WebM to MP3 Converter
Drop in WebM files and get MP3 back in seconds, processed entirely on your device.
WEBM files (most other audio and video files work too). Files stay on your device.
How it works
- Choose your WebM file, or drop it on the page. You can add several files at once.
- Choose MP3 quality: a bitrate (128 to 320 kbps; 192 kbps is a common balance) or leave the default.
- Click Convert. Processing happens on your device and shows progress; you can cancel at any time.
- Preview the result and download the MP3 file. With several files, download them all as one ZIP.
About WebM to MP3 conversion
WebM (WebM container with Opus or Vorbis audio) suits recordings made in the browser and audio taken from web video. MP3 (MPEG-1/2 Audio Layer III) suits music libraries, podcasts and sharing when you cannot know what the listener uses.
Both formats are lossy, so converting re-encodes the audio and costs a little quality each time. Keep your WebM original, and choose a MP3 bitrate at least as high as the source for the best result.
For a 4-minute track, a typical WebM file is about 3 MB and a typical MP3 file is about 6 MB. Your own result depends on the bitrate and the audio itself.
WebM vs MP3
MP3 support: Plays on virtually every phone, car stereo, TV, browser and media player made in the last 25 years.
WebM support: Plays in Chrome, Firefox, Edge and Android. Browser recordings (MediaRecorder) are usually WebM.
| Detail | WebM | MP3 |
|---|---|---|
| Type | Lossy | Lossy |
| Codec | Opus or Vorbis | MP3 |
| Typical bitrate | depends on the codec inside; Opus at 64 to 128 kbps is typical | 128 to 320 kbps; 192 kbps is a common balance |
| A 4-minute track | about 3 MB | about 6 MB |
| File extensions | .webm, .weba | .mp3 |
| Best for | recordings made in the browser and audio taken from web video | music libraries, podcasts and sharing when you cannot know what the listener uses |
| Introduced | 2010 | 1993 |
Quality and compatibility notes
- MP3: Each re-encode loses a little more detail, and there is no true gapless support without extra tags.
- WebM: Poor support in desktop audio players and editors, and on older Apple software.
- MP3 bitrate range: 128 to 320 kbps; 192 kbps is a common balance.
- Tags: MP3 stores ID3v1 and ID3v2 tags, including cover art.
Questions
Does converting WebM to MP3 reduce quality?
A little. Both WebM and MP3 are lossy, so converting re-encodes the audio. A high bitrate keeps the loss very small, and keeping your original avoids any permanent change.
How big will the MP3 file be?
For a 4-minute track, a typical WebM file is about 3 MB and a typical MP3 file is about 6 MB. Your own result depends on the bitrate and the audio itself.
Is my WebM file uploaded anywhere?
No. The conversion runs in your browser on your device. The file is never sent to a server, and nothing is stored after you close the page.