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Palindrome Checker

Details

How to use Palindrome Checker

What the tool does, how to run it, and what to expect from the result.

How to check whether a word or phrase is a palindrome

Type the word, phrase, or number into the input box. It is lowercased, everything except letters and digits is stripped, and the result is compared with its own reverse.

The verdict appears immediately along with the number of characters that were actually compared. That second figure is the one to watch, because it tells you how much of what you typed survived the cleanup and therefore whether the answer is about the phrase you meant.

  • Type or paste the candidate word, phrase, or number into the box.
  • Read Is a palindrome for the Yes or No verdict.
  • Check Compared characters against the length of your input to see how much was stripped.
  • If accented letters were dropped, retype them as plain letters and check again.
Tips

Getting a better result out of Palindrome Checker

Specific settings and thresholds, not general advice.

  • Before comparing, the input is lowercased and every character that is not a to z or 0 to 9 is deleted. Spaces, punctuation, and case never affect the answer, so "A man, a plan, a canal: Panama" is reported as a palindrome.
  • That filter is ASCII only, so accented letters are deleted rather than folded to their base letter. The French palindrome "Ésope reste ici et se repose" is reported as not a palindrome, because the leading accented E is thrown away instead of becoming an e.
  • Cyrillic, Greek, Arabic, and CJK characters are removed entirely. A palindrome written in any of those scripts leaves nothing behind to compare, so the tool answers "Enter text" as though the box were empty.
  • Digits survive the filter, so numeric palindromes work: 12321 passes, and a date such as 02/02/2020 becomes 02022020 and also passes.
  • The Compared characters figure tells you how many characters survived normalisation. If it is far lower than what you typed, characters you care about were dropped and the verdict is about a shorter string than you think.
Limits

What Palindrome Checker does not do

The honest boundary, so you do not lose time finding it yourself.

  • There is no strict mode that compares the exact string including spaces, case, and punctuation.
  • It folds nothing: no Unicode normalisation, no accent folding, no transliteration.
  • It does not check word-level palindromes, where the words rather than the letters read the same in reverse.
  • It does not find the longest palindromic substring inside a larger text, it only judges the whole input.
At a glance

Who Palindrome Checker is for

A quick way to understand who this helps, what it solves, and where it connects next.

Best fit

Writers, students, editors, marketers, and developers working with text.

Ideal for

Quick, private text work without installing an app or trusting a server with your content.

FAQ

Common questions

Short answers for the questions people usually have before trying a utility like this.

Does my data get uploaded anywhere?

No. Everything runs locally in your browser and nothing is sent to a server.

Is this free to use?

Yes. It is completely free, with no account, no signup, and no usage limits.

Does it work on a phone?

Yes. The page runs in any modern mobile browser, on iPhone and Android alike, with no app to install.

Why is my accented palindrome rejected?

Only the letters a to z and the digits 0 to 9 survive the cleanup, so an accented letter is dropped rather than converted to its unaccented form. That removes a character from one end of the phrase and the two halves stop matching. Replace accented letters with their base letters before checking.

Does it work in Russian, Greek, or Chinese?

No. Characters outside the basic Latin alphabet and the digits are stripped out, so text in those scripts reduces to an empty string and the tool reports "Enter text". It is a Latin-alphabet checker.

Can I check a number or a date?

Yes. Digits are kept, so 12321 is confirmed as a palindrome, and a date reduces to its digits, so 02/02/2020 becomes 02022020 and reads the same in both directions.

What definition of palindrome is used?

The common one: ignore case, spaces, and punctuation, and compare only letters and digits. That is why a phrase palindrome passes here even though the raw string with its commas and spaces is not symmetrical.

Will it find a palindrome hidden inside a longer sentence?

No. It judges only the whole input after cleanup. If you want to test a fragment, paste only that fragment into the box.

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