AVI to MP4 Converter
Convert legacy AVI videos to compact, modern MP4 in your browser.
AVI is an older Microsoft container that often produces large files and isn't well supported on modern phones or web platforms. Converting to MP4 gives you a smaller, broadly compatible video.
The conversion runs entirely in your browser, so even large legacy clips stay on your own device.
How to convert AVI to MP4
- 1Drop your AVI file into the area above — or click to browse.
- 2The output format is already set to MP4. Adjust the quality settings if the format supports them.
- 3Click convert, then download your MP4 file. Everything runs locally — nothing is uploaded.
Frequently asked questions
AVI often uses older codecs with weaker compression, so files can be much bigger than MP4 at the same quality. MP4's modern H.264 codec is far more space-efficient.
Yes. MP4 with H.264 is supported by virtually all smartphones, browsers, and media players, which is exactly why it's the best target format for old AVI clips.
No. All processing happens entirely in your browser. Your data never leaves your device — nothing is uploaded to any server.
Yes. Once the page has loaded, the tool works completely offline. For the best experience, install PrivaDeck as a PWA from your browser.
Other conversions
Need a different format?
Open the full video converter to switch between MP4, MKV and AVI, choose H.264 or H.265, and convert with hardware acceleration where available.
Open the full Video Converter