Online Instrument Tuner

The tuner below works by capturing audio from a microphone connected to your computer. The program detects the pitch of the captured audio and tells you what note is being played an how out of tune it may be.

How to use this tuner: This tuner works essentially how a handheld electronic tuner would. You play a string, and it reports back to you if the tone is sharp or flat. All you need is your computer and a microphone. Push Start when you are ready to begin capturing audio.

This tuner is still under development. Comment below if you have any problems, questions, or suggestions. I am still working on it to make it ultra-user friendly and to make it the best free online instrument tuner out there. Help me, help you.

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NOTE: When loading this page for the first time, your pc will ask you something along the lines of "The application's digital signature cannot be verified. Do you want to run the application?". It says this because the program needs to access your computer resources to capture the audio from your microphone, so it is just a security precaution, just know that this is normal.

IF IT DOESN'T WORK: This tuner works by using the Operating System's Default Recording Line. Make sure your microphone is plugged. Check to see if the recording volume is reasonable and that your Operating System detects your microphone. Test your microphone by trying to record something by using your OS's default sound recorder. If you record a sound and play it back and it doesn't work, I highly doubt this tuner would work, so you would need to fix that. If recording a sound file does work but this tuner does not, then comment below and tell me what Operating System and Sound Card/Motherboard you have.

Comments (6)
Pages | 1


I need like an actual tuner that records what I playband them tells me if I'm flat or sharp...not some paragraph that tells me how it done. How am I supposed to know if the note is right? I'm not a band director.

by Laura on

It does not work

I retry the page many times and it still does´nt work. I´ve already updated Java Plug In version 8 45 and it still does´nt work.

by Carolina on


I dont know if you are still working on this anymore but this is legitimately the only online tuner that works. You are very smart good job on this man.

by Jacob on


by paige on


How do I get a free tuner

by Javier on

This probably does not work for many of you anymore due to recent security changes for Java Applets. We are working on it to get it fixed. Sorry for the inconvenience.

by Scott on
Pages | 1
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