Audio Converter

Audio Converter changes an audio file’s format and settings in your browser. It reads MP3, WAV, FLAC, Ogg Vorbis, Ogg Opus and WebM audio (including the audio track of WebM videos) and writes MP3, WAV, FLAC, Ogg Vorbis or Opus, with options for bitrate, sample rate, mono or stereo and the output file name. The work is done by libav.js, an open-source WebAssembly build of FFmpeg’s libraries loaded from this site.

Different apps, devices and websites accept different audio formats. Converting locally avoids uploading recordings that may be private. Conversion decodes and re-encodes the audio, so lossy outputs lose some quality and converting a lossy file to WAV or FLAC does not restore detail. The tool only offers formats it can actually create.

1. Drop an audio file, or a WebM video with an audio track, onto the upload area.
2. Check the source format, codec, sample rate, channels, length and size.
3. Choose the output format; bitrate is shown for MP3, Ogg Vorbis and Opus.
4. Optionally change the sample rate or switch between mono and stereo.
5. Edit the output file name if you like, then press Convert.
6. Listen to the converted audio, compare the sizes, and download it.

• MP3, WAV, FLAC, Ogg, Opus and WebM audio input
• MP3, WAV (16-bit), FLAC (16-bit), Ogg Vorbis and Opus output
• Bitrate, sample rate and mono/stereo options
• Custom output file name
• Original and converted file size shown side by side
• Automatic fallback to the highest supported bitrate, clearly reported
• Extracts audio from WebM videos
• Runs locally in a worker with real progress

• Use MP3 at 192 kbps or more for music that must play everywhere.
• Use Opus or Ogg Vorbis for small files with good quality at low bitrates.
• Use FLAC or WAV for editing and archiving, not to “improve” a lossy file.
• Use mono at 64–96 kbps for speech recordings to save space.
• Keep the original file in case you need a different format later.