Convert MP4 to AVI
Convert MP4 files to AVI entirely in your browser — no upload, no account, no watermark.
Your file never leaves your device — conversion runs entirely in this browser tab.
To convert MP4 to AVI, open the AVI converter and drop your MP4 file in. The conversion runs entirely inside your browser using WebAssembly, so the file is never uploaded. Almost always a compatibility fix for legacy software or hardware that predates MP4.
What to expect from this conversion
Almost always a compatibility fix for legacy software or hardware that predates MP4. AVI is markedly less efficient, so expect the file to grow. Do this only when something genuinely requires it.
The universal container, normally holding H.264 and AAC. Plays essentially everywhere.
Lossy · video
A 1992 Microsoft container. Still turns up in archives and old camera output, but lacks modern features and is inefficient by current standards.
Lossy · video
Both MP4 and AVI discard data to save space, so this conversion compresses something that has already been compressed. Always convert from your original file rather than from an earlier conversion — the losses compound.
How to do it
- Open the AVI converter
Go to the AVI converter and drop your MP4 file onto it, or click to browse.
- Convert
Press Convert. FFmpeg runs in your browser and shows real progress as it works.
- Download
Download the finished AVI file. It is created in your browser and never sent anywhere.
Common questions
How do I convert MP4 to AVI?
Open the AVI converter, drop your MP4 file onto it and press Convert. Everything runs in your browser — the file is not uploaded. Desktop browsers handle files up to about 200MB; mobile browsers about 40MB.
Does converting MP4 to AVI lose quality?
Yes, some. Both MP4 and AVI are lossy, so this is a second compression pass over data that was already compressed. The loss is usually modest, but always convert from your original rather than from a previous conversion.
Is it free to convert MP4 to AVI?
Yes, with no account, no watermark and no daily limit. The processing happens on your device rather than on a server, so there are no per-conversion costs to pass on.
Are my files uploaded when converting MP4 to AVI?
No. FFmpeg runs as WebAssembly inside your browser tab. The file is read from your disk, processed in memory and written back out — it never reaches a server.