Palindrome Checker
"A man, a plan, a canal: Panama" — check any word, sentence or number, with punctuation and case ignored the way the puzzle intends.
Famous palindromes
- "Never odd or even"
- "Was it a car or a cat I saw?"
- "No lemon, no melon"
- "Mr. Owl ate my metal worm"
- racecar · level · rotator · kayak · noon
- 12321 · 2002 · 11/02/2011 (a palindromic date)
Frequently asked questions
Do spaces and punctuation count?
By convention, no — sentence palindromes ignore everything except letters and digits, and ignore case. Tick strict mode if you want a character-exact check instead.
What's the longest single-word palindrome?
In English dictionaries, "tattarrattat" (a knock on the door, coined by James Joyce) at 12 letters; "detartrated" (11) is the longest with a straight face. Finnish beats both with "saippuakivikauppias" — a soapstone seller, 19 letters.
Why do programmers love palindromes?
Reversing a string is a classic first exercise, and "check if it's a palindrome" is a staple interview warm-up — the polished answer skips the copy and compares characters from both ends inward.
Last updated: 2026-07-13