Palindrome Checker
Palindrome Checker
Enter a word, name, or phrase to check whether it's a palindrome — text that reads the same forwards and backwards once spaces, punctuation, and capitalization are ignored.
The check works by lowercasing the input and stripping out anything that isn't a letter or number, then comparing the cleaned result to its own reverse — which is exactly why phrase-level palindromes like "A man, a plan, a canal: Panama" count as valid even though the raw text (with spaces, capitals, and punctuation intact) obviously doesn't look identical when read backward. Classic single-word examples include "racecar" and "level," while numeric palindromes like "12321" work under the same rule since digits are treated the same way as letters.
- How it works: the text is lowercased and stripped of anything that isn't a letter or number, then compared to its own reverse.
- Classic examples: "racecar", "level", "A man, a plan, a canal: Panama", and "12321" are all palindromes.
- Spaces and punctuation don't break a palindrome — only the letters and numbers matter.
Does capitalization matter?
No — "Racecar" and "RACECAR" are both correctly identified as palindromes since the check is case-insensitive.
Can numbers be palindromes too?
Yes — a sequence like "12321" is checked the same way as text, since digits are included in the comparison.
Palindrome Checker
Enter a word, name, or phrase to check whether it's a palindrome — text that reads the same forwards and backwards once spaces, punctuation, and capitalization are ignored.
The check works by lowercasing the input and stripping out anything that isn't a letter or number, then comparing the cleaned result to its own reverse — which is exactly why phrase-level palindromes like "A man, a plan, a canal: Panama" count as valid even though the raw text (with spaces, capitals, and punctuation intact) obviously doesn't look identical when read backward. Classic single-word examples include "racecar" and "level," while numeric palindromes like "12321" work under the same rule since digits are treated the same way as letters.
- How it works: the text is lowercased and stripped of anything that isn't a letter or number, then compared to its own reverse.
- Classic examples: "racecar", "level", "A man, a plan, a canal: Panama", and "12321" are all palindromes.
- Spaces and punctuation don't break a palindrome — only the letters and numbers matter.
Does capitalization matter?
No — "Racecar" and "RACECAR" are both correctly identified as palindromes since the check is case-insensitive.
Can numbers be palindromes too?
Yes — a sequence like "12321" is checked the same way as text, since digits are included in the comparison.