Convert AVI to MP4
Modernize old AVI videos into compact, streamable MP4 files.
- Your AVI file never leaves your device
- No sign-up, no watermark, no daily quota
- Handles files up to about 900 MB — your browser's memory ceiling
What happens when you convert AVI to MP4
Modernises an AVI, a container from 1992 that most current software and devices no longer handle well. The video is re-encoded to H.264 at CRF 23 and the audio to AAC at 128 kbps, usually producing a dramatically smaller file than the original DivX, Xvid or uncompressed AVI.
Good for
- Rescuing old camcorder and screen-capture footage for modern playback
- Shrinking a legacy video archive that is wasting disk space
- Getting old footage onto a phone or into a video editor
Worth knowing
- Size reductions are often large, because the codecs in old AVI files are far less efficient than H.264.
- Quality is limited by the source; a low-bitrate Xvid file will not be improved.
- Very old or unusual AVI codecs may not decode.
AVI to MP4, answered
How do I convert AVI to MP4?
Drop your AVI file into the box above (or click to browse), make sure MP4 is selected as the target format, press Convert, then download the result.
Is this AVI to MP4 converter really private?
Yes. The conversion runs entirely in your browser — your AVI file is never uploaded to any server, so nobody but you ever sees it.
Is converting AVI to MP4 free?
Completely free — no watermarks, no sign-up and no daily quota. Processing happens on your own device, so there are no server costs to pass on to you.
Can I convert multiple AVI files at once?
Yes — drop as many files as you like. Convert them individually or use "Convert all", then download everything as a single ZIP.