UD5 Toolkit
Piano Key Frequency Finder – Note to Hz & MIDI Number
Select a piano key to see its frequency in Hz and MIDI note number. Great for tuning, synthesis, or music theory exploration with interactive keyboard.
Tag: MIDI Input Monitor
5+ toolsWeb MIDI Keyboard Tester - Online Visual Note Display
Connect your MIDI keyboard and see pressed notes visually on a piano roll. Check velocity, channel, and aftertouch. No DAW needed.
Audio to MIDI Converter - Online Transcribe Melody
Analyze a monophonic audio recording and convert the pitch into a MIDI file. Perfect for capturing musical ideas. Client-side.
Web MIDI Monitor - Online View Raw MIDI Messages
Connect a MIDI controller and see every message in a log. Filter by channel and type. Essential for debugging music apps.
MIDI Note to Frequency Converter - Online Music Tuning
Enter a MIDI note number (0–127) or a musical note name and get the exact frequency in Hz. Piano keyboard picker.