Palindrome Checker

A palindrome reads the same forwards and backwards, such as 'racecar', '12321', or 'level'. With the default settings the tool ignores case, spaces, and punctuation, so full phrases like 'A man, a plan, a canal: Panama' are recognized as palindromes too.

It shows the exact string the tool actually reversed and matched after applying your options. For 'A man, a plan, a canal: Panama' that string is 'amanaplanacanalpanama', which makes it easy to see why the answer came out the way it did.

Untick the boxes you want to enforce. Turn off Ignore case to make capitals matter, and turn off Ignore punctuation to require every symbol and space to mirror. With all three off, only text that is a perfect character-for-character reverse counts.

When Ignore punctuation is on, it already removes spaces along with every other non-letter and non-number character, so the Ignore spaces box has no extra effect. Ignore spaces matters only when Ignore punctuation is off, in which case it strips whitespace but keeps punctuation.

Yes. An empty string, or one that becomes empty after spaces and punctuation are stripped, reads the same in both directions by definition, so the tool treats it as a palindrome. The result banner appears once you have typed some non-space text.

Yes. Digits are kept during normalization, so numeric palindromes like '12321' or a formatted value such as '1,234,321' with punctuation ignored are checked correctly.

They are handled properly. Text is Unicode normalized first, letters and numbers from any script are kept, and the reversal works on whole code points, so accented letters, non-Latin scripts, and emoji are never split into broken halves.

There is no fixed limit. The check runs in your browser, so the practical ceiling is your device's memory, and even long paragraphs are tested instantly as you type.

Yes. Everything runs locally in your browser. Nothing you type is uploaded, logged, or stored on any server.