Audioknife

WebM to MP3 Converter

Convert WebM files, like browser and screen recordings, to MP3 for free in your browser. No upload, no sign-up, no watermark. Works on phones and computers.

  • No upload
  • Free, no sign-up
  • No watermark
  • Works on phones

iPhone note: older iPhones (before iOS 17) can’t open WebM files. If you get an error, try Chrome or Firefox on a computer or Android.

How to convert WebM to MP3

  1. Drop your WebM file on the box above, or tap it to choose. You can pick several files at once.
  2. MP3 is already selected. Adjust the quality if you like (192 kbps is a good default, 320 kbps for the best quality).
  3. Tap the download button next to each file. Your MP3 is saved to your Downloads folder.

Many web recorders and screen-capture tools save WebM. Pull out the audio as an MP3 that plays everywhere.

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Frequently asked questions

Does it work on iPhone?

Newer iPhones usually can open WebM audio, older ones can't. If you see an error, use Chrome or Firefox on a computer.

Can I convert a WebM video?

Yes. The audio track is extracted and saved as MP3; the video is ignored.

Can I convert several files at once?

Yes. Choose or drop as many files as you like. They are converted one after another and each gets its own download button.

Are my files uploaded?

No. The conversion runs inside your browser on your own device. Your audio is never sent to a server, so it works with private and unreleased recordings.

Is it really free?

Yes. No sign-up, no watermark, no daily limit. Very long files (over about an hour) may be too big for a phone's memory.