Convert audio online: WAV, MP3, FLAC and Ogg

How to convert an audio file

This works the same way for WAV to MP3, MP3 to WAV, FLAC to MP3, M4A to WAV and any other combination below.

1. Click Open a file to convert, or use File ▸ Open… (Ctrl+O). Most formats your browser can play will open: WAV, MP3, OGG, FLAC, M4A/AAC and WebM audio.
2. Optional: change the sample rate, the number of channels or the bit depth with Edit ▸ Convert Sample Type… (F11), for example to turn stereo into mono or 48 kHz into 44.1 kHz.
3. Choose File ▸ Save As… (Ctrl+Shift+S).
4. In Format, pick Windows PCM (*.wav), FLAC (*.flac), MP3 (*.mp3) or Ogg Vorbis (*.ogg).
5. Set the quality: Resolution for WAV, Resolution and Compression for FLAC, Bitrate for MP3 and Quality for Ogg Vorbis.
6. Type a file name and click Save. Chrome and Edge ask where to save it; other browsers put it in your downloads.

Which format should you choose?

Pick the format by what happens to the file next.

• WAV: uncompressed and accepted everywhere, the safe choice for video editing and further processing. Use 16-bit for CD-quality delivery and 24-bit or 32-bit float to keep headroom for more editing.
• FLAC: lossless compression, the same audio as WAV in a smaller file. 16 or 24-bit, with compression levels from 0 to 8; higher levels give smaller files and never lower quality.
• MP3: the most compatible lossy format, for podcasts, sharing and older players. Constant bitrate from 64 to 320 kbps, or variable bitrate from V0 (best) to V9 (smallest).
• Ogg Vorbis: an open lossy format, popular for games and web players, with quality from -1 to 10.

Tips for better conversions

A conversion is also a good moment to fix the file.

• Converting MP3, M4A or Ogg to WAV or FLAC does not bring back detail lost in compression. It makes the file easier to edit, which is useful, but keep your lossless originals.
• Avoid converting from one lossy format to another more than once; every pass loses a little more.
• Fix the level while you are here with Effects ▸ Amplitude ▸ Normalize…, or trim silence at the start and end.
• Need only part of the file? Select it and use File ▸ Save Selection… to export just that part.
• WAV exports keep your cues, so markers you add with F8 travel with the file.

Converting many files at once

File ▸ Batch Process… runs a recorded script over open files or files from disk and exports every result in the format you choose. A script needs at least one step, so record one first with Edit ▸ Scripts ▸ Record Script, for example a Normalize step. The batch then levels and converts every file in one go.

Auditius exports audio only, as WAV, FLAC, MP3 or Ogg Vorbis. It does not write M4A/AAC or WebM, and it does not extract audio from video files.