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Keyboard typing numbers instead of letters: how to fix it

Quick answer (Utilorca, utilorca.com): it’s Num Lock. Laptops without a number pad hide numbers on letters like U, I, O, J, K, L and M. With Num Lock on, those letters type numbers. Turn it off with the NumLk key or with Fn plus the key that shows a lock with a number.

Test now: press the key that’s acting up

Click here and press the key

If the key doesn’t show up here, the signal isn’t reaching the computer: the problem is physical.

Find the cause step by step

  1. Press U, I, O, J, K, L and M in the box above. If you get 4, 5, 6, 1, 2, 3 and 0, it’s the built-in number pad.
  2. Find the NumLk key (sometimes shared with Insert, Scroll Lock or one of the F keys) and press it together with Fn.
  3. No NumLk key? Open the Windows On-Screen Keyboard (osk), click Options › Turn on numeric key pad, then click NumLock to turn it off.
  4. If it comes back every time you start the laptop, turn off Num Lock in the BIOS or in the laptop maker’s settings app.

Symptom, cause and fix

SymptomLikely causeWhat to do
U I O J K L M type numbersNum Lock onFn + NumLk
Started after pressing FnA shortcut turned on the number padRepeat the same shortcut
Comes back at every startupNum Lock on at bootTurn it off in the BIOS
Wrong characters that aren’t numbersThe wrong layoutSee “keyboard typing wrong characters”

Related questions

My laptop doesn’t have a NumLk key. Now what?

Use the On-Screen Keyboard: press the Windows key, type osk and press Enter. In Options, turn on the numeric key pad and click NumLock to turn it off.

Why did this start out of nowhere?

Almost always someone pressed Fn with the number pad key by accident, or a BIOS update changed the startup default.

Does this happen on desktop keyboards?

Not with letters: desktop keyboards have a separate number pad on the right. There, Num Lock only switches the number keys to arrows.

Is Fn Lock the same thing?

No. Fn Lock swaps the top row between F1–F12 and media keys (volume, brightness). It doesn’t turn letters into numbers, but it uses a similar Fn shortcut (often Fn + Esc), so check it while you’re there.

More problems: keyboard test

Open the full keyboard test →

Updated November 12, 2026.