Convert · AVI → MP4
Convert AVI to MP4 — right in your browser
Drop an old .avi file and get a modern .mp4 that plays on phones, the web and current editors. It's converted on your own device, so the file is never uploaded.
Why convert AVI to MP4?
AVI is an older container — reliable, but bulky and often rejected by phones, browsers and modern editors. MP4 (H.264) is smaller and plays nearly everywhere, so converting both shrinks the file and fixes compatibility.
Most converters upload your clip to a server first. VidKit doesn't — the conversion runs locally in your browser, so nothing is stored or logged. (AVI uses the built-in software engine, so it's a little slower than newer formats.)
Frequently asked questions
Is my .avi file uploaded anywhere?
No. The conversion happens entirely in your browser, on your own device. There's no server that could receive the file — check your browser's Network tab while it runs and you'll see zero bytes leave.
Why is AVI a bit slower to convert?
AVI isn't handled by the fast hardware path, so it runs through a built-in software encoder in your browser. It still works fully offline — it just takes a little longer than MP4 or MOV.
Will the MP4 be smaller?
Usually, yes — MP4 with H.264 is far more efficient than most AVI files, so you often get a smaller file at similar quality. You can also set a target size before converting.