BPM Finder is a browser-based audio tool for estimating song tempo in a simple and practical way. It is designed for DJs, music producers, musicians, video editors, fitness instructors, and anyone who needs a quick tempo reference for music-related work.

Key features

• Analyze the tempo of a single audio file directly in the browser

• Process multiple tracks in batch mode for faster library or playlist review

• Use tap timing when no audio file is available

• Check live input through a microphone for rehearsal or practice situations

• Review detected results and make manual adjustments when needed

• Export results for follow-up workflow and track organization

How it works

Users can upload one file, add several files for batch processing, tap along to a rhythm, or use microphone input when music is playing from another source. The app then estimates the track speed and presents the result in a clear format for review.

This workflow is useful when preparing playlists, organizing sample folders, checking rehearsal material, or matching music to editing timelines. The interface is built to keep the process direct, without requiring desktop installation or a complex setup.

What's new in this version

This version includes support for real-time microphone input as an additional way to estimate song tempo. It also continues to support file-based analysis, batch processing, and tap timing in the browser.

System requirements and limitations

This web app works best in modern browsers that support Web Audio API and WebAssembly, including recent versions of Chrome, Edge, Firefox, and Safari. Microphone mode requires browser permission and may not work if access is denied or the device is already in use by another application.

Supported audio formats include MP3, WAV, FLAC, AAC, OGG, and M4A. Large or low-quality files may take longer to process depending on the device and browser environment.