How to use the MP3 Compressor
- Choose the MP3.
- Choose the new bitrate.
- Tick Mono for speech.
- Compress and download.
Bitrate guide for MP3
- 128 kbps stereo: music that still sounds good.
- 96 kbps: background music, casual listening.
- 64 kbps mono: podcasts and lectures.
- 32–48 kbps mono: long audiobooks and voice notes.
Good to know
Lossy files keep their format and are re-encoded at the bitrate you choose. Lossless or uncompressed files are saved as MP3 (or stay WAV on the WAV compressor). Tags such as title and artist are kept where the format supports them.
Supported files
MP3, WAV, M4A, AAC, OGG, OGA, FLAC, OPUS, WMA, AIFF, AIF, AIFC, ALAC, AMR, AC3, MP2, M4B, M4R, CAF, AU, WEBA, 3GA, APE and VOC. Files up to 1 GB each.
Frequently asked questions
Can I make an MP3 sound better by raising the bitrate?
No. Re-encoding at a higher bitrate makes the file bigger without restoring lost detail.
Is the MP3 Compressor free?
Yes, completely free, with no sign-up and no watermark. Files up to 1 GB each can be converted, and there is no daily limit.
Do you keep a copy of my files?
We never receive them. All processing happens on your device, so there is nothing for us to store or delete.
Does it work on iPhone and Android?
Yes, in Safari, Chrome and other modern mobile browsers. Short files work best on phones; for long or high-resolution videos a computer is faster.