Music Key Detector Free - Find Song Key & Scale Online (2025)
Detect the musical key of any song instantly. Upload audio to find key, scale, and chords. Free online tool for DJs, musicians, and producers.
Upload Audio File
Choose an audio file from your device in any common format (MP3, WAV, OGG, etc.)
AI Analysis
Our advanced algorithms analyze the audio frequencies to detect the musical key and scale
View Results
Get the detected key, confidence level, scale type, and suggested chords instantly
🎧 DJ Mixing
Mix tracks harmonically by matching compatible keys for seamless transitions
🎹 Music Production
Know the key before adding new elements, samples, or creating remixes
📝 Transcription
Identify the key before transcribing music to make the process faster and more accurate
🎓 Music Education
Learn music theory by analyzing the keys and scales of your favorite songs
How accurate is the key detection?
Our AI algorithms provide 85-95% accuracy in most cases. Accuracy may be lower for complex or atonal music.
What file formats can I detect?
We support all common audio formats: MP3, WAV, OGG, M4A, FLAC, AAC, and more.
Why is knowing the song key important?
Knowing the key helps you mix compatible tracks, transcribe music, create harmonies, and improvise more effectively.
What is relative major/minor?
Relative keys share the same notes but start on different notes. For example, C major and A minor are relative keys.
Are my files uploaded to a server?
Yes, files are temporarily uploaded for analysis but are deleted immediately after processing. We do not store your audio files.
What is the difference between major and minor keys?
Major keys typically sound bright and happy, while minor keys sound darker and more melancholic. They use different scale patterns starting from different root notes.