Convert MP4 to AVI — Free & Private
Convert MP4 to AVI online for free. MP4 is the most universally compatible video format; AVI is a classic Microsoft video container format. All processing happens locally in your browser — your files never leave your device.
How to convert MP4 to AVI
- 1
Select your MP4 file
Click or drag your MP4 file onto the converter above.
- 2
Convert to AVI
The output format is pre-set to AVI. Click the convert button to process your file.
- 3
Save instantly
Your converted AVI file is ready — save it to your device, no email required.
MP4 to AVI — FAQ
Is the MP4 to AVI converter really free?
Yes, completely free. No hidden fees, no watermarks, no file size limits. LocalConvert is open source and free forever.
Are my MP4 files safe?
Absolutely. Your files never leave your browser. All MP4 to AVI conversion happens using WebAssembly running locally on your device — no uploads, ever.
How long does MP4 to AVI conversion take?
Most conversions finish in seconds. Larger files may take a little longer depending on your device's speed and memory.
What's the difference between MP4 and AVI?
MP4 is the most universally compatible video format. AVI is a classic Microsoft video container format.