Convert MP4 to AVI for Free
AVI is an older video format, but it is still the format some legacy editing software, industrial hardware players, and older Windows systems specifically require. Converting an MP4 to AVI online for free takes under a minute, and it does not require installing any desktop software.
Why AVI is still needed in 2026
Most modern devices and websites prefer MP4, but AVI has not disappeared. Some point-of-sale systems, factory equipment, older video editing suites, and legacy Windows XP or Windows 7 era software were built around AVI and simply do not accept MP4 as input. If a piece of hardware or software specifically asks for an AVI file, converting is usually faster than trying to work around the requirement.
How to convert MP4 to AVI online for free
- Open the MP4 to AVI converter.
- Drop your MP4 file onto the page, or click to browse and select it.
- The tool re-encodes the video directly in your browser using FFmpeg.wasm.
- Download the converted AVI file.
Why MP4 to AVI takes longer than other video conversions
Converting between MP4 and MOV, or MP4 and MKV, is often a fast container swap because the underlying video codec does not change. AVI is different: it does not reliably support the modern H.264 codec that most MP4 files use, so this MP4 to AVI converter has to fully re-encode the video into a codec AVI can hold. That takes more processing time than a simple remux, though the visible quality difference is usually minor.
Is it actually free, and is my video uploaded anywhere?
Yes to both questions in the way that matters most: the conversion is completely free with no watermark, no sign-up, and no limit on how many videos you convert, and your video is never uploaded to a server. The re-encoding happens entirely inside your browser tab using WebAssembly, so the file stays on your own device the whole time.
Questions
Frequently asked
Is this MP4 to AVI converter really free?
Yes, completely free with no watermark, no sign-up, and no limit on how many videos you convert.
Do I need to install any software to convert MP4 to AVI online?
No. The conversion runs entirely in your browser tab using WebAssembly, so there is nothing to download or install.
Will converting MP4 to AVI reduce video quality?
There is a small quality trade-off from re-encoding, similar to any conversion that changes the underlying video codec, though it is usually not noticeable at normal viewing size.
Is my video uploaded to a server during conversion?
No. The entire conversion happens locally in your browser tab; your video file never leaves your device.