Convert WebM to MP3
The web's video format, reduced to the part you wanted to hear — converted privately on your device.
Drop your video or audio here
or
MP4, MOV, WebM, MKV, AVI, MP3, WAV and more — any size, no upload
🔒 Files never leave your device — everything runs in your browser.
WebM is what browsers produce and consume: screen recordings, video calls saved locally, clips downloaded from the web. Its audio lives in Opus or Vorbis — codecs that are excellent and yet unplayable in most cars, older phones, and audio apps. MP3 is the passport that gets that audio through every door.
The tool decodes the WebM's audio track and re-encodes it as high-quality MP3 right in the browser — fitting, since the browser is where the file was probably born. Nothing uploads; a recorded meeting or class stays entirely on your machine.
How it works
- Drop your file
Any common format, any size. Nothing is uploaded — the tool runs in your browser.
- Convert
Compatible files are repackaged instantly with zero quality loss; others are hardware-transcoded at high quality.
- Download
Your converted file is ready on your device — nothing to wait for, nothing to delete from a server.
Frequently asked questions
My WebM is a screen recording — will the voice stay clear?
Yes. Screen-recording audio is usually Opus, which decodes cleanly, and speech re-encodes to MP3 with no audible change at the quality used here. The result is a small file any note app or player opens.
Why won't the WebM's audio play in my car or MP3 player directly?
Because it is Opus or Vorbis in a WebM container — a combination built for browsers, not consumer audio hardware. MP3 is the format that predates and outlives all of these compatibility gaps.
What happens to the video part?
It is discarded — the output is audio only, which is why an MP3 extracted from a large recording is so much smaller than the source file.
Is my file uploaded to a server?
No. ConvertUno runs entirely in your browser on your own device. Your file never leaves your computer or phone — there is no upload at all.
Is it really free, with no watermark?
Yes. Processing happens on your device, so serving you costs us almost nothing — no watermark, no account, no file-size limit, no daily quota.