Microphone Instrument Tuner
Tune a single instrument note using your microphone. See the nearest note, frequency and cents sharp or flat with standard A4 = 440 Hz tuning.
How can I tune an instrument using my microphone?
Press Start microphone and allow access, then play one clear, sustained note near your device. The tuner estimates its frequency and shows the nearest equal-tempered note using A4 = 440 Hz. A negative cents value means the note is flat; a positive value means it is sharp. Aim close to zero.
Play a clear, sustained note
Waiting for a note
Your microphone is off.
Three simple steps
How to use Microphone Instrument Tuner
Press Start microphone and allow microphone access.
Play one sustained note and wait for a stable reading.
Adjust the instrument toward zero cents, then stop the microphone.
Common questions
Good to know
Understand the result.
Keep the original.
Is this tool free, and are my files uploaded?
This tool is free with no account required. The work happens in your browser. Your input and files are not sent to a processing server.
What are the limits and details?
Requires microphone permission and a secure browser connection. Designed for single sustained notes between 50 and 2,000 Hz, not chords, percussion or noisy recordings. Microphone quality and background noise affect the estimate. Audio is processed on your device without recording or uploading it. Stop, hide or leave the page to release the microphone.
Single notes, 50–2,000 Hz. No audio recording or upload.