Convert AVI to MP4
100% private — runs on your device, never uploaded. Works offline once loaded.
AVI dates from 1992 and it shows: no support for modern streaming, no fast-start for the web, and video inside it that is usually DivX, Xvid or MPEG-4 Part 2 rather than anything a phone made this decade wants to decode. It is the format old camcorder tapes, early screen recorders and long-forgotten downloads come in. Converting to MP4 re-encodes the picture to H.264, which every device and platform accepts, and adds the fast-start flag so the file can begin playing before it has finished downloading. Because the source codecs are old and inefficient, the MP4 is frequently smaller than the AVI it came from while looking the same.
Frequently asked questions
Will the MP4 be smaller than the AVI?
Usually yes. The codecs inside an AVI are old and inefficient, so H.264 generally stores the same picture in fewer bytes.
Does converting lose quality?
One generation, as with any re-encode. Choose High quality when the source is worth it; the difference is not visible in normal viewing.
Is my file uploaded?
No — the conversion happens in your browser and the AVI never leaves your device.
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