Audio Converter – Convert MP3 WAV OGG M4A FLAC Online (Free)
Free online audio converter. Convert MP3, WAV, OGG, M4A, FLAC, AAC, Opus, WMA and more — choose bitrate and quality. Powered by FFmpeg WASM, runs entirely in your browser, nothing uploaded.
Example Output
A re-encoded MP3 at your chosen bitrate. Lossless formats (WAV/FLAC) skip the bitrate setting and preserve every bit.
lecture.mp3 (1h, MP3 192 kbps, ~85 MB)
What is Audio Converter?
Convert between every major audio format right in your browser — MP3, WAV, OGG, M4A, FLAC, AAC, Opus and more. The tool uses FFmpeg compiled to WebAssembly so conversions run locally on your machine with the same engine professional audio editors use. No upload, no account, no usage caps.
Why use this tool?
- Works offline after the first page load
- Lightweight page weight that loads quickly even on slow connections
- Works on desktop, tablet, and mobile in any modern browser
How to use
- Upload an audio file (drag-drop or click)
- Pick output format (MP3/WAV/OGG/M4A/FLAC/AAC/Opus)
- Choose bitrate for lossy formats
- Click Convert and download the result
Examples
M4A → MP3 for an old car stereo
A new iTunes purchase comes as M4A; the car stereo only plays MP3. One conversion at 192 kbps and it works without quality loss for spoken content.
FLAC → ALAC (M4A)
Re-encode a lossless FLAC archive into ALAC (M4A) so Apple Music / iTunes recognises it.
WMA → universal MP3
A legacy WMA voice memo converts to MP3 so it plays on iOS, Android, web, anywhere.
Common use cases
- Format conversion between Apple / Windows / Linux ecosystems
- Re-encoding to a smaller bitrate to save space
- Producing universal MP3 from any source
- Lossless archive prep (→ FLAC)
- Preparing files for systems that only accept specific formats
Troubleshooting
- Output quality sounds worse than source
- Bitrate set too low. Use 192 kbps or higher for music; 128 kbps is fine for voice only.
- Conversion fails with cryptic FFmpeg error
- Source may be DRM-protected (Apple Music protected AAC, Audible, etc.). DRM-free files convert fine; protected ones require removing DRM first via the original platform.
- Vietnamese filename causes weird filename on download
- Browsers handle UTF-8 filenames inconsistently. Rename to ASCII before converting if your downstream system doesn't like Unicode filenames.
Frequently Asked Questions
MP3, WAV, OGG (Vorbis), M4A (AAC), FLAC, AAC (ADTS), and Opus for output. Input accepts those plus WMA, WebM audio, MP4 audio, and most things FFmpeg can decode.
Try these related tools
Explore more Audio Tools
Discover other free, privacy-first tools in Audio Tools.