Key & BPM Lab – Free Key, BPM & Audio Tools · Key & BPM Lab

Key & BPM Lab is a free, browser-based suite of audio tools for musicians, DJs, and producers. Its core function is to analyze a song's musical key, BPM, scale, and Camelot code, and to change key or tempo without affecting pitch. Many tools run locally in your browser, ensuring privacy, while AI-powered features (like vocal removal and stem splitting) use cloud processing with clear explanations of data handling.

What is Key & BPM Lab?

Key & BPM Lab is a web application that provides a set of focused audio tools. It takes local audio files as input and outputs detected musical information (key, BPM, scale, Camelot code) or transformed audio (e.g., pitch-shifted, tempo-changed, cut, joined). The platform runs in any modern browser, with local processing for core tools and optional cloud/AI processing for advanced features. It is developed by Key & BPM Lab (keybpmlab.com).

Key Features

• Key & BPM Finder — Detects tempo, musical key, scale, and Camelot code from a local audio file, with results displayed in a clear interface.
• Key & BPM Changer — Changes tempo without changing pitch, transposes a track, and exports the result as WAV.
• Audio Cutter — Trims audio files to desired segments, with local processing.
• Audio Joiner — Combines multiple audio files into one, locally.
• BPM Tapper — Taps along to a beat to determine tempo manually.
• Online Metronome — Provides a metronome for practice at a measured tempo.
• Voice Recorder — Records audio directly in the browser.
• AI Tools (via credits) — Includes Vocal Remover, Stem Splitter, Audio Enhancer, and Audio to MIDI, available with a subscription or one-time credit packs.

Who is it for?

• Musicians and producers — Analyze a song's key and BPM to plan remixes, mashups, or live sets.
• DJs — Change the key or tempo of tracks to harmonically mix and beat-match.
• Practice and education — Use the metronome and BPM tapper to practice rhythm and timing.
• Content creators — Cut, join, and enhance audio for videos, podcasts, or other media.

What can you do with Key & BPM Lab?

• Remixing and mashups: Find the key and BPM of two songs, then use the Key & BPM Changer to match them before mixing.
• Practice sessions: Use the online metronome and BPM tapper to practice at a specific tempo.
• Audio cleanup: Use the Audio Cutter to trim unwanted sections, or the Audio Joiner to combine takes.
• Stem separation: Use AI-powered Vocal Remover and Stem Splitter to isolate vocals or instruments for remixing or karaoke.

How does Key & BPM Lab work?

The workflow is straightforward: choose a tool, upload or record a local audio file, and process it. Core analysis and editing tools decode and process files locally in your browser, keeping your audio private. For AI features, the tool page explains what data is sent and stored. Results are displayed on-screen or exported directly to your device as WAV files.

Pricing

Key & BPM Lab offers a free tier with essential tools, and paid plans for AI features. The free plan includes Key & BPM Finder and Changer, Audio Cutter and Joiner, BPM Tapper, Metronome, and Voice Recorder, with no credits or subscription required. Paid plans (Plus and Pro) provide monthly AI credits for advanced tools like Vocal Remover and Stem Splitter. One-time credit packs are also available. A 30-day money-back guarantee applies.

FAQ

Are the audio tools free?

Yes, the essential audio tools (Key & BPM Finder, Changer, Audio Cutter, Joiner, BPM Tapper, Metronome, Voice Recorder) are free to use with no subscription. AI-powered tools require credits, which are available through a subscription or one-time packs.

Do you upload or save my songs?

For local tools, your audio files are processed entirely in your browser and are not uploaded to our servers. For AI tools, the tool page explains what data is sent and stored. We do not save your source audio to an account or cloud bucket.