Where do WebM files even come from?

Mostly from browsers and the tools built on them: screen recorders, browser voice notes, clips saved from sites that serve WebM, and exports from meeting software. It is a genuinely good format that simply never made it into car stereos and older players — which is why this page exists.

Will the MP3 be smaller than the WebM?

If the WebM carried video, dramatically — the picture is usually most of the bytes, and it is dropped. For audio-only WebMs the MP3 lands in the same region, sometimes a little larger, because Opus compresses speech better than MP3 does. Either way, what you gain is a file that plays everywhere.

Is there a quality cost?

One re-encode's worth, kept minimal at 320 kbps. The audio in a WebM is Opus or Vorbis — both lossy — so this is a second generation, inaudible for speech and close to it for music. WAV is one click away if you would rather not re-encode at all.

Why did my file fail?

The likeliest reason on this page is a WebM that is video-only — some clips genuinely have no audio track, and there is nothing to extract. Failures are reported on the file's own row, so a batch keeps going.

Is it free, and is my file uploaded?

Free, with no account and no cap on how many files. Each file has a length limit, though: about an hour and a half in Chrome and Edge, and three hours in Firefox and Safari, which cut anything longer at that point. Everything runs in your browser. Your files are never uploaded.

Convert WebM to MP3

WebM is what browsers themselves produce — screen recordings, browser-based voice notes, clips saved off the web — so it is fitting that a browser is all it takes to get the audio back out. Drop the file in, the video track is set aside, and the sound comes back as an MP3 that plays in things that have never heard of WebM.

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Your recordings
Drop your WebM files here
WebMMP3WAV
Your files are never uploaded.
What you want back
Your files

How to convert WebM to MP3

Add your WebM files

Screen recordings, saved clips, voice notes. Decoded by your browser, never uploaded.
Leave it on MP3

320 kbps. WAV if it is going into an editor next.
Save the audio

One file or the whole batch as a zip.

What you get

The natural end of a screen recording

Most screen recordings are meetings, walkthroughs and calls where the picture was only ever context. The audio as an MP3 is smaller to store, easier to share, and ready for a transcript.

The decoder is already here

WebM was designed for browsers, so every current one reads it — Opus or Vorbis audio alike, measured in all three engines rather than assumed. Nothing to install, nothing to download.

Works on the audio-only WebMs too

Plenty of .webm files have no picture at all — browser voice recorders produce them constantly. Those convert exactly the same way, minus the note about a video track being dropped.

Recordings are never uploaded

A recording of a meeting is not a file to push through an unknown server. This page decodes it where it sits; the network tab will show that the file never leaves your device.

Questions about WebM

Where do WebM files even come from?: Mostly from browsers and the tools built on them: screen recorders, browser voice notes, clips saved from sites that serve WebM, and exports from meeting software. It is a genuinely good format that simply never made it into car stereos and older players — which is why this page exists.
Will the MP3 be smaller than the WebM?: If the WebM carried video, dramatically — the picture is usually most of the bytes, and it is dropped. For audio-only WebMs the MP3 lands in the same region, sometimes a little larger, because Opus compresses speech better than MP3 does. Either way, what you gain is a file that plays everywhere.
Is there a quality cost?: One re-encode's worth, kept minimal at 320 kbps. The audio in a WebM is Opus or Vorbis — both lossy — so this is a second generation, inaudible for speech and close to it for music. WAV is one click away if you would rather not re-encode at all.
Why did my file fail?: The likeliest reason on this page is a WebM that is video-only — some clips genuinely have no audio track, and there is nothing to extract. Failures are reported on the file's own row, so a batch keeps going.
Is it free, and is my file uploaded?: Free, with no account and no cap on how many files. Each file has a length limit, though: about an hour and a half in Chrome and Edge, and three hours in Firefox and Safari, which cut anything longer at that point. Everything runs in your browser. Your files are never uploaded.

Need the words rather than the sound? The transcriber turns recordings into text, on this same no-upload model. Cleaning up a noisy recording first? Remove the background noise. Or see all the audio tools.

Your recordings

What you want back

Your files