Free tools · Compress & resize
Compress audio
Make an audio file smaller by re-encoding it to a lower-bitrate MP3 — handy for email, messaging, or a lighter podcast download. Browser-only, no upload, no watermark.
Runs entirely in your browser. Your file is never uploaded — no watermark, no account.
How to use Compress audio
- 1
Choose your file. Drop a file into the tool, or click to select one. It stays on your device — nothing is uploaded.
- 2
Pick your settings. Adjust the options if you like, then press Run. The first run downloads a ~32 MB engine once; after that it's instant.
- 3
Download. Everything is processed right in your browser — download the finished file instantly, with no watermark.
Frequently asked questions
- Is Compress audio free? Is there a watermark?
- Yes — Compress audio is completely free, with no sign-up, no watermark, and no limit on how many files you process.
- Do my files get uploaded to a server?
- No. Compress audio runs entirely in your browser with WebAssembly, so your MP3, WAV, M4A, AAC file never leaves your device and nothing is stored or seen by us.
- What can I put in, and what do I get out?
- Compress audio accepts MP3, WAV, M4A, AAC and gives you back a MP3 file. You can also set bitrate before you run it.
- Can I control the output?
- Yes — you can adjust bitrate, so you decide the balance between file size and quality.