Convert WebM to MP3
Convert a WebM recording into an MP3 that plays on any device. The conversion runs in your browser, so the recording is never uploaded.
Your file never leaves your device. How?
Your media is processed in your browser and is not uploaded to our servers for conversion. Page assets (including the converter engine) still load over the network.
Select or drop a video or audio file
MP4, MOV, WebM, MKV, M4A, WAV, FLAC, OGG and more. Converted on your device.
Click, tap, or drop a fileHow to convert WebM to MP3
Choose the WebM file
Drop or select the .webm recording.
Pick the bitrate
128 kbps is ideal for voice recordings; 192 kbps for music.
Convert
The Opus or Vorbis audio is decoded and re-encoded as MP3 on your device.
Download
Check the MP3 in the player, then download it.
Where WebM files come from
WebM is the format browsers use when they record. Screen recorders and voice recorders built into websites, many online meeting and interview tools, and videos saved from web pages often produce .webm files. The audio inside is usually Opus or Vorbis.
Opus sounds good but many players can't open it: Windows Media Player, older iPhones, car stereos and a lot of audio editors expect MP3. Converting to MP3 makes the recording playable everywhere and easy to attach or share.
What happens to your WebM
FFmpeg in WebAssembly decodes the WebM's first audio track (Opus or Vorbis) and encodes it with the LAME MP3 encoder. Any VP8 or VP9 video in the file is ignored.
Some browser recorders write WebM files without a duration in the header. That doesn't stop conversion, but the duration and size estimate may be missing until the MP3 is ready.
Features
Opus and Vorbis
Reads both audio codecs used in WebM files.
Voice-friendly defaults
Pick 128 kbps for meetings and interviews to keep files small.
No upload
Recordings of meetings and calls stay on your device.
Plays anywhere
The MP3 works in every player, editor and phone.
Frequently asked questions
Is my file uploaded anywhere?
No. The conversion runs in your browser with a WebAssembly build of FFmpeg. Your file is read from your device and the result is saved back to it; nothing is sent to our servers.
Why can't I play my WebM file?
WebM usually contains Opus or Vorbis audio, which many desktop players, older phones and car stereos don't support. MP3 is supported everywhere.
Does it keep the audio quality?
Opus to MP3 is a lossy re-encode. At 128 kbps speech sounds identical; for music choose 192 kbps or higher.
My recording shows no duration. Will it still convert?
Yes. Some browser recorders leave the duration out of the file header. Conversion still works; the time is just unknown until it finishes.
How large a file can I convert?
Files up to 4 GB and 4 hours long on a computer, or 2 GB and 2 hours on a phone. The video is read in pieces rather than loaded into memory, so large recordings work; only the audio file being written has to fit in memory.
Can I get an MP4 video instead?
Yes. WebM to MP4 re-encodes the video as H.264 so it plays on Windows, Mac and phones.
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