Free tool
Free AVI to MP4 converter, no upload
Convert AVI to MP4 in your browser.
Your video
Drag a file here, paste it, or choose one.
.avi, .mp4, .mov, .m4v, .mkv, .webm, .wmv, .flv, .3gp, .gif. Up to 500 MB.
Up to 10 minutes long.
Your video never leaves your browser. The conversion runs on this machine.
More options
Result
Worked example
Measured on our own 16 second Xvid AVI at 640 by 360 with MP3 audio, converted to MP4 at Balanced.
Source AVI
1.6 MB
MP4, H.264 and MP3
456 KB
The video was re-encoded to H.264 and the MP3 audio went across untouched, which MP4 allows. The file is less than a third of the size and now plays in the browser.
1. Add the AVI. 2. Pick the quality. 3. Convert locally. 4. Download the MP4.
What Interlace does
Old footage, new video, same message.
- Paste the script from the old video, or upload the document behind it
- Interlace draws fresh scenes in a style you pick
- Your logo, colours and fonts on every scene
Real Interlace output, unedited. Shown silent and sped up.
Your file
toner-training.avi
Xvid, 640×360
Questions
Asked and answered
No. The file is opened by the page and converted by ffmpeg compiled to WebAssembly, on your own machine. There is no upload step, and closing the tab discards everything.
Browsers never added AVI support, so the page cannot show it before converting. ffmpeg reads it fine. The MP4 you get back plays right on the page.
AVI is only a container. Files from the 2000s usually hold MPEG-4 Part 2 video (Xvid or DivX) with MP3 audio. Camera clips often hold Motion JPEG, which is very large. A few hold H.264. The page reads the file first and tells you which it found.
Usually, because H.264 is far more efficient than Xvid or Motion JPEG. How much smaller depends on what is inside; the worked example on this page shows one real file.
Yes. The MP4 to AVI page writes Xvid style AVI files for older TVs and DVD players.
500 MB and 10 minutes. Everything runs inside one browser tab, which has a fixed memory budget, and the encoder runs on a single thread. A rewrap takes seconds; a full re-encode runs at about real time for 720p and several times the clip length for 1080p. For anything bigger, a desktop encoder such as HandBrake is the better tool.
Turn this into a video
Create an account and start from a document, script, or prompt.