Free music tools that run in your browser

A BPM & key finder, an audio cutter and a LUFS loudness meter for musicians, DJs and podcasters. They run in your browser, so your files never leave your device. No upload, no sign-up, no watermark.

Why these tools are different

Most free audio sites upload your file to their server. CalcSunny does the work inside your browser with the Web Audio API, so it is faster, private, and works with unreleased music.

Frequently asked questions

Are these audio tools really free?

Yes. All tools are free to use with no account and no watermark.

Do you upload or keep my audio?

No. Files are processed on your own device by your browser and are never sent to a server.

Do the tools work on a phone?

Yes. They work in modern mobile browsers such as Safari on iPhone and Chrome on Android.