Song Key Finder
Analyzes music and finds musical key. Choose audio files
Music pitch detector
This app analyzes audio and detect the musical Key [i.e tonality]. The algorithm works well with most of the songs but may give incorrect results for songs consisting of different melodic parts.
You can get Keys for several files at once. Additionally you get the song BPM.
It works directly in the browser, no needs to install any software, is available for mobile devices.
Privacy and security: your files does not leave your device.
To change the Key of the song use Pitch Shifter tool.