Tightening a guitar string means turning the tuning peg until the string reaches the pitch you want
Every guitar string has a tuning peg (also called a tuning machine or tuning key) at the headstock — the part of the neck closest to your head. Turning that peg winds the string tighter, which raises the pitch. Turning it the opposite way loosens the string and lowers the pitch. The string itself does not move; the peg winds or unwinds the slack around a post.
Most guitars have six strings, and each one has its own peg. On acoustic and electric guitars, the pegs are usually arranged three on each side of the headstock, though some designs put all six on one side. The string connects to the peg post, so when you turn the peg handle, the post rotates and wraps more string around itself, pulling the string tighter.
Key Takeaways
- Turn the tuning peg clockwise to tighten a string and raise its pitch, or counterclockwise to loosen it and lower the pitch.
- Use a tuner — a small device that listens to the string and tells you when it matches the correct pitch — to know when to stop turning.
- Turn the peg slowly and in small increments, because the pitch changes quickly and overshooting is straightforward to do.
- If a string feels too tight or sounds wrong after tuning, check that it is wound correctly around the post and that the bridge is seated properly.
Which direction to turn the tuning peg
The direction depends on which string and which side of the headstock the peg is on. A general rule: if you are looking at the headstock from the front of the guitar (the way you see it when you play), turning the peg handle toward the center of the headstock usually tightens the string. Turning it away from the center loosens it. But this reverses on some guitar designs, so the safest approach is to turn slowly and listen.
Start by turning the peg a quarter turn and pluck the string. If the pitch goes up, you are tightening it. If the pitch goes down, you are loosening it. Once you know which direction raises the pitch, you can turn with confidence. Most people find it easier to remember the direction for each string after tuning a few times.
Using a tuner to find the right pitch
A tuner is a small device that listens to the string and displays whether the pitch is too low, too high, or correct. You can buy a clip-on tuner (clips to the headstock), a pedal tuner (sits on the floor), or use a tuner app on your phone. Clip-on tuners cost between $10 and $30 and work on acoustic and electric guitars.
Attach the tuner or open the app, pluck the string you want to tune, and watch the display. Most tuners show a needle or a light that moves toward the center when the pitch is correct. Turn the tuning peg slowly until the needle centers or the light turns green. Pluck the string again to confirm it stayed in tune — sometimes the pitch drifts slightly after you stop turning.
If you do not have a tuner, you can tune by ear, but it takes practice. Pluck a string and listen to its pitch, then compare it to a reference — a piano, another instrument, or a tuning fork. This method is slower and less accurate, especially for beginners.
How to avoid breaking or damaging the string
Turn the peg slowly. The pitch changes quickly, and if you turn too far, the string can snap from the sudden tension. New strings are more likely to break because they have not settled yet. If you feel the string getting very tight and the pitch is already correct, stop turning when ready.
Make sure the string is wound correctly around the post before you start tuning. The string should wrap around the post two or three times, with each wrap below the previous one. If the string is wound loosely or unevenly, it will not hold tension properly and may slip out of tune. If you are restringing the guitar, wind the string neatly before you tune it up.
Check that the bridge — the piece that holds the strings at the body of the guitar — is seated properly and not tilted. On acoustic guitars, the bridge is glued to the top. On electric guitars, it may be adjustable. If the bridge shifts when you tighten a string, the guitar can be damaged. If you notice the bridge moving, loosen the string and reposition the bridge before tuning again.
Tuning all six strings in order
Standard tuning for a six-string guitar, from the thickest string to the thinnest, is E, A, D, G, B, E. The thickest string is the low E, and the thinnest is the high E. Tune them in this order: start with the low E (the thickest string on the headstock), then A, D, G, B, and finally the high E.
Tuning in order helps because each string affects the tension on the neck. If you tune one string very tight and then tune the others, the first string may drift out of tune. By tuning all six in sequence, you distribute the tension more evenly. After you finish, go back and check the low E again — it often drifts slightly while you are tuning the others.
If a string is very far out of tune (the pitch is much lower or higher than it should be), turn the peg in larger increments at first, then slow down as you get close. This saves time and reduces the risk of overshooting.
What to do if a string will not stay in tune
If a string keeps going flat (getting lower in pitch) after you tune it, the string may be slipping around the post. Loosen the string slightly, make sure it is wound tightly and evenly around the post, and tune it again. If it still slips, the tuning peg itself may be worn out and need replacement.
A new string will drift out of tune for the first few hours after you put it on, because the string is still settling and stretching. Tune it, play it for a few minutes, and tune it again. Repeat this two or three times. After that, it should hold pitch much more steadily.
If the string sounds wrong even when the tuner says it is in tune — for example, it sounds muted or buzzes — the problem is usually not the tuning peg. Check that the string is not touching the frets (the metal lines on the neck) or the bridge. If it is, the string may be wound incorrectly or the guitar may need adjustment by a technician.
Frequently Asked Questions
Can I tune a guitar without a tuner?
Yes, but it is harder. You can tune by ear if you have a reference pitch — a piano, another instrument, or a tuning app that plays the correct pitch. Pluck the string and adjust the peg until the pitch matches the reference. This method works but takes practice and is less accurate than using a tuner.
What happens if I turn the tuning peg too far?
The string will become very tight and may snap. If you hear the pitch getting very high and the tuner shows it is already correct, stop turning when ready. If the string breaks, you will need to replace it. New strings are more prone to breaking because they have not settled yet.
Why does my guitar go out of tune so quickly?
New strings take time to settle and will drift for the first few hours. Older strings may be worn out or the tuning pegs may be loose. If the bridge is not seated properly, the strings will also go out of tune quickly. Check that the bridge is straight and that the tuning pegs are tight.
Do I need to tune every time I play?
Most guitars need tuning before each playing session, especially if they have been sitting for a few days. Temperature and humidity changes affect the wood and strings, which causes the pitch to drift. A quick check with a tuner takes less than a minute and makes a big difference in how the guitar sounds.
What is the difference between a clip-on tuner and a tuner app?
A clip-on tuner attaches to the headstock and reads vibrations from the guitar itself, so it works even in noisy rooms. A tuner app on your phone listens through the microphone, which can pick up background noise and give inaccurate readings. Clip-on tuners are more reliable and cost $10 to $30.