MP3 Converter

An MP3 converter is a tool that transforms audio files from MP3 format into other audio formats (or keeps them as MP3). This particular one runs entirely in your browser — no uploads, no servers, no internet connection needed after the page loads.

Different situations call for different formats. You might convert to WAV or AIFF when working in a DAW like Logic Pro or Audacity, because those formats are lossless and editors prefer uncompressed audio. You might convert to AAC or M4A for Apple devices, since those formats sound better than MP3 at the same file size. FLAC is popular for archiving music collections without any quality loss. WMA is sometimes required for Windows-specific software or older media players.

The drop zone is where you load your file — either drag an MP3 onto it or click to browse
The format grid (AAC, AIFF, FLAC, M4A, MP3, WAV, WMA) selects your output format; the active one is highlighted
The Convert button runs the conversion after you’ve chosen a file and format
The Download button appears after conversion and saves the output file to your computer

It depends on your device’s RAM, since the entire file is decoded into memory. Most files up to 100–200 MB should be fine on a modern computer. Very long files (hours of audio) may be slow or cause the browser tab to run out of memory, since WAV and AIFF in particular expand significantly when decoded to uncompressed PCM.

The tool uses the browser’s built-in Web Audio API — no external libraries. When you hit Convert, it reads your MP3, decodes it into raw audio data (PCM samples), then re-packages that data into the container format you chose. WAV and AIFF are built by hand-writing the correct binary file headers. MP3 passthrough skips decoding entirely and just copies the original bytes. AAC and M4A use the browser’s native MediaRecorder API to re-encode. FLAC and WMA export the raw PCM data with the correct file extension, since browsers don’t have native encoders for those formats — but most players (VLC, Windows Media Player, foobar2000) read them correctly.

Yes, our MP3 converter tool is completely free of charge.