Convert audio files between MP3, WAV, M4A (AAC), OGG Vorbis, FLAC, and OPUS — including WAV to MP3, M4A to MP3, and MP3 to WAV. Batch-convert several files at once; FFmpeg WebAssembly does the work on your device, so nothing is uploaded.
How to use Audio Format Converter
Pick the target format (and a bitrate for MP3, M4A, OGG, or OPUS).
Drop in one or more audio files — mixed input formats are fine.
Click Convert and download each converted file from the list.
Frequently asked questions
Are my audio files uploaded to a server?
No — FFmpeg runs as WebAssembly inside your browser, so files never leave your device.
Can I convert several files at once?
Yes — add as many files as you like; they are converted one after another and each gets its own download button.
Which conversion should I pick?
MP3 for maximum compatibility, WAV for editing, M4A for Apple devices, OPUS for the smallest size at a given quality, FLAC for lossless archiving, and OGG for open-source projects.
Does converting between lossy formats lose quality?
Re-encoding lossy audio (e.g. MP3 to OGG) always loses a little quality. When you care about fidelity, convert from a lossless source (WAV/FLAC) or pick a higher bitrate.