Audio Converter
Convert audio files between MP3, WAV, AAC (M4A), FLAC, and OGG Opus. Choose a bitrate for lossy formats; WAV and FLAC stay lossless.
Local processing only — your file never leaves the browserWhat this tool does
- Five output formats: MP3, AAC/M4A, OGG Opus (lossy) and WAV, FLAC (lossless)
- Pick 128 / 192 / 256 / 320 kbps for lossy formats; the bitrate field is disabled automatically for WAV and FLAC
- Accepts MP3, WAV, M4A, AAC, FLAC, OGG, and Opus inputs up to 200 MB
- Preview the converted audio in the browser before downloading
- Runs locally with ffmpeg.wasm — your file never leaves your device, nothing is uploaded
How to use
- 1
Drop an audio file
Drag & drop or tap to select any common audio file, up to 200 MB.
- 2
Choose the output format
MP3 for universal playback, AAC/M4A for Apple, OGG Opus for the smallest size at a given quality, WAV/FLAC to stay lossless.
- 3
Pick a bitrate (lossy only)
192 kbps is transparent for most music; 320 kbps for archival lossy; 128 kbps for voice or small files.
- 4
Convert and download
Conversion runs in your browser. Preview the result, then download.
What each setting means
Recommended settings
Common pitfalls
Symptom: Converting MP3 → WAV/FLAC did not improve the quality
Cause: Quality lost in the original lossy encode is gone permanently. Re-encoding to lossless only makes the file bigger.
Fix: Go back to the original lossless or highest-bitrate source if you need better quality.
Symptom: The output sounds the same but the file is much bigger
Cause: You raised the bitrate above the source bitrate, or converted lossy → lossless.
Fix: Match or stay below the source bitrate; there is no benefit to exceeding it.
Symptom: A very large file is slow or runs out of memory
Cause: Everything runs in the browser tab, so memory is limited.
Fix: Keep files under ~200 MB; trim long recordings first if needed.
Equivalent FFmpeg commands
Reference commands you can run on the desktop FFmpeg CLI.
ffmpeg -i input.wav -vn -c:a libmp3lame -b:a 192k output.mp3ffmpeg -i input.flac -vn -c:a aac -b:a 256k output.m4affmpeg -i input.mp3 -vn -c:a libopus -b:a 128k output.oggffmpeg -i input.wav -vn -c:a flac output.flacBrowser support & limits
- Runs in the browser, so very large files are limited by available memory (keep under ~200 MB).
- Audio-to-audio only — use the Audio Extractor for pulling audio out of a video.
Privacy
This tool runs ffmpeg.wasm directly in your browser. Files never leave your device — everything runs locally. Read the privacy policy →
Frequently asked questions
Is my audio uploaded anywhere?
No. Conversion runs entirely in your browser via ffmpeg.wasm. The file never leaves your device and nothing is sent to a server.
Which format should I choose?
MP3 for maximum compatibility, AAC/M4A for Apple devices, OGG Opus for the smallest size at a given quality, and WAV or FLAC when you must keep lossless quality (e.g., for further editing).
Does converting to a higher bitrate improve quality?
No. You cannot recover detail that a previous lossy encode discarded. A higher bitrate only makes the file larger. Always start from the best-quality source you have.
What is the difference between WAV and FLAC?
Both are lossless. WAV is uncompressed PCM and large; FLAC compresses the same audio to roughly 50–60% of the size with no quality loss. Use FLAC unless a tool specifically needs WAV.
Why is the bitrate selector greyed out?
WAV and FLAC are lossless formats that do not use a target bitrate, so the selector is disabled when you pick them.
Can it convert the audio inside a video file?
This tool is for audio-to-audio conversion. To pull the audio track out of a video, use the Audio Extractor tool instead.