ConvertBox Logo
ConvertBox

Audio Converter

Convert audio between MP3, WAV, FLAC, AAC, M4A and OGG. Choose bitrate, mono/stereo and sample rate, up to 100MB per file — all in your browser.

How to Use

  1. Select an audio file to convert (MP3, WAV, FLAC, AAC, M4A, or Ogg — up to 100MB)
  2. Choose the output format — MP3 for universal playback, WAV for lossless, AAC (.m4a) for Apple devices, FLAC for archiving
  3. Pick a bitrate to match your goal: 128 kbps for voice, 192 kbps for standard music, 256 kbps for high quality
  4. Click the "Convert" button — processing runs locally via FFmpeg.wasm, so files never leave your device
  5. The converted file downloads automatically once finished
  6. Use the output in music libraries, podcast editors, car USB drives, or any media player

All processing is done in your browser, and files are never sent to a server.

Frequently Asked Questions

Supported formats include MP3, WAV, FLAC, AAC, and OGG.
Converting to lossless formats (WAV, FLAC) preserves quality. Converting to compressed formats (MP3, AAC) may slightly reduce quality depending on bitrate.
Currently, files are converted one at a time for best results.
If conversion fails: (1) use a file under 100MB, (2) try converting to MP3 first if using an uncommon format, (3) check that the file plays correctly in a media player, (4) refresh the page and retry.
No. FFmpeg.wasm runs the conversion in your browser — files never leave your device.
ID3 tags are preserved when converting between tag-aware formats (MP3, M4A, FLAC). Cover art is kept by default.
Different codecs use different compression. MP3 and AAC are lossy; FLAC and WAV are lossless. Size shifts are expected.

Related tools