Text Tools
Palindrome Checker
Check palindromes both ways: classic loose rules and strict.
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◉ Runs on this device
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TOOL PALINDROME-C
What this tool does
About the palindrome checker
First-mismatch shown, conventions explained.
How to use it
- Enter the phrase.
- Read both verdicts (loose ignores case/punctuation).
- Non-palindromes show the first mismatch.
- Compose your own; the mismatch pointer is the editor.
Useful for
- Verify a candidate palindrome properly.
- Teach the loose-vs-strict distinction.
- Settle wordplay disputes with a referee.
Straight answers
Palindrome Checker FAQ
Is “A man, a plan, a canal: Panama” really a palindrome?
Under the classic convention, yes — letters only, case-blind, punctuation invisible. Character-strict palindromes (noon, level) pass both tests; the page shows both so every argument has its ruling.
Longest known palindromes?
Word-level: “Was it a car or a cat I saw?” territory; constructed letter-level ones run thousands of words and read like fever dreams. Quality and length trade off steeply.