Audio Converter
Convert audio between MP3, WAV, M4A, FLAC, OGG, Opus, AAC, WMA, AIFF and M4R in your browser. Set bitrate, sample rate and channels; batch files.
One converter for the formats people actually meet: MP3 for everything, WAV and AIFF for editing, FLAC and Apple Lossless for archiving, M4A/AAC for Apple devices, OGG and Opus for small files, WMA for old Windows players and M4R for iPhone ringtones. It also takes the soundtrack from MP4, MOV, MKV and WebM videos. Everything runs inside your browser, so your files are never uploaded.
How to use this tool
- Choose one or more audio or video files.
- Pick the output format. For lossy formats choose a bitrate; for WAV, FLAC, ALAC and AIFF choose the bit depth.
- Leave sample rate and channels on "Keep" unless a device or upload form asks for something specific.
- Press Calculate, play the result and download it (several files come as one ZIP).
Formula
Lossy size ≈ bitrate (kbps) × 1000 ÷ 8 × seconds · WAV size = sample rate × channels × bytes per sample × seconds + header
MP3 and WAV are produced by your browser's own decoder plus the LAME encoder or a WAV writer, so they need no download. The other formats, and files the browser cannot decode (WMA, AMR, AIFF in some browsers, APE), use the ffmpeg engine, a one-time download of about 30 MB that your browser caches.
Example
A 4-minute stereo WAV at 44.1 kHz/16-bit is 44,100 × 2 × 2 × 240 ≈ 42.3 MB. As MP3 at 192 kbps it becomes 192,000 ÷ 8 × 240 = 5.76 MB, and as FLAC typically 20–30 MB with no loss at all.
Frequently asked questions
Which format should I choose?
MP3 if it just has to play everywhere. M4A (AAC) sounds a little better at the same bitrate on Apple devices. FLAC or Apple Lossless when you want an exact copy that is smaller than WAV. Opus gives the smallest files for speech.
Does converting MP3 to FLAC or WAV improve quality?
No. A lossless format keeps exactly what the MP3 still contains; detail removed by the MP3 encoder cannot come back. It only makes sense when an editor or device needs that format.
Are tags and cover art kept?
Yes, with "Keep tags" on: title, artist, album, track, year and genre go into every format that can hold them (MP3, M4A, ALAC, FLAC, OGG, Opus, WMA and M4R), and the front cover into MP3, M4A, ALAC and FLAC. WAV, AIFF and .aac files keep little or none of it.
Why does a file fail?
Copy-protected (DRM) purchases such as old iTunes M4P files cannot be decoded by anyone but the licensed player, and damaged files have no readable audio. The other files in a batch are still converted.
Last updated:
Page address with these inputs: https://kakao.mobile/tools/audio-converter/
Cite or embed this tool
kakaoCalc. (2026, November 8). Audio Converter. https://kakao.mobile/tools/audio-converter/
“Audio Converter.” kakaoCalc, 8 Nov. 2026, kakao.mobile/tools/audio-converter/.