About the Palindrome Checker
A palindrome reads the same forwards and backwards, like racecar, level or the phrase A man, a plan, a canal: Panama. This checker tells you whether your text is one. By default it ignores capital letters, spaces and punctuation, as people do with famous phrases, and you can switch each of these off for a strict check. It also finds the longest palindrome hidden inside your text. Type your word, phrase or number and the palindrome appears at once, with a few related figures underneath, and you can copy the result with one tap. The sums run in your browser, so nothing you enter is uploaded.
Updated October 2026
How to use the Palindrome Checker
- 1Enter your word, phrase or number.
- 2Pick the units or options from the menus if the palindrome tool offers them.
- 3Read the palindrome in the large result box.
- 4Look at the extra rows for related figures.
- 5Press Copy result to keep the answer.
When you need the palindrome
Teachers and puzzle fans use palindromes in word games and programming exercises, since checking one is a classic first coding task. Dates like 12-02-2021 and numbers like 12321 are palindromes too.
The longest palindrome inside is a fun extra: in the word banana it is anana, and in racecar it is the whole word. It uses the centre-expansion method, which is quick even for long texts.
How the palindrome is worked out
The text is cleaned by the options you choose, reversed, and compared with the original. If the two are the same, it is a palindrome. A man, a plan, a canal: Panama becomes amanaplanacanalpanama after cleaning, and that reads the same in both directions, so the answer is yes. The word hello is not a palindrome, but it contains the palindrome ll.
Every answer on this page comes from that one rule, so you can check any result by hand with a calculator. The figures shown underneath, such as other units, are conversions of the same answer.
- Ignore capitals, spaces and punctuation
- Shows the cleaned text and its reverse
- Finds the longest palindrome inside
Mistakes to avoid with palindrome
Strict checking is different from the usual game. With capitals, spaces and punctuation counted, Madam, I'm Adam is not a palindrome, but with them ignored it is. Choose the options that match the rules of your game.
On phone and computer
On a phone, type into the boxes one after another and read the palindrome underneath; Copy result puts it on the clipboard for a message or a note. On a computer the inputs sit on the left and the answer on the right, so you can change one figure and watch the palindrome move. The palindrome checker works the same on both. Before you test a phrase, clean it with Remove Punctuation from Text and Case Converter, then use Reverse Text to see the backwards version for yourself. Character Counter shows how long the phrase is.
Features
- Match the rules of your game
- Numbers work too
- Strict mode counts everything
- Clear messages when the palindrome inputs make no sense
- Copy the result with one tap
- Private: nothing is uploaded
Frequently asked questions
How do I calculate palindrome?
The text is cleaned by the options you choose, reversed, and compared with the original. If the two are the same, it is a palindrome. A man, a plan, a canal: Panama becomes amanaplanacanalpanama after cleaning, and that reads the same in both directions, so the answer is yes. The word hello is not a palindrome, but it contains the palindrome ll.
What is the formula for palindrome?
The text is cleaned by the options you choose, reversed, and compared with the original. If the two are the same, it is a palindrome. The palindrome checker applies it exactly and rounds only the displayed answer to six significant figures.
Is a number a palindrome?
Yes, if its digits read the same both ways, like 12321 or 1001.
Is one letter a palindrome?
Yes, a single character reads the same both ways. An empty box gives no result.
Do spaces and commas matter?
Not in the usual game. You can switch the options on to count them.
Is this palindrome checker free and private?
Yes. It is free, needs no account and runs in your browser, so the numbers you type are not uploaded or stored.