AVI to MP4 Converter – Free & No Upload
Convert legacy AVI files to modern MP4 locally in your browser — your video never leaves your device
AVI is a 1990s container that modern phones, browsers and web platforms handle poorly. This tool re-encodes your AVI into a standard H.264 MP4 that plays everywhere — entirely in your browser, with nothing uploaded.
How to convert AVI to MP4
- Choose or drag in your AVI file — nothing is uploaded, it stays on your device.
- Click Start. H.264 sources are rewrapped losslessly in seconds; other codecs are re-encoded to H.264 in your browser.
- Download your MP4.
Frequently asked questions
Will the quality drop?
AVI files usually hold older codecs (DivX, Xvid, MJPEG…), so they are re-encoded to H.264 at a bitrate chosen to preserve the source's visual quality. For typical AVI sources the result looks the same while often being smaller.
Is my video uploaded to a server?
No. The conversion runs entirely in your browser using WebAssembly (FFmpeg). Your file never leaves your device — that is also why there is no upload wait, no queue and no file-size pricing.
What is the maximum file size?
Up to 8GB on desktop browsers and 2GB on mobile. There is no limit on the number of files you convert, and no signup or watermark.