No source-file upload
The browser reads and decodes the audio locally. Our application server does not receive the selected song.
Free browser-based audio tools
Find, change and edit your music
Analyze key and BPM, adjust pitch or tempo, edit audio and practice with accurate rhythm tools. Your audio is processed on your device—not uploaded to our servers.
- No audio uploads
- Runs in your browser
- Free to use
keybpmlab.com
Key & BPM
A minor · 128 BPM
Audio Cutter
Trim + Fade
Pitch & Tempo
Independent controls
Practice Tools
Tapper + Metronome
Files stay in your browser
Choose a tool
Everything you need to work with key, tempo and audio
Start with the task you need. Each tool has a focused workspace, clear instructions and answers for common audio questions.
Key & BPM Finder
Detect a song's tempo, musical key, scale and Camelot code from a local audio file.
Analyze a song
Key & BPM Changer
Change tempo without changing pitch, transpose a track and export the result as WAV.
Change key or BPM
Audio Cutter
Select a precise section, add fade in and fade out, and export a new WAV.
Cut an audio file
Audio Joiner
Arrange multiple files, apply a crossfade and merge them into one continuous track.
Join audio files
Voice Recorder
Record from your microphone, pause, review and download WebM or WAV.
Record your voice
BPM Tapper
Tap along with a song to measure its tempo manually—no microphone access needed.
Tap the tempo
Online Metronome
Practice with an adjustable BPM, time signature and a clearly accented first beat.
Start the metronome
Private by design
Your music stays on your device
Traditional online audio tools often send a file to a remote server for processing. KeyBPM Lab uses browser audio APIs, local processing threads and downloadable models so the selected song can be processed without leaving your device.
No file storage
Your source audio and generated results remain in browser memory and are not saved to an account or cloud bucket.
Direct local export
When a tool creates new audio, the browser prepares the download directly on your device.
One private workflow from analysis to export
Find the track's starting values, make the change you need and download the result without creating an account.
1
Choose your task
Open the dedicated finder, changer, vocal separator, tapper or metronome.
2
Process it locally
Audio analysis and transformation run in browser workers so the interface stays responsive.
3
Use the result
Read the detected values, practice at the measured tempo or download transformed audio.
KeyBPM Lab FAQ
Common questions about our free browser audio tools.
Start with your song's key and BPM
Choose a local audio file and get the tempo, musical key, scale and Camelot code without uploading it.
Free to use. No account or audio upload required.