Video
Convert AVI to MP4 Online — Free
AVI is a legacy container that almost nothing modern plays natively. ReFile converts AVI to MP4 with H.264 video and AAC audio — the format every device, browser, and editor accepts.
- No signup to try
- Sandboxed processing
- Files deleted in 24 h
What this does
- Default: H.264 / AAC MP4 (universal compatibility)
- Compress old camcorder footage — 'compress this AVI under 100MB'
- Modern resolution — 'output as 720p MP4'
How it works
- 1
Upload your AVI
Drop it above, or click to pick from your device. We validate the format immediately — no spinning on a file we can't process.
- 2
Run the conversion
The recipe runs in an isolated cloud sandbox — same as every other ReFile job. No AI guessing involved; it's a hand-written command that does one thing.
- 3
Download the MP4
Result lands in seconds. Files auto-delete from our servers after 24 hours; signed download URLs expire in the same window.
Frequently asked
- Why doesn't AVI work anymore?
- AVI is a 1992 container that predates modern codecs. iPhone, Android, every browser, and most editing software either don't support it or struggle with its quirks. MP4 (2003) has effectively replaced it for everything.
- What if my AVI is from a really old camera?
- ReFile handles legacy AVI codecs (MJPEG, Xvid, DivX) automatically — it transcodes them to H.264 so the output plays anywhere.