Audio Compressor
Reduce audio file size online, free and private.
100% in your browser — nothing is uploaded
Audio Compressor
The Audio Compressor reduces an audio file's size, right in your browser, by lowering its sample rate and mixing it to mono where appropriate — useful when you need a lighter file for a message, a demo, an email, or a draft where pristine fidelity is not the priority. Drop in a track, pick how aggressive you want the reduction to be, and the tool re-renders the audio locally and shows you the before-and-after size so you can see exactly what you saved, then downloads the smaller file. File size matters more often than people expect: messaging apps and forms cap attachments, websites load faster with lighter assets, and sending a quick reference of an AI-generated idea does not need a full-resolution master. Because the tool processes everything locally with the Web Audio API, your audio is never uploaded — your unreleased work stays on your device. A note on method and scope: the compressor reduces size by lowering sample rate and channels and exporting WAV, which is reliable and instant in the browser. It does not yet export compressed formats like MP3 or AAC, which would shrink files further at a given quality but need a heavier in-browser audio engine — that is on our roadmap. For the common need — a noticeably smaller file, fast and private — sample-rate reduction does the job. If instead you want a clean full-quality copy in a universal format, use the Audio Converter. It is free, needs no account, and processes everything locally, so you get a lighter file in seconds without ever uploading your audio.
How to use it
- 1
Add your file
Drag in an audio file or browse to it. It is decoded locally — nothing uploads.
- 2
Choose a level
Pick how much to reduce — balanced, small, or tiny — depending on how light you need it.
- 3
Compress & compare
See the before-and-after size, then download the smaller file.
Made for AI music creators
Need to quickly share an AI-generated idea without sending a huge file? Shrink it here and download a lighter version — privately, with nothing uploaded.
Frequently asked questions
How does this reduce file size?
It lowers the sample rate and, at smaller settings, mixes to mono, then exports WAV. That meaningfully reduces size for sharing and drafts while keeping the process instant and fully in-browser.
Will it reduce quality?
Some — lowering the sample rate trades fidelity for size. It is ideal for demos, references, and attachments. For a pristine copy, use the Audio Converter instead.
Can it output MP3 for even smaller files?
Not yet. MP3/AAC encoding would shrink files further at a given quality but needs a heavier in-browser engine, which is planned. For now it exports a reduced-size WAV.
Is my file uploaded?
No. Compression runs entirely in your browser with the Web Audio API, so your audio never leaves your device.
What's the difference between this and the converter?
The converter makes a clean full-quality WAV for compatibility; the compressor deliberately reduces size by lowering sample rate and channels for lighter files.