Convert WebM to MP3 in your browser
Turn the soundtrack of a WebM file into an MP3 that plays everywhere. Everything happens on your device: the file is never sent to a server.
How it works
- 1
Choose or drop the WebM file, such as a browser screen recording, a meeting capture or a video exported from a web app.
- 2
Keep MP3 at 192 kbps or pick 128, 256 or 320 kbps. M4A and WAV are also available.
- 3
Click the WebM to MP3 button and download the MP3. No upload, no account.
What is a WebM file?
WebM is the open video format of the web. Browsers produce it when you record your screen or webcam with a website or an extension, many online meeting and recording tools save to it, and some video platforms and web apps export in it. The video inside is VP8, VP9 or AV1, and the audio is almost always Opus, sometimes the older Vorbis.
Opus is an excellent codec, but plenty of software does not handle it: many car stereos, older music players, some podcast and transcription services, and a lot of desktop apps expect MP3. The WebM to MP3 tool bridges that gap by decoding the Opus audio and encoding it to MP3 with the LAME encoder.
Typical uses
Keep the audio of a recorded call, webinar or course you made yourself. Turn a screen recording with voice-over into a file you can listen to on the go or send to a transcription service. Reuse the soundtrack of a clip you exported from a browser-based editor.
Please only convert files you have the right to use, such as your own recordings or content published under a licence that allows it. Vidmini does not download anything from video sites: it only works with files that are already on your device.
Quality: what changes in the conversion
Opus and MP3 are both lossy formats, so converting one to the other always means one decode and one new encode. At 192 kbps the result is transparent for most speech and music; use 256 or 320 kbps if the source is high-quality music. Choosing a higher MP3 bitrate than the source cannot add detail that is not there, it only makes the file bigger.
If you plan to edit the audio, choose WAV instead: it stores uncompressed 16-bit PCM, so no further quality is lost while you work on it. M4A (AAC) is another option when you need a small file for Apple devices; since WebM audio is not AAC, it is re-encoded too.
Private, even for sensitive recordings
Meeting and screen recordings often contain things you would rather not upload: names, documents, internal discussions. Vidmini decodes and encodes the audio in your browser using WebCodecs and WebAssembly. The page is only allowed to talk to vidmini.com for its own code, uses no tracking cookies and keeps working offline once it has loaded.
Frequently asked questions
Does WebM to MP3 work in every browser?
It works in the latest Chrome, Edge, Firefox and Safari, on desktop and mobile. Decoding depends on the browser’s codec support; Chrome and Edge have the widest support, so try them first if a file does not open.
Can I convert a WebM from a YouTube or social media video?
Vidmini only converts files already on your device and does not download from any website. Only convert content you own or are allowed to reuse; downloading copyrighted videos may break the platform’s terms and copyright law.
My WebM file has no sound. What happens?
Some screen recordings are saved without an audio track, for example when the microphone or tab audio was not enabled. In that case there is no sound to extract. Play the file first to check that it actually contains audio.
Is there a file size limit?
We don’t set one. Long recordings of several gigabytes work on desktop browsers because the output is streamed to the browser’s private storage. Phones are limited by free memory and storage.
Which bitrate should I pick for a recorded meeting?
For speech, 128 kbps is clear and keeps files small, about 1 MB per minute. Use 192 kbps if there is music, and 320 kbps only for high-quality music sources.
Can I get the video as MP4 instead?
Yes. Use the WebM to MP4 tool to keep the picture and convert it to a format that plays on iPhones, TVs and editing software.