Turn MP4 Files Into MP3 in Seconds
Lightning-quick MP4-to-MP3 conversion that runs entirely on your device. Private by default, free forever, with no watermarks.
MP4 to MP3 is launching soon
We're rolling out browser-based MP4 to MP3 conversion next. Meanwhile, try one of our live converters below — they all run 100% client-side, exactly the same way.
See live convertersWhy our MP4 to MP3 converter is different
Lightning fast
Most MP4 files become MP3 in under a second. No upload queue, no waiting room.
Private by default
Your MP4 never touches our servers. The whole conversion runs locally in your browser.
Pixel-perfect quality
Resolution and content are preserved end-to-end. The MP3 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 MP4
Drag a MP4 into the dropzone, or paste it from your clipboard.
Convert to MP3
Your browser re-encodes the file locally. Nothing is sent over the network.
Download your MP3
Grab the finished MP3 as soon as it's ready. Convert another in one click.
About converting MP4 to MP3
MP4-to-MP3 conversion sounds simple until you try to do it ten times in a row on a flaky web tool. We built this page specifically for that workflow. Drop a MP4 (the H.264/AAC container that plays everywhere), and the browser immediately re-encodes it as MP3 (the most widely supported lossy audio codec). You can drop a single file or a whole batch — the tool processes them in parallel and gives you each output as soon as it's ready. Because everything happens client-side, your files don't leave your machine, which makes this safe to use with sensitive documents, work-in-progress designs, or anything you'd rather not hand to a third party. The conversion logic uses well-tested browser APIs, so the resulting MP3 is consistent across operating systems and matches what you'd get from a desktop tool — without the install.
Frequently asked
Can I convert multiple MP4 files to MP3 at once?+
Yes. Drop a whole folder of MP4 files into the dropzone and they'll be converted to MP3 in parallel. Each output downloads as soon as it's ready.
Is there a file size limit for MP4 to MP3 conversions?+
There's no server-side limit because we don't run a server. The practical ceiling is whatever your device's RAM can comfortably load — usually hundreds of megabytes for images and documents.
Will the MP3 output keep the same quality as my MP4?+
We preserve the original resolution and content. Because MP4 is the H.264/AAC container that plays everywhere and MP3 is the most widely supported lossy audio codec, some characteristics may change by definition — but no quality is lost beyond what the destination format itself requires.
Are my MP4 files uploaded to a server?+
No. The conversion happens entirely in your browser using local Web APIs. Your MP4 file never leaves your device, which is why this tool is safe for sensitive content.
Is this MP4 to MP3 converter really free?+
Yes. There's no paywall, no signup wall, and no per-file fee. You get unlimited MP4-to-MP3 conversions when signed in, and a generous free quota without an account.