) and converts there. H.264 inside an AVI is copied and finished quickly; DivX, Xvid and MJPEG are re-encoded to H.264, which takes longer. The video never leaves your device. It is read and saved by your browser, so there is no upload, no queue and no copy on a server.
How to convert AVI to MP4
- Drop your AVI file on the box above.
- MP4 is already selected. You can pick another format if you need one.
- Press Convert to MP4 and download the new file.
Questions
Why does it download something first?
Browsers have no built-in AVI support. The converter is the open-source ffmpeg, compiled to run inside the page. It is cached after the first time.
How long does a DivX or Xvid file take?
Expect a few times the video’s length on a laptop. Short clips are quick.
Are very large AVI files OK?
Files up to about 2 GB work best on a computer.