AVI to MP4 Converter
Convert AVI files to MP4 instantly and privately. File Converts runs entirely in your browser, so your AVI is never uploaded to any server.
At a glance
- Where it runs
- Runs in your browser — your file is never uploaded.
- File size
- Up to 500 MB per file.
- Offline
Works offline after you have used it once: the engine downloads the first time and is kept. About 30 MB, once.
- Batch
- One file at a time.
- Cost
- Free, with no account and no daily limit.
AVI dates from 1992 and shows it. The container has no modern feature set, produces larger files than it needs to, and typically holds older codecs — DivX, Xvid, MPEG-4 Part 2 — that modern phones and browsers may not decode even when they open the file.
That makes this conversion different from the other container changes here. Where a MOV usually remuxes untouched, an AVI holding a legacy codec needs a genuine re-encode to H.264, which takes longer and is lossy. It is still worth doing: the result is smaller, plays everywhere, and the source was already a compressed copy of something older.
AVI files usually come from old camcorders, ripped discs and archived downloads, which is to say footage you may not have another copy of. Converting in your browser means the original never leaves your machine, and the file you started with is untouched on disk.
How to convert AVI → MP4
Drop your AVI file into the converter above — it stays on your device.
Choose MP4 as the output. File Converts picks the smartest settings automatically.
Click Convert and download your MP4 file instantly.