My S21 is having glitch red underline come while using keyboard

[mones1201]

While i use my key samsung key board in my phone afteafter the recent update i have face issue with red underline which never goes off until i restart the phone i have use google keyboard too same issue.

[dogrotrever]

Hoooobooo

[mones1201]

Lado kha

[Rahul_Radhakrishnan]

The red underline you see is the spell checker/highlight service running in the background. After the recent update, some users reported that it doesn’t clear properly until the phone is restarted. Since it also happens on Gboard, the issue is with the system spell checker, not just the keyboard app.

Try these solutions:

1. Clear cache & data of Samsung Keyboard:

Go to Settings > Apps > Samsung Keyboard > Storage > Clear cache (if problem continues, also Clear data).

2. Check system Spell Checker settings:

Settings > General management > Keyboard list and default > Default keyboard.

Then go to System > Languages and input > Spell checker → try disabling “Spell checker” temporarily, restart keyboard, then re-enable.

3. Update your apps:

Open Galaxy Store → update Samsung Keyboard.

Open Play Store → update Gboard (if you use it).

4. Switch once between keyboards: Sometimes switching to Gboard, typing, then back to Samsung Keyboard resets the spell checker service.

5. Safe mode test: Restart your phone in Safe Mode to see if any third-party app is interfering with spell checker.

If the red underline still won’t go away, it’s likely a known software bug from the latest update. In that case:

Keep your phone updated (Samsung usually fixes such glitches in the next patch).

You can also report it directly from Samsung Members → Get Help > Error reports (attach screenshot and logs).

[mones1201]

Thanks

[mones1201]

Issue is still there brother but not like before i don't why before there was nothing like red underline for so many years even i had disabled everything is can cause red underline but still i am facing same issues but not like before as i did everything you mentioned. Thanks anyways

[Samsung_specialist]

We're sorry to hear about your experience.

To assist you further, follow these steps:
1. Settings > Software update > Download and install > Download > Install now.
2. Go to setting => apps => Samsung Keyboard => storage => clear cache.
3. Open Galaxy Store → update Samsung Keyboard.
4. You can also report it directly from Samsung Members → Get Help > Error reports (attach screenshot and logs).

If the issue persists, please visit a service center for further assistance. You can locate your nearest service center using the link below: https://www.samsung.com/ae/support/service-center/.