Audio to MP3
Convert audio files (m4a, wav, ogg) to MP3 with bitrate control.
How to use this tool
- Drop one or more audio files.
- Choose MP3 bitrate.
- Convert all and download them.
How it works
Files decode to interleaved PCM; lamejs encodes the samples into MP3 frames and a .mp3 blob is assembled for download.
Tips
- Keep 320 kbps for song archives you'll remaster.
- Voice and podcasts are perfectly fine at 128 kbps.
Limitations
Lossy output quality depends on the source's original quality; browser decodes must support the input format.
Frequently asked questions
How does MP3 encoding happen?
The audio decodes to PCM via Web APIs, then lamejs encodes it to MP3 on-device.
What bitrate should I use?
192 kbps for general use; 320 for near-CD quality; 128 for voice notes.
Does it support batch?
Yes — drop multiple files and convert them all at once.