Convert Video to MP3

Yes — one at a time, as many as you like. There is no quota because nothing is processed on a server; each conversion uses your own device.

No. It is a web page that uses the browser’s built-in WebCodecs. Chrome, Edge and Firefox work best; Safari’s audio support is more limited.

The MP3 is written at a high bitrate, and because the audio inside a video is already compressed, the export sounds the same as the original for normal listening. MP3 is lossy, so it can't add detail the video didn't have — but it also isn't throwing away anything you'd notice. If you need a bit-perfect copy for editing rather than listening, use the extract-audio tool's WAV option instead.

MP4, MOV, WebM and MKV are the reliable ones — the containers browsers decode natively. Older or niche formats like AVI, FLV and WMV usually can't be decoded in the browser and will fail; if you have one of those, convert it to MP4 first. What matters is the codec inside, not just the extension, so a file that plays in your browser will almost always convert here.

Yes — there's no length or size cap, because the work happens on your own machine rather than a server with upload limits. A long file simply takes longer and uses more memory while it runs; on a typical laptop an hour of video is fine. The output is a single MP3 of the whole thing, which is what you want for a podcast, lecture or meeting you'll listen to or transcribe later.