Palindrome Checker

All tools

Check whether any word, phrase or number reads the same backwards, with live symmetry highlighting, accent/case/punctuation options, a reverse-text view and the longest palindrome found inside.

Matching options
Try an example
Type something to check
Checked as –

Symmetry view

Each character is compared with its mirror from the other end — matching pairs are highlighted, mismatches are marked.

Your text will be mapped here, character by character.
Matching pair Mismatch Longest palindrome

Reversed text

–
0
Characters
0
Compared
0
Words
Longest palindrome inside: —

What counts as a palindrome?

A palindrome reads the same forwards and backwards. It can be a single word, a whole sentence, a number or even a name.

Word
A single word that is symmetrical, such as “level”, “kayak” or “rotor”.
Sentence
A phrase that is symmetrical once spaces, case and punctuation are ignored, like “A man, a plan, a canal: Panama”.
Number
A number whose digits are the same reversed, such as 1221 or 90 909.
Name
Names can be palindromes too — “Hannah”, “Anna” or “Otto”.

About this checker

This palindrome checker works entirely in your browser. Toggle whether to ignore capitalization, spaces, punctuation and accents, then watch each character get compared with its mirror in real time. It also reverses your text and finds the longest palindrome hidden inside it.

Nothing you type is uploaded — all checking happens locally on your device.

Frequently asked questions

A palindrome is a word, phrase, number or sequence that reads the same backwards as forwards, such as “racecar” or “Never odd or even”.

By default this tool ignores spaces, punctuation, capitalization and accents, so phrases like “A man, a plan, a canal: Panama” are recognised. Turn the options off for a strict, character-for-character check.

Yes. A numeric palindrome has digits that are identical when reversed, for example 1221, 7 and 90 909.

The tool scans your text and highlights the longest run of characters that forms a palindrome, even when the whole text is not one.

Completely. The checker runs in your browser and never sends what you type to a server.

About Palindrome Checker

The palindrome checker tests whether a word, phrase or number reads the same backwards as forwards. As you type, it compares each character with its mirror from the other end in a live symmetry view, highlighting matching pairs and marking mismatches.

Three toggles control how strict the comparison is: ignore capitalization, ignore spaces and punctuation, and ignore accents. With all three on — the default — classic sentence palindromes like “A man, a plan, a canal: Panama” pass; turn them off for a strict character-for-character check.

It also reverses your text, counts characters and words, and scans for the longest palindrome hidden inside a non-palindromic text. Everything runs locally in your browser, so nothing you type is uploaded.

How to use Palindrome Checker

  1. Type or paste a word, phrase or number into the input box.
  2. Toggle the matching options — capitalization, spaces and punctuation, accents — to set strictness.
  3. Watch the verdict and the symmetry view update live, with matching pairs highlighted.
  4. Check the reversed text and the longest palindrome found inside your input.
  5. Try one of the built-in examples, like “racecar” or “Never odd or even”, to see it in action.

Frequently asked questions

A word, phrase, number or sequence that reads identically in both directions — “level”, “racecar”, 1221, or whole sentences once spaces, case and punctuation are set aside.

Because sentence palindromes are judged on letters and digits only. With the ignore-spaces-and-punctuation and ignore-case options on, the cleaned text “amanaplanacanalpanama” is perfectly symmetrical.

Each character paired with its mirror from the opposite end of the text. Matching pairs are highlighted and mismatches marked, so you can see exactly where a near-palindrome breaks.

Even when your whole text is not a palindrome, the checker scans it for the longest run of characters that forms one and highlights it — useful for word puzzles and analyzing strings.

With the ignore-accents option on, é and e are treated as the same letter, so accented words and phrases can still qualify. Switch it off to require exact character matches.
Share this
Related Tools
GPA Calculator Calculate your weighted grade point average from letter grades and course credits. Add as many courses as you need — instant, free and private. Free
Grade Calculator Work out your current weighted grade from each assignment's score and weight. Add unlimited assignments and see your letter grade update live. Free
Final Grade Calculator Find out exactly what score you need on your final exam to reach the overall grade you want. Enter your current grade, the final's weight and your target. Free
Reading Time Calculator Estimate how long a text takes to read or speak aloud. Enter a word count or paste your text and pick a reading speed for an instant estimate. Free
Word & Character Counter Count words, characters, sentences, paragraphs and reading time as you type — plus live keyword density. Everything runs in your browser, free. Free
Electricity Cost Calculator Find out how much an appliance costs to run. Enter its power in watts or kilowatts, how long it runs and your electricity rate to see daily, monthly and yearly costs. Free
Need help?
Found an issue with this tool? Let our team know.
Report an issue

Add this free tool to your own website — copy and paste the code below.