AVI to MP4
AVI is from another era. Convert old camcorder or DVD rips to a modern MP4.
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Why convert AVI to MP4?
AVI is a 1990s Microsoft container. It's everywhere in old video archives — camcorder dumps, DVD rips, downloaded TV episodes from before YouTube existed. It works on Windows but is a hassle elsewhere: iPhones don't play AVI, Android players need codec packs, and modern editors prefer MP4.
Converting AVI to MP4 brings your file into the modern era: smaller, plays on every device, accepted by every editor.
What's inside an AVI?
Usually MPEG-4 ASP (DivX, Xvid), Cinepak, or Indeo video with MP3 or PCM audio. We re-encode everything to H.264 + AAC for maximum compatibility.
FAQ
Will the quality be the same?
If you pick High quality, very close. Old AVI files were often already heavily compressed; re-encoding adds slight generation loss but nothing dramatic.
Does the file get uploaded anywhere?
No. Open this page, turn off your wifi, then try a file — it still works. That's the test.
What's the maximum file size?
Browser memory is the limit. WebAssembly caps at 2–4 GB per file. Most laptops handle 1080p videos under a gigabyte comfortably.
Why is it slow on my phone?
FFmpeg-WASM runs on your CPU, not hardware video encoders. Phones have less CPU, so encoding takes longer.
Can I cancel mid-encode?
Yes. The Cancel button terminates the worker immediately. You'll wait a few seconds the next time you start.