How to use the Audio Compressor
- Choose the audio file.
- Pick a bitrate. 64–96 kbps for speech, 128 kbps for music.
- Tick Mono for voice recordings to halve the size.
- Compress and download.
How much smaller?
Size is directly proportional to bitrate: a 320 kbps file compressed to 96 kbps becomes about 30% of its size. Lossless and uncompressed files (WAV, FLAC, AIFF) are converted to MP3, which shrinks them by 80–95%.
Mono for speech
Voice recordings rarely need stereo. Mono halves the data needed, so a 64 kbps mono file sounds as clear as a 128 kbps stereo one for speech.
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
Which format do I get?
Lossy files keep their format (M4A stays M4A, OGG stays OGG). Lossless files become MP3.
Is the Audio 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.