Convert AVI to MP4 Instantly
The fastest way to convert AVI to MP4 online. Files never leave your browser — there's nothing to upload, nothing to wait for.
AVI to MP4 is launching soon
We're rolling out browser-based AVI to MP4 conversion next. Meanwhile, try one of our live converters below — they all run 100% client-side, exactly the same way.
See live convertersWhy our AVI to MP4 converter is different
Lightning fast
Most AVI files become MP4 in under a second. No upload queue, no waiting room.
Private by default
Your AVI never touches our servers. The whole conversion runs locally in your browser.
Pixel-perfect quality
Resolution and content are preserved end-to-end. The MP4 output is exactly what your file deserves.
Works everywhere
Any modern browser on desktop, tablet, or phone. Nothing to install, nothing to update.
How it works
Three steps. No accounts, no uploads, no nonsense.
Drop your AVI
Drag a AVI into the dropzone, or paste it from your clipboard.
Convert to MP4
Your browser re-encodes the file locally. Nothing is sent over the network.
Download your MP4
Grab the finished MP4 as soon as it's ready. Convert another in one click.
About converting AVI to MP4
If you've ever needed to turn a AVI into a MP4, you already know how clunky most online converters can be: queue, upload, ad-wall, captcha, download. We built this AVI to MP4 tool the opposite way. It's a single page, the conversion runs locally in your browser, and the result is ready before most sites have finished loading their ad scripts. Under the hood, AVI — Microsoft's legacy multimedia container — is decoded using the browser's built-in support, then re-encoded as MP4, the H.264/AAC container that plays everywhere. Nothing about your file is transmitted to a server, which means there is no upload size limit imposed by us, no privacy footnote to read, and no account to create. It's the AVI to MP4 converter we wanted to exist, so we shipped it for free.
Frequently asked
Will the MP4 output keep the same quality as my AVI?+
We preserve the original resolution and content. Because AVI is Microsoft's legacy multimedia container and MP4 is the H.264/AAC container that plays everywhere, some characteristics may change by definition — but no quality is lost beyond what the destination format itself requires.
Are my AVI files uploaded to a server?+
No. The conversion happens entirely in your browser using local Web APIs. Your AVI file never leaves your device, which is why this tool is safe for sensitive content.
Is this AVI to MP4 converter really free?+
Yes. There's no paywall, no signup wall, and no per-file fee. You get unlimited AVI-to-MP4 conversions when signed in, and a generous free quota without an account.
Will my converted MP4 have a watermark?+
Never. The output MP4 file is byte-for-byte yours — no watermark, no metadata injection, no branding.
Why MP4 instead of another format?+
MP4 is the H.264/AAC container that plays everywhere, which makes it a strong default for most use cases people convert AVI into. If you need a different output, we likely have a dedicated converter for that pair too.