Palindrome Checker
Check if text reads the same forwards and backwards
Try these examples
About the Palindrome Checker
This palindrome checker tests whether a word, phrase or number reads the same in both directions, ignoring spaces, punctuation and capitalisation. That normalisation is what lets phrase palindromes such as "A man, a plan, a canal: Panama" register correctly rather than failing.
A palindrome checker tests whether text reads identically forwards and backwards. Single words such as level, radar and racecar are the obvious cases, but the interesting ones are phrases — and those only work once spaces, punctuation and case are set aside.
That normalisation is the whole trick. "A man, a plan, a canal: Panama" is a palindrome only if commas, the colon, the spaces and the capital letters are ignored; compared literally it fails immediately. The same applies to "Madam, I'm Adam" and "Never odd or even".
Numeric palindromes work the same way and turn up in puzzles and programming exercises, where reversing an integer and comparing it is a common interview question.
How to use the Palindrome Checker
- Enter your text. Type a word, phrase or number.
- Read the verdict. See immediately whether it reads the same both ways.
- Check the normalised form. See the text with spaces, punctuation and case removed.
- Try a variation. Adjust the wording and test again.
Palindrome Checker features
- Tests words, phrases and numbers
- Ignores spaces, punctuation and case
- Shows the normalised comparison
- Instant verdict as you type
- Handles accented characters
- Runs entirely in your browser
Frequently asked questions
Does it ignore spaces and punctuation?
Yes. Spaces, punctuation and case are ignored, which is what allows phrase palindromes to register.
Can it check a whole sentence?
Yes. Sentences such as "A man, a plan, a canal: Panama" are correctly identified as palindromes.
Does it work with numbers?
Yes. Numeric palindromes such as 12321 are tested the same way.
What is the longest single-word palindrome?
In English, "tattarrattat" from Ulysses is often cited; "racecar" and "level" are the everyday examples.
Is anything uploaded?
No. The check runs entirely in your browser.