Palindrome Checker
Type any text to check if it's a palindrome — ignoring spaces, punctuation and case.
Reviewed by the ToolNestr Editorial Team — July 2026
How palindrome checking works
The palindrome checker removes all non-alphanumeric characters (spaces, punctuation, symbols) from the input, converts everything to lowercase, then compares the cleaned string against its reverse. If both strings are identical, the input is a palindrome. This approach ensures that spacing, capitalisation, and punctuation do not affect the result.
The tool also shows the intermediate steps — the cleaned version and the reversed version — so you can see exactly why the text passed or failed. A visual character-by-character comparison highlights matching positions in green and mismatches in red, making it easy to spot where a palindrome breaks.
Worked example
Palindrome types
Distribution of palindrome types found in common usage.
Puzzle Enthusiast
Explores palindromic words and phrases as a word puzzle hobby. Discovers new palindromes and shares them with fellow enthusiasts.
Teacher
Uses palindromes as a fun classroom activity to teach pattern recognition, reversing, and word structure to students.
Student
Learns about palindromes in language arts or mathematics classes. Uses the checker to verify homework examples.
Word Game Player
Plays word games like Scrabble and Wordle. Uses palindrome awareness to spot reversible word patterns during gameplay.
| Palindrome | Type | Length |
|---|---|---|
| racecar | Single word | 7 letters |
| madam | Single word | 5 letters |
| level | Single word | 5 letters |
| radar | Single word | 5 letters |
| A man, a plan, a canal: Panama | Phrase | 21 letters |
| Never odd or even | Phrase | 13 letters |
| Was it a car or a cat I saw? | Sentence | 14 letters |
| 12321 | Number | 5 digits |
How to use the palindrome checker
Type your text
Enter any word, phrase, number or sentence into the text area above.
See the verdict
Instantly see if it is a palindrome, along with length stats and character analysis.
Explore the details
View the cleaned and reversed versions to understand why the check passed or failed.
Tips for finding palindromes
Start with short words
Three-letter words like "dad", "mom", "pop" and "bib" are the easiest palindromes. Build up to longer words and phrases.
Use symmetrical structure
When writing your own palindromes, start from the outside and work inward. The first and last letters must match, then the second and second-to-last, and so on.
Numbers are easier than words
Numeric palindromes are simpler because there are no vowels, silent letters or spelling rules to worry about. Try dates and times like 12:21 or 01/10/10.
What is a palindrome?
A palindrome is a word, phrase, number or sequence of characters that reads the same forwards and backwards when ignoring spaces, punctuation and capitalisation. The term comes from the Greek words "palin" (again) and "dromos" (direction). Palindromes have fascinated word lovers for centuries and are a popular form of constrained writing.
History
The earliest known palindrome is the Latin "Sator Square" found in Pompeii ruins dating to 79 AD. It reads: "SATOR AREPO TENET OPERA ROTAS". In English, palindromes gained popularity in the 19th and 20th centuries. Writers like James Joyce incorporated palindromes into their work, and recreational linguists continue to discover and create new ones.
Famous examples
The most famous English palindrome is "A man, a plan, a canal — Panama" attributed to Leigh Mercer. Other well-known examples include "racecar", "madam", "level", "radar", "Never odd or even", and "Was it a car or a cat I saw?". There are also palindrome dates like 02/02/2020 and palindrome times like 12:21.
Palindrome variants
Beyond standard palindromes, there are interesting variants: semordnilaps (words that spell another word backwards like "stressed/desserts"), phonetic palindromes (sound the same backwards), palindromic numbers, palindromic dates, and even palindromic sentences in multiple languages. Palindromes also exist in music and DNA sequences, where certain genetic patterns read the same in both directions.
Frequently asked questions
What is a palindrome?
A palindrome is a word, phrase, number or sequence that reads the same forwards and backwards, ignoring spaces, punctuation and capitalisation.
Is "racecar" a palindrome?
Yes, "racecar" reads the same forwards and backwards — it is the most common example of a palindrome word.
Does the checker ignore punctuation and spaces?
Yes. When checking, all spaces, punctuation marks and capitalisation are removed so only the letters and numbers are compared.
What is the longest English palindrome?
"A man, a plan, a canal — Panama" is one of the most famous long palindromes. There are even longer ones like "A man, a plan, a cat, a ham, a yak, a yam, a hat, a canal — Panama".
Are numbers palindromes too?
Yes. 121, 12321, 1001 are numeric palindromes. The date 02/02/2020 is also a palindrome in some date formats.
What is a semordnilap?
A semordnilap (palindromes spelled backwards) is a word that spells a different word when reversed, like "stressed" and "desserts".
Can a single letter be a palindrome?
Yes, any single character is technically a palindrome since it reads the same forwards and backwards.
What is the longest palindrome word in English?
"Tattarrattat" (a type of door knock) at 12 letters is the longest palindrome in the Oxford English Dictionary.
Does case matter?
No, the checker ignores capitalisation. "Racecar" and "racecar" both return true for palindrome check.
What makes a palindrome valid in this checker?
After removing all non-alphanumeric characters and converting to lowercase, if the string equals its reverse, it is a palindrome.