Online tuner
Play a note and see how sharp or flat it is. Guitar, bass, ukulele, violin or chromatic, with the sound kept in your tab.
- Nothing is uploaded
- Works offline after first visit
- Open source
- No watermark · limit is your device’s memory; phones hold less
Tunes a guitar, bass, ukulele, violin or any instrument from your microphone, showing the note, the cents and a needle. It is free, and the sound from your microphone is not uploaded: everything runs in your browser on your device. Your browser asks for microphone permission, and after one visit and a short wait the page works offline.
–
Play one string or note
– Hz
Done
Open the network tab. Your files never appear in it.
Add files and run the tool to see every request this tab makes.
Your files are processed on this device and never sent to a server. Reload the page to clear everything from memory.
How it works
- Choose your instrument, or Chromatic for anything else, and press Start the tuner. Allow the microphone when your browser asks.
- Play one string or note and let it ring. The big letter is the note, and the needle shows how many cents sharp (right) or flat (left) it is.
- Turn the peg until the needle sits in the shaded middle and the text says In tune, then move to the next string.
In your browser, not on a server
Your browser opens the microphone (getUserMedia) with its noise suppression and automatic gain turned off, and the Web Audio API hands this page about 85 ms of sound twenty times a second. Each slice is compared with delayed copies of itself (the McLeod pitch method) to find the period of the note, which gives its frequency to a fraction of a hertz; the reading is then dropped. The string buttons play a tone from a Web Audio oscillator.
Compared with upload-based tools: Tuner apps ask for an install and access to much more than the microphone, and many tuner websites are buried in ads and trackers. Here the sound goes from your microphone to this tab and nowhere else, and nothing is kept.
Verify it yourself. Give the page a short while after one visit to save itself for offline use, then turn off Wi-Fi or switch to airplane mode and run the tool again. Or open your browser's developer tools (F12, or Cmd-Option-I on a Mac), pick the Network tab, and watch it while you convert. The panel above does the same count for you.
Questions
Is the sound recorded or uploaded?
No. The pitch is measured by code in this page from the live microphone input, a few times a second, and each reading is thrown away straight after. Nothing is saved, and the audio never leaves this tab.
How accurate is it?
Within a few cents on a clear, sustained note, which is close to the limit of what most ears can hear (a semitone is 100 cents, and the needle counts 5 cents either side as in tune). Let the string ring rather than plucking it repeatedly, and tune in a quiet room: other notes or chatter make the reading jump.
What does A4 = 440 Hz mean? Should I change it?
It is the pitch the whole scale is built from: the A above middle C vibrates 440 times a second. Almost all modern music uses 440. Change it only to match a piano or a recording tuned elsewhere, such as 442 for many orchestras, or 432 if you prefer that tuning.
Why does it jump around on my low strings?
A low string has few vibrations in each moment of sound, and a laptop microphone picks up little bass. Hold the phone or laptop close to the instrument, pluck firmly once and wait a moment for the reading to settle. If the needle never moves, check the microphone with the mic test. For an electric guitar or bass without an amp, a clip-on or pedal tuner will do better.
Can I tune without a microphone?
Yes. With an instrument chosen, press a string button to hear its note for two seconds, then tune your string until the two sound the same and the wobble between them slows to a stop.
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