WebM to MP3 Converter
Pull the audio track out of any WebM video file and save it as MP3. Ideal for converting YouTube downloads, browser screen recordings, voice-call captures, and HTML5 video into a portable MP3 you can play anywhere.
Drop your WebM file here or click to browse
WebM (.webm) · Max 20 MB
Free — 10-second preview, 5 conversions/month. Upgrade for unlimited
What is WebM?
Google's open-source web video container. Used by YouTube downloads, browser screen recordings, and HTML5 video. Extract audio for sharing or editing.
What is MP3?
The most widely used audio format. Great compatibility, small file size. Ideal for music, podcasts, and general use.
Why Convert WebM to MP3?
WebM is the open-source video container Google built for the web. It is the format your browser uses internally for HTML5 video, WebRTC voice calls, screen recordings from Chrome and Firefox, and many YouTube and Twitch downloads. Inside a WebM file the audio track is almost always Opus or Vorbis — both excellent codecs, but both poorly supported outside the web. Most music players, car stereos, podcast platforms, and older devices simply will not play a WebM file. Converting the audio to MP3 solves all of that: every device on earth plays MP3, every editing tool reads it cleanly, every podcast host accepts it. The conversion is lossy — Opus or Vorbis gets transcoded to MP3 — so at very low bitrates you might notice a slight quality drop, but at 192 to 256 kbps the difference is inaudible for nearly everyone. AudioUtils runs the entire conversion in your browser using a WebAssembly build of FFmpeg, so your file never leaves your device. Useful for extracting audio from anything saved off the web without uploading sensitive recordings to a stranger's server.
Who Uses This Converter
Extract audio from YouTube WebM downloads
Saved a YouTube video as WebM with yt-dlp or a browser extension? Pull the audio out as MP3 for offline listening, podcast clipping, or a quick reference track.
Browser screen recording → podcast
Chrome and Firefox save screen recordings as WebM with Opus audio. Convert to MP3 to share the narration, edit it in Audacity, or pop it into a podcast feed.
WebRTC call captures
Zoom, Google Meet, Discord, and WebRTC apps often save recordings as WebM. Extract the audio for transcription, replay at 2× speed, or archival.
HTML5 video archives
Older HTML5 video archives and many open-source platforms use WebM. Get a portable MP3 for any device or workflow that needs cross-platform audio.
Frequently Asked Questions
Can I convert a YouTube WebM download to MP3?
Yes, as long as you have the WebM file on your device already. Tools like yt-dlp or your browser's media inspector can save YouTube video as .webm — this converter then extracts the audio and writes it as MP3. AudioUtils only handles the conversion step; it does not download videos directly (we respect YouTube's Terms of Service). For full guidance see our post on how to convert YouTube to MP3 legally.
WebM uses Opus or Vorbis audio — does converting to MP3 lose quality?
A little, yes. Both Opus and Vorbis are higher-quality codecs than MP3 at any given bitrate, so re-encoding to MP3 introduces a small additional generation of lossy compression. At 192 to 256 kbps MP3 the difference is essentially inaudible for speech, podcasts, and most music. For maximum quality use the WebM to WAV path instead and re-encode from WAV if you need MP3 later.
Will this work on browser screen recordings (Chrome, Firefox, OBS)?
Yes. Chrome and Firefox produce WebM files when you record the screen via the desktopCapture API or any extension that uses it. OBS Studio can also output WebM. All of these files contain Opus audio that this tool extracts and transcodes to MP3 — useful for clipping the audio from a tutorial, a Zoom recording, or a live stream capture.
What if my WebM file is huge — will it work?
The free tier handles files up to 20 MB. Pro handles up to 500 MB which covers nearly any browser recording or YouTube download (a 1080p hour-long YouTube WebM is typically 200–400 MB). Conversion happens locally in your browser, so even on Pro the file never uploads anywhere.
Does the converter preserve the original sample rate?
Yes, the source sample rate is preserved unless the source uses something unusual. WebRTC and Opus default to 48 kHz; most YouTube WebM files are also 48 kHz. The MP3 output matches, so when you import into a 48 kHz DAW or video editing session there is no resampling and no quality drop on that axis.
Why can't I just rename .webm to .mp3?
Renaming changes only the file extension — the container is still WebM and the codec inside is Opus or Vorbis. Most audio players will refuse to open it or play silence. A real conversion has to demux the container, decode the audio, and re-encode it as MPEG-1 Layer III. That's what this tool does.
Can I trim the audio while converting?
Not in this tool — it's a clean container-to-container extraction. Once you have the MP3, use the AudioUtils audio cutter or trimmer to grab the segment you want. Both run locally in your browser as well.