Palindrome Checker
Type or paste any word, phrase or number to instantly find out if it reads the same forwards and backwards. The checker ignores spaces, punctuation and capitalisation by default. Runs entirely in your browser — private and instant.
Famous Palindromes
| Palindrome | Type |
|---|---|
| racecar | Word |
| level | Word |
| madam | Word |
| civic | Word |
| A man a plan a canal Panama | Phrase |
| Was it a car or a cat I saw | Phrase |
| Never odd or even | Phrase |
| 12321 | Number |
| 1001 | Number |
How Palindrome Detection Works
The algorithm normalises the input — lowercasing it and stripping non-alphanumeric characters — then compares it to its own reverse. If they match, it's a palindrome. This is a classic programming interview problem and a great introduction to string manipulation.
Types of Palindromes
- Word palindromes — single words like "radar", "level" or "civic".
- Phrase palindromes — sentences that ignore spaces and punctuation, like "A man, a plan, a canal: Panama!"
- Number palindromes — integers that read the same both ways, e.g. 121, 1221.
- Date palindromes — dates like 02/02/2020 that read the same forwards and backwards.
Frequently Asked Questions
What is a palindrome?
A palindrome reads the same forwards and backwards. Famous examples: "racecar", "level", and "A man a plan a canal Panama".
Does the checker ignore spaces and punctuation?
Yes. By default it strips spaces, punctuation and ignores case, so "A man, a plan, a canal: Panama!" is correctly identified as a palindrome.
Are there palindrome numbers?
Yes. Numbers like 121, 1331 and 12321 are palindromes. This tool checks any string including numbers.
What is the longest palindrome word in English?
"Detartrated" (11 letters) is one of the longest real English palindromes. "Tattarrattat" (12 letters) was coined by James Joyce.