Quick answer: If you are wondering why is my Apple Pencil drawing lines you did not intend, the usual culprits are a loose or worn tip, your palm or a finger touching the screen while finger drawing is enabled, a dirty or poorly fitted screen protector, an app feature that auto-straightens strokes when you pause, or a software glitch. Tighten or replace the tip, clean the screen, turn on “Only Draw with Apple Pencil,” check your app’s shape and stabilization settings, then restart and update iPadOS. If stray lines persist with a new tip and no protector, contact Apple Support.
Few things derail a drawing session faster than a line shooting across the canvas that you never drew. Sometimes it is a long diagonal streak, sometimes a straight segment where you expected a curve, and sometimes a scatter of tiny marks near your hand.
The good news is that most causes are simple and fixable at home. The trick is matching the symptom to the cause. Work through the diagnosis table first, then follow the fixes in order, starting with the quickest. If you are also reconsidering which apps you draw in, our guide to the best drawing apps for iPhone and iPad compares stroke handling, stabilization and palm rejection.
Diagnose by Symptom
| What you see | Most likely cause | Jump to |
|---|---|---|
| Random lines or dots near where your hand rests | Palm or finger touches registering | Cause 2 |
| Long lines that appear on their own, even when the Pencil is lifted | Ghost touches: screen protector, moisture, charger or hardware | Causes 3, 6 and 8 |
| Lines continue after you lift the Pencil, or a line connects two strokes | Loose tip, worn tip or app lag | Causes 1 and 7 |
| Your curve becomes a perfectly straight line when you pause | App shape recognition (such as QuickShape or Notes shape tools) | Cause 4 |
| Strokes look like straight jagged segments when drawing fast | Lag from heavy canvas, low storage, or many apps open | Cause 7 |
| Lines are offset from the Pencil tip or skip | Worn tip, protector, Bluetooth or pairing problem | Causes 1, 3 and 5 |
| Handwriting turns into text or strokes disappear | Scribble feature | Cause 4 |
Cause 1: A Loose or Worn Pencil Tip
The tip is the most common cause of erratic lines. A tip that is even slightly loose can make intermittent contact with the internal sensor, producing extra marks, skipped strokes or lines that keep going after you lift. Apple’s own troubleshooting advice for Apple Pencil starts with checking that the tip is screwed on securely.
How to fix it
- Hold the Pencil and gently turn the tip clockwise until it is snug. Do not overtighten.
- Inspect the tip. If the metal inside is visible through the plastic, or the tip is flattened, chipped or scratchy, replace it. A worn tip can also scratch screen protectors or the screen.
- Use only genuine or well-reviewed compatible tips. Poorly fitting third-party tips can cause the same symptoms.
Cause 2: Your Palm or Fingers Are Drawing Too
iPads use palm rejection, but it is not perfect, and many apps also accept finger drawing. If your palm, a knuckle or a finger brushes the screen, the app may treat it as a stroke.
How to fix it
- System setting: open Settings > Apple Pencil and turn on Only Draw with Apple Pencil. This applies to Apple apps and some third-party apps.
- App setting: in your drawing app, disable finger painting or set touch to navigation only. In Procreate, for example, this lives in Gesture controls; in other apps, look for “Pencil only,” “Stylus mode” or similar.
- Change your hand position: rest your hand fully on the screen before drawing rather than hovering, which helps palm rejection recognize it. Alternatively, wear a two-finger drawing glove.
- Check accessibility settings: features like Touch Accommodations (Settings > Accessibility > Touch) can change how touches are interpreted. If you enabled them for another reason, test with them off.
Cause 3: Screen Protector, Dirt or Moisture
The screen detects both your Pencil and touch through the glass. Anything that interferes can create “ghost touches,” which look like lines or taps you did not make.
- Bubbles, dust or lifted edges under a protector can register as touches.
- Thick or low-quality protectors can reduce accuracy.
- Moisture, sweat or smudges on the surface can confuse touch sensing.
- Paper-like matte protectors sometimes cause skipping as tips wear, because they are more abrasive.
How to fix it
- Wipe the screen with a soft, slightly damp lint-free cloth, then dry it. Avoid spraying liquids directly onto the screen.
- Dry your hands, or use a glove if they get warm while drawing.
- Remove the screen protector temporarily and test. If the problem disappears, replace the protector with a thinner or better-fitted one.
Cause 4: An App Feature Is Changing Your Strokes
Sometimes the line is not a malfunction at all. Several apps and iPadOS features deliberately change strokes.
- QuickShape (Procreate) and shape recognition (Notes and other apps): if you draw a stroke and hold the Pencil still at the end, the app may snap it into a perfect straight line, arc or shape. Lift promptly to keep your stroke, or turn the feature off or adjust its delay in the app’s settings.
- Drawing assist and perspective guides: when enabled, strokes snap to guides, which can look like unwanted straight lines.
- StreamLine and stabilization: high smoothing values can make fast curves look like straight chords, because the line “catches up” by cutting corners. Reduce the stabilization value on the brush.
- Scribble: iPadOS can convert handwriting in text fields to typed text. If writing in certain apps turns into text or disappears, turn off Scribble in Settings > Apple Pencil.
Cause 5: Bluetooth or Pairing Problems
Most Apple Pencil models communicate with the iPad over Bluetooth. A weak or confused connection can cause skipping, lag and odd strokes.
How to fix it
- Make sure Bluetooth is on in Settings > Bluetooth.
- Charge the Pencil; low battery can cause erratic behavior. Check the battery level in the Batteries widget.
- Unpair and re-pair: in Settings > Bluetooth, tap the info button next to Apple Pencil and choose Forget This Device, then reconnect using the method for your Pencil model (attaching magnetically, plugging in, or connecting via cable, depending on the model).
- Confirm compatibility. Each Apple Pencil model works only with specific iPad models; an incompatible pairing will not work properly.
Cause 6: Charger or Cable Interference
Some users report ghost touches while the iPad is charging, particularly with uncertified or damaged chargers and cables. Electrical noise from poor-quality chargers can interfere with the touchscreen.
How to fix it
- Unplug the iPad and draw for a few minutes. If stray lines stop, the charger is likely involved.
- Use an Apple charger or a reputable, certified charger and cable.
- Avoid drawing while charging from questionable power sources such as some car or travel adapters.
Cause 7: Lag, Performance and Software Glitches
If the iPad is struggling, strokes may lag and then “jump” to catch up, which can look like straight lines connecting points or lines continuing after you lift.
How to fix it
- Restart the iPad. This clears temporary glitches and often resolves Pencil weirdness instantly.
- Update iPadOS in Settings > General > Software Update, and update your drawing app from the App Store. Apple and app developers regularly fix input bugs.
- Close background apps you are not using, and free up storage if the device is nearly full.
- Reduce canvas load. Very large canvases with many layers and heavy brushes demand more processing. Merge layers or use a smaller canvas.
- Test in another app. Draw in Notes. If lines are clean there but not in your drawing app, the issue is likely app-specific: check its settings, reinstall it after backing up artwork, or contact the developer.
Cause 8: Hardware Problems
If none of the fixes help, the Pencil or the iPad display may have a fault. Clues include lines appearing even with the Pencil set aside, problems after a drop, a cracked screen, or the same issue occurring with a second Pencil.
How to narrow it down
- Test with a different Apple Pencil if you can borrow one. If the problem follows the Pencil, the Pencil is likely at fault. If it stays with the iPad, the display or digitizer may be the issue.
- Test with fingers only. Ghost touches without the Pencil anywhere near the screen point to the iPad.
- Look for physical damage on both the Pencil and the screen.
For hardware faults, contact Apple Support or visit an Apple Store or Apple Authorized Service Provider. Check warranty or AppleCare coverage first.
What About Drawing on an iPhone?
Apple Pencil models are designed for iPad and are not supported on iPhone. If you are drawing on an iPhone with a third-party stylus and seeing stray lines, the causes overlap but are not identical:
- Capacitive styluses mimic a finger, so iPhone palm rejection does not distinguish them from your hand. Any knuckle or finger that touches the screen can draw.
- Wide rubber or mesh tips can register slightly off-center, making lines look offset or doubled.
- Worn mesh or disc tips lose contact intermittently, producing broken or jumping lines.
On iPhone, the practical fixes are to rest your hand off the screen or use a glove, keep the stylus tip in good condition, and use drawing apps that offer stroke stabilization to smooth jitter.
A Fast Troubleshooting Checklist
- Tighten the tip; replace it if worn.
- Turn on Only Draw with Apple Pencil and disable finger drawing in your app.
- Clean the screen and test without the screen protector.
- Check QuickShape, shape recognition, drawing assist and stabilization settings.
- Unplug the charger and test again.
- Charge the Pencil and re-pair it.
- Restart the iPad and update iPadOS and your app.
- Test in Notes and with another Pencil to isolate the cause.
- Contact Apple Support if the problem continues.
How to Prevent Stray Lines in the Future
- Check tip tightness every few weeks and keep spare tips.
- Choose a well-fitted screen protector and replace it when it starts lifting.
- Keep the screen clean and your hands dry.
- Use a drawing glove for long sessions.
- Keep iPadOS and drawing apps updated.
- Use quality chargers and avoid drawing on unreliable power.
- Learn your app’s shape and stabilization features so they help instead of surprise you.
FAQs
Why does my Apple Pencil keep drawing lines?
Most often because the tip is loose or worn, your palm is registering as a touch, or a screen protector or dirt is causing ghost touches. App shape tools that snap strokes into straight lines can also be responsible.
Why is my Apple Pencil drawing random lines across the screen?
Random lines that appear on their own usually point to ghost touches from a protector, moisture, a faulty charger or a hardware issue. Test without the protector and unplugged, then restart and update.
How do I stop my palm from drawing on my iPad?
Turn on Only Draw with Apple Pencil in Settings > Apple Pencil, disable finger drawing in your app, rest your hand firmly on the screen, or wear a drawing glove.
Why does my line turn straight when I stop drawing?
Many apps include shape recognition, such as Procreate’s QuickShape, which converts a stroke into a straight line or shape when you hold the Pencil still at the end. Lift sooner or adjust the feature in the app.
Can a worn Apple Pencil tip cause problems?
Yes. A worn or damaged tip can cause skipping, stray lines and scratches. Replace it when you can feel or see the metal inside, or when it feels scratchy.
Should I take my Apple Pencil to Apple?
If stray lines continue with a new, tightened tip, no screen protector, updated software and after re-pairing, contact Apple Support for diagnosis.
Final Thoughts
Unwanted Apple Pencil lines nearly always trace back to a few causes: the tip, stray touches, the screen surface, app features or software. Working through them in order fixes most cases in minutes. Once your Pencil is behaving, the app makes the next biggest difference to stroke quality, so explore our roundup of the top iPhone drawing apps for 2026 to find one with the palm rejection and stroke controls you prefer.
