Check whether text or numbers read the same forward and backward.
Updated
Palindrome
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In-depth guide
A palindrome reads identically forwards and backwards — "racecar", "madam", or the phrase "A man, a plan, a canal: Panama". This tool tests words, phrases and numbers for palindrome symmetry, ignoring case and punctuation, all in your browser.
The tool first normalises the input: it lowercases the text and removes everything that is not a letter or digit, so spaces and punctuation do not break the symmetry. It then compares the cleaned string against its reverse. If they are equal, the input is a palindrome. This is why "Was it a car or a cat I saw?" passes despite the punctuation and mixed case.
Palindromes are a staple of programming exercises and technical interviews, where the two-pointer or reverse-and-compare solution is a rite of passage. They also appear in puzzles, recreational maths (palindromic primes and dates), and as a simple way to teach string indexing and normalisation.
The check runs entirely in your browser — nothing is uploaded. A single character is trivially a palindrome, and an empty input has no characters to mismatch. Accented characters are compared as written rather than folded to their base form.
Yes. Only letters and digits are kept, so "A man, a plan, a canal: Panama" is recognised as a palindrome.
Yes. The input is lowercased before checking, so mixed case does not break the symmetry.
Yes. Numeric strings such as 12321 are supported and checked the same way as text.
The normalised string is compared against its own reverse; if they match exactly, the input is a palindrome.
Yes. A one-character string reads the same forwards and backwards, so it always passes.
No. Accented characters are compared as written rather than reduced to their base letter.
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