Convert AVI to MP4
Modernize old AVI footage into MP4s that play on today's devices — converted privately on yours.
AVI is the format of an earlier era — camcorder archives, ripped DVDs, and clips from the 2000s. Modern phones and smart TVs frequently refuse to play it, and its aging codecs (DivX, Xvid, MJPEG) are dropping out of software support entirely. MP4 with H.264 is the format everything made this decade understands.
This converter decodes whatever your AVI contains and re-encodes it as a clean, modern MP4 — right in your browser, with nothing uploaded. It's a good way to rescue old family footage into a format that will keep playing for the next twenty years.
How to avi to mp4 online
- 1Drop your .avi file into the box above.
- 2Choose a quality level — High preserves old footage faithfully.
- 3Click Convert to MP4 and wait for processing to finish.
- 4Download your modernized MP4.
Frequently asked questions
Why won't my AVI file play anymore?
AVI files typically contain older codecs like DivX or Xvid that modern devices and apps no longer bundle decoders for. The file isn't corrupt — the world just moved on. Converting to H.264 MP4 fixes it permanently.
Will converting improve the quality of old footage?
Conversion preserves the original quality but can't add detail that was never there — old 480p footage stays 480p. The High setting ensures nothing further is lost in the conversion.
My AVI is several gigabytes — will this work?
Files up to around 2 GB work well in modern desktop browsers. Larger archives are better split or converted in pieces — our trim tool can cut a large file into parts first.
Is my video uploaded during conversion?
No. Everything runs locally in your browser via WebAssembly — old family footage stays private on your device.
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