Convert MP4 to AVI Online — No Upload, No Watermark
AVI is the legacy Microsoft container required by some older editors, projectors, and CCTV/DVR systems. Converting MP4 to AVI gives you back-compat without losing the source file.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Where MP4 files come from
Converting to AVI is a compatibility move for old equipment: DVD players with a USB port, industrial or medical display systems, and legacy software that was written when AVI was the assumption.
What changes when you convert MP4 to AVI
| Container | MP4 rewritten as AVI |
|---|---|
| Video | Re-encoded to H.264 at CRF 23 |
| Audio | Re-encoded to AAC |
Worth knowing first
Old hardware that demands AVI usually also demands old codecs inside it, typically Xvid or DivX rather than H.264. An AVI holding H.264 may still be rejected by the device you are trying to satisfy. Test with a short clip before converting a long one.
FAQ
My DVD player still will not read the AVI. Why?
Because the container was only half the requirement. Players from that era expect MPEG-4 Part 2, which means Xvid or DivX, and cannot decode H.264 regardless of the wrapper. Those codecs are not available in a browser, so this is a case for desktop software.
Is AVI ever the better choice today?
Only for specific legacy hardware. It cannot store modern metadata, has no reliable variable frame rate support, and produces larger files. Use it when something you cannot replace insists on it.
Will the file get bigger?
A little, from AVI's per-chunk overhead. The bulk of the size comes from the video encode, which is unchanged.
Is this MP4 to AVI converter really free and without upload?
Yes. The tool runs entirely in your browser using FFmpeg compiled to WebAssembly. Your MP4 file never leaves your device — open the DevTools Network tab to verify zero uploads. No signup and no watermark. The practical size limit is the memory your browser gives this tab, which is generous on a computer and a few hundred megabytes on a phone.