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Compress MP3

Make an MP3 smaller by re-encoding it at a lower bitrate — ideal for email, messaging or saving space. Drop your file, pick a bitrate, and download. Everything runs in your browser; your audio is never uploaded.

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Frequently asked questions

No. Compression runs entirely in your browser with FFmpeg compiled to WebAssembly. Your file never leaves your device — no upload, no account.

The first time, your browser downloads the audio engine (a one-time download, then cached). After that, compression starts immediately.

128 kbps is great for music, 96 kbps is a good balance, and 64 kbps is best for spoken word/podcasts where the smallest size matters.

Lowering the bitrate is lossy, so some quality is traded for size. For voice the difference is hard to hear; for music, stay at 128 kbps for near-transparent results.