Convert WebM to MP3
You convert WebM to MP3 by dropping the .webm file into the converter on this page and clicking the button; the audio is extracted and saved as an MP3 while the video is left behind. ffmpeg runs the extraction inside your browser, so the clip you downloaded stays on your own device.
Runs in your browser. Your file never leaves your device.Drop your WebM hereChoose a WebM to convert
It becomes a MP3 right in your browser, up to 200 MB
Your file never leaves your device
Works in airplane mode. See the proof
Limits, published exactly
| Where it runs | In your browser. The file never leaves your device. |
|---|---|
| Free conversions | Unlimited. No account, no ads, no queue, no watermark. |
| Max file size, free | 200 MB |
Why convert WebM to MP3?
WebM is the open container the modern web runs on, and it is what you end up with when you save a clip from YouTube or another site that serves video in the browser-native format. A .webm is awkward to live with off the web: you cannot drop it on most basic music players, an old phone may refuse it, and you rarely want the picture when all you were after was the talk, the song or the podcast segment. Pulling the audio out as MP3 turns a downloaded web clip into a plain audio file that behaves like any other track, ready for a commute, a playlist or a transcription tool, with no video weight attached.
What is WebM?
WebM is the web-native, royalty-free video format Google introduced in 2010, built on the VP8/VP9 video codecs and Vorbis or Opus audio. Every modern browser plays WebM directly, HTML5 video embraces it, and no patent licensing is attached to it anywhere in the chain. Outside browsers it is less at home: many desktop players, editing suites and devices still prefer MP4.
What is MP3?
MP3 is the audio format that ate the world in the late 1990s, and it remains the most universally supported way to store sound: lossy compression at roughly a tenth of CD size, playable on literally anything with a speaker. Newer codecs like AAC and Opus beat it on quality per kilobyte, but no format comes close to its compatibility across car stereos, ancient MP3 players, browsers, editing software and upload forms.
Quality and what to expect
WebM audio is usually Opus or Vorbis, and it is re-encoded once to MP3 by LAME at a high variable bitrate (around 190kbps equivalent); since both source and target are lossy, this is a second generation of loss, though it is hard to hear on a clip that started at a reasonable bitrate. The video track is discarded, not converted, so extraction is fast and the output is audio only with no way to recover the picture. Length and channels are preserved. Note that audio saved off a streaming site is often already fairly compressed, so the MP3 inherits whatever quality that download had; converting cannot add back detail the source never carried.
WebM to MP3 FAQ
Why did the clip I saved come down as a WebM?
Because the modern web serves video in WebM to browsers, and saving the playing media hands you what the browser received. It is the open, royalty-free container sites like YouTube use, which is great on the web and clumsy on basic audio players.
Will converting improve the audio quality?
No. The WebM audio is already lossy, and re-encoding to MP3 can only preserve or slightly reduce what is there, never add detail back. If the saved clip sounded compressed, the MP3 will too; the conversion just changes the container and codec.
Does my downloaded clip get sent to a server?
It does not. The WebM is processed by ffmpeg compiled to WebAssembly inside your browser tab, and the audio is extracted on your own machine. You can disconnect from the internet after the page loads and the conversion still completes.
Can I get the video back from the MP3?
No. The MP3 contains only the audio track; the video is discarded during extraction and is not stored in the output. Keep the original WebM if you might want the picture later.