Audio Compressor
Make an audio file smaller by re-encoding it at a lower bitrate — right in your browser.
Everything ran in your browser — nothing was uploaded.
How to use the Audio Compressor
- Drop in an audio file.
- Choose how small you want it (the bitrate).
- Click Convert and download the smaller MP3.
About the Audio Compressor
The Audio Compressor reduces the size of an audio file by re-encoding it to MP3 at a lower bitrate. Pick a target — from a small 96 kbps up to a fuller 192 kbps — and get a lighter file that is easier to email, upload or store. It runs on a WebAssembly build of ffmpeg, so your file is never uploaded; it is private, free and has no watermark.
Handy when a file is too big for an attachment limit, a message, or a website upload box. Remember that audio compression is lossy: a lower bitrate means a smaller file but some loss of fidelity, so 128–160 kbps is a good balance for music, while 96 kbps is fine for speech. The engine is downloaded once and cached for next time.
Frequently asked questions
Is my file uploaded?
No. Compression runs entirely in your browser; nothing is uploaded.
How much smaller will it get?
It depends on the original. A high-bitrate file dropped to 128 kbps can shrink a lot; a file that is already small may barely change.
Will it reduce quality?
Yes, some. MP3 compression is lossy, so a lower bitrate trades quality for size. 128–160 kbps is a good balance for music, 96 kbps for speech.
What formats can I put in?
Almost any audio (or video) file — the output is an MP3 at your chosen bitrate.