Palindrome Checker
Does it read the same forwards and backwards? Find out!
✨ Famous Palindromes — click to try!
What Is a Palindrome?
A palindrome is a word, phrase, number, or sequence that reads the same forwards and backwards, ignoring spaces and punctuation. The word comes from the Greek palindromos — "running back again." Palindromes have fascinated humans for millennia: the Latin palindrome SATOR AREPO TENET OPERA ROTAS has been found inscribed on walls from ancient Pompeii to 6th-century Ethiopia.
Our Palindrome Checker strips spaces and punctuation, then compares the cleaned string to its reverse — showing you both the forward and backward forms side by side. Try words, sentences, and even your own name!
Famous Palindromes to Try
Word Palindromes
- RACECAR — most cited English palindrome word
- LEVEL — perfect symmetry
- CIVIC — architectural feel
- KAYAK — water sport connection
- MADAM — classic form of address
- RADAR — from Radio Detection And Ranging
- REFER — verb palindrome
- ROTOR — mechanical palindrome
Sentence Palindromes
- "A man a plan a canal Panama"
- "Was it a car or a cat I saw"
- "Never odd or even"
- "Madam I'm Adam"
- "Do geese see God"
- "Step on no pets"
- "Race fast safe car"
Types of Palindromes
- Character-level palindromes: Each individual character mirrors (RACECAR, LEVEL).
- Word-level palindromes: Each word mirrors when the word sequence is reversed — "Fall leaves as leaves fall."
- Numeric palindromes: Numbers like 121, 1331, and 12321 read the same both ways.
- Biological palindromes: DNA sequences recognised by restriction enzymes are often palindromic — critical in molecular biology.
- Musical palindromes: Compositions that sound the same played forwards and backwards — Bach was a master of this technique.
How the Checker Works
The algorithm is elegantly simple: (1) convert to lowercase, (2) strip all non-alphanumeric characters (spaces, punctuation, apostrophes), (3) compare the result to its reverse. If they match — it's a palindrome! This means "A man, a plan, a canal: Panama!" correctly identifies as palindromic even with commas and an exclamation mark.
Frequently Asked Questions
❓ What is the longest palindrome word in English?
"Detartrated" (12 letters — past tense of "detartrate") is often cited as the longest palindromic word. "Redivider" (9 letters) is the most commonly referenced in mainstream usage.
❓ Are there palindromes in other languages?
Yes — every language has them. Finnish has "saippuakivikauppias" (soapstone vendor, 19 letters), one of the world's longest single-word palindromes.
❓ Is "racecar" really one word or two?
In standard dictionaries it's written as one word: "racecar." Some style guides hyphenate it (race-car) or write two words (race car). Our checker counts it as a palindrome regardless of spacing.