tuneguitar.

LESS TUNING. MORE PLAYING.

Check your guitar’s intonation.

Open notes can be right while fretted notes drift.

Tune open strings first. Fit your capo, then switch on “Check with capo on”.

StandardE A D G B E
REFERENCE TONEA4 = 440 Hz
E2
E · 6th string82.41 Hz

Choose a string below to hear its note.

PLAY A STRINGThickest Thinnest
6 strings · 3 seconds each
Sound & advanced settings

A gentle ping follows a steady note within 5 cents. Its volume follows the sound slider. Microphone audio stays on your device.

Check your intonation.

Compare one open string with the same string pressed at fret 12. Remove your capo and mute the other strings.

  1. 1. Tune and measure the open string
  2. 2. Press at fret 12 and measure again

Press just behind fret 12 with normal pressure. Do not play a harmonic. Repeat the comparison to confirm the result.

Check your six strings.

Press start, then sweep gently across all six open strings, from thickest to thinnest. Let them ring together.

Experimental: overlapping notes can be unclear. Select any result to measure that string alone in this window.

Check a known reference.

Play a steady reference from another device or instrument whose frequency you know. Enter that frequency below.

This compares your input with the reference you supply. It is not a certified calibration. Only numbers are saved, never audio.
Acoustic, electric & classicalFree. No download. Just play.

By ear: click a note, match your string, then move to the next. Keyboard: 1–6 to play · Esc to stop

A BETTER GUITAR SETUP

What this check measures

The fretted note at the 12th fret should sit one octave above the open string. The tool first measures a correctly tuned open string, then compares the fretted pitch against twice that measured frequency.

Keep the comparison consistent

Remove your capo. Mute neighbouring strings and use normal fretting pressure. Measure the same string twice, then repeat the whole comparison. Pressing too hard, old strings or an unstable note can change the result.

What the result means

A positive difference means the fretted note is sharp relative to the open note. A negative difference means it is flat. A persistent difference may point to an instrument setup issue. This check cannot identify the cause or decide which adjustment your guitar needs.

Further reading: Sam Ash: understanding guitar intonation

Explore all guitar tuning tools

KNOW YOUR TUNING

Standard: E A D G B E

Tune the open strings with the capo off. Start at the thickest string, work across, then give all six one more check.

The table shows the open-string setup at A4 = 440 Hz. For capo pitches, use the capo controls above.

Standard notes and frequencies from thickest to thinnest
StringNoteHzFrom standard
6 · thickestE282.41E2
5A2110.00A2
4D3146.83D3
3G3196.00G3
2B3246.94B3
1 · thinnestE4329.63E4

THE TUNEGUITAR GUIDE

Use the result with confidence

TuneGuitar guide · Updated 6 October 2026 · How we prepare our guides

A harmonic is not the fretted test

The natural harmonic near fret 12 and the note pressed at fret 12 are produced differently. This tool asks for the fretted note because your hand pressure and the instrument's fretted geometry are part of the comparison. Playing a harmonic instead can supply a reassuring octave without testing the behaviour you intended to examine.

Repeat before interpreting

Measure an open string and its fretted octave three times with normal pressure. Try lighter pressure as a separate experiment. A positive result means the fretted frequency exceeds twice the measured open frequency; it does not prescribe a saddle movement. Keep the observations separate from a repair decision, which depends on bridge design, strings and setup.

How to tune a guitar: a repeatable two-pass routineWhy your guitar tuner jumps, hears nothing or finds the wrong octaveCents, hertz and calibration: what TuneGuitar's numbers mean

READY FOR THE FIRST CHORD

Tune for a song.

Search 100 song setups by title or artist.

Browse all 100 songs →

GOOD TO KNOW

Using this tuning tool

Do I need to tune the open string before checking intonation?

Yes. Establish the open target first, then compare the same string fretted at the twelfth fret. That fretted note should be an octave higher. Keep your fretting pressure consistent so the comparison reflects a repeatable playing condition.

Is the twelfth-fret harmonic the same test as a fretted note?

No. The harmonic checks an overtone of the open string, while a fretted note includes the effect of pressing the string onto the fret. A correct harmonic does not establish that the fretted note is correct.

Should I adjust a saddle after one sharp reading?

Repeat the comparison with gentle fretting pressure and stable plucks first. String condition and instrument setup can also affect it. The tool reports a pitch difference; it cannot inspect the bridge or prescribe a mechanical adjustment for your particular guitar.

Privacy & cookies

Your guitar audio is processed entirely on your device. We do not record it, store it or upload it.

Saved guitars, setlists and your ping preference are stored in this browser on this device. You can delete each guitar in “My guitars”. Clearing site data removes these settings and the offline cache. The offline cache contains the tuner’s pages and the code that generates reference tones, never microphone recordings.

Google Analytics (G-G2RC12Y00X) loads only after you accept analytics cookies. It measures visits and usage; microphone audio is never sent to Google. Use Cookie settings in the footer to accept or withdraw consent. Analytics cookies and your choice last up to six months. Advertising uses separate consent settings. The hosting service may process routine connection data to deliver and secure the site.

This site includes the Google AdSense publisher tag. It contacts Google to connect this site to AdSense and load any consent messages published for the site. Advertising is subject to Google’s review and the publisher’s ad and consent settings. Analytics consent does not grant advertising consent. When Google’s advertising consent message is available, use Ad privacy settings in the footer to revisit it. No microphone audio is shared with AdSense.

Last updated 13 September 2026.

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My guitars

Save the current strings, capo setup, reference sound and concert pitch for your guitar. No account needed.

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Saved only in this browser. Up to 20 guitars.

Share this tuning

This link includes your strings, capo, reference pitch and tuning mode.

Copy the link, then paste it into a message.

Keep your tuner close.

Use your browser’s menu and choose Install app or Add to Home Screen. On iPhone or iPad, open this page in Safari, tap Share, then Add to Home Screen.

Once the tuner shows “Ready offline”, reference tones and microphone tuning work without a connection. Microphone permission is still required.

Your own tuning.

Enter 4 to 12 notes in physical string order, from the thickest side. Include the octave, for example E2 A2 D3 G3 B3 E4. Use notes suitable for your strings and instrument.

Save your setup in My guitars, or share its link.

Your setlists.

A setlist keeps songs in playing order, with the tuning and capo for each one. Open a song’s setup in the tuner when you are ready to play.

Create your first setlist

Give your practice session a name, then add songs.

Create a setlist to start adding songs.

    Saved in this browser. Up to 10 setlists with 30 entries each. Shared lists open for review before saving.

    Your lists stay on this device. Songs are not played automatically.

    Share a correction.

    Describe the guitar part or version, the correct tuning and a source. You can copy or share the report with the site owner. It is not submitted automatically.