How to Turn On Shake to Undo on iPhone

Shake to Undo is a handy iPhone accessibility feature that lets you reverse your last action—like typing, deleting, or formatting—by simply shaking your device. This guide walks you through enabling it, using it effectively, and fixing common issues. No prior setup is needed beyond your iPhone’s Settings app.

What You’ll Need

• An iPhone running iOS 9 or later (the steps are the same for recent versions).
• Access to the Settings app (pre-installed).

Step-by-Step

1. Open the Settings app. Tap the gray gear icon on your home screen or in your App Library.
2. Tap “Accessibility.” Scroll down the Settings menu and select it (it’s usually in the third group of options).
3. Tap “Touch.” Under the “Physical and Motor” section, you’ll find “Touch.” Tap it.
4. Find “Shake to Undo.” Scroll down the Touch settings until you see the toggle labeled “Shake to Undo.” It’s typically near the bottom, below “Call Audio Routing” and “Keyboards.”
5. Turn on the toggle. Tap the switch so it turns green. That’s it—the feature is now active.
6. Test it. Open any app where you can type (like Notes or Messages), type a few words, then give your iPhone a quick, firm shake. An undo dialog should appear.

Common Mistakes

• Shaking too gently. A subtle wiggle won’t trigger the motion sensor. Give it a firm, quick shake—like you’re trying to shake a pen.
• Shaking in the wrong direction. The iPhone’s accelerometer detects any direction, but a side-to-side or up-and-down shake works best. Avoid slow, circular motions.
• Looking for the setting in the wrong place. Some users search for “Shake to Undo” under “General” or “Keyboard” settings. It’s exclusively under Accessibility > Touch.
• Confusing it with the Redo option. After you shake and tap “Undo,” you may see a “Redo” button appear briefly. That’s separate—shake again to undo the undo, not to redo your last action.

Tips

• Use it in any text field. Shake to Undo works in nearly every app that uses the standard keyboard—Notes, Messages, Mail, Safari, and third-party apps like WhatsApp or Twitter.
• It undoes more than typing. It can also revert formatting changes, paste operations, and even some editing actions in apps like Photos (e.g., reverting a crop).
• Shake to Undo is not limited to text. In some apps, it can undo actions like deleting a photo or moving a file, but this depends on the app’s support.
• If you accidentally trigger it, just tap “Cancel” on the dialog—no harm done.
• For faster undo, consider using three-finger swipe left on the keyboard, but that requires a different gesture and may not be as intuitive.

Troubleshooting

Shake to Undo isn’t working. First, confirm the toggle is on in Settings > Accessibility > Touch. If it is, try restarting your iPhone (press and hold the side button and either volume button, then slide to power off). If it still doesn’t work, check if the app you’re using supports it—some apps disable the feature. Also, make sure your iPhone’s motion sensors are working by testing other motion features like screen rotation.

The dialog appears but Undo does nothing. This can happen if there’s nothing to undo—for example, you just opened the app and haven’t typed anything. Or the app may not support undoing that specific action. Try typing a few characters and then shaking again.

Shake to Undo triggers too easily. If you find it popping up accidentally, you can turn it off via the same toggle. Alternatively, adjust your grip or use a case that dampens motion. There’s no sensitivity setting, so disabling is the only way to stop accidental triggers.

After an iOS update, it stopped working. Occasionally, updates reset accessibility settings. Go back to Settings > Accessibility > Touch and re-enable the toggle.

Frequently Asked Questions

Does Shake to Undo work on all iPhone models?

Yes, it works on any iPhone running iOS 9 or later, including all models from iPhone 6s onward. It relies on the built-in accelerometer, which all iPhones have.

Can I use Shake to Undo in third-party apps?

Most apps that use the standard text input system support it. However, some apps—especially games or custom text editors—may disable it. You’ll know if the dialog doesn’t appear.

What’s the difference between Shake to Undo and the three-finger swipe?

Three-finger swipe left is a newer gesture that also undoes, and three-finger swipe right redoes. Shake to Undo is an older, more accessible option. Both work, but the three-finger gesture is faster and less disruptive.

Can I undo more than one action with Shake to Undo?

No, each shake undoes only the most recent action. To undo multiple steps, you’d need to shake repeatedly, but most apps only support one level of undo via this method.

Does Shake to Undo work with Apple Pencil?

Yes, if you’re using an iPad with an Apple Pencil, shaking the iPad will still trigger the undo dialog. However, on iPad, you can also use the two-finger tap on the screen to undo, which is often more convenient.

Is there a way to make the undo dialog appear without shaking?

Yes, you can use the three-finger swipe left gesture (on iOS 13 and later) or tap the undo arrow in the keyboard bar (if available). Some apps also have an undo button in their toolbar.

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