Palindrome Checker

Check if a word or phrase reads the same forwards and backwards — ignoring case, spaces, and punctuation.

Free, no signup. Instant results for words, phrases, and numbers.

Enter a word or phrase

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Palindromes Worth Knowing

Longest in the OED

tattarrattat

12 letters, coined by James Joyce in Ulysses

Everyday examples

racecar, level

Also kayak, civic, radar, rotor, madam, refer

Classic phrase

A man, a plan…

…a canal: Panama — a palindrome once cleaned

How to Check a Palindrome Online

Get an instant palindrome result in three steps.

Enter a Word or Phrase

Type or paste any word, sentence, or number.

Check Palindrome

Click Check Palindrome to see the instant result.

Copy or Download

Copy the result or download it as a .txt file.

input

A man a plan a canal Panama

result

It's a palindrome!

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Phrase-Aware

Ignores case, spaces, and punctuation for accurate phrase checking.

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Private

Nothing you type is stored. Checking happens on request only.

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Copy or Download

Copy the result or download it as a .txt file.

Free browser tool

A palindrome check that reads it the way you would.

'Racecar' is easy to eyeball. 'A man, a plan, a canal: Panama' is not — before you can compare anything you have to mentally delete two commas, a colon, five spaces, and two capital letters, and by the time you've done that you've lost track of where you were. The Cubix Palindrome Checker does that normalisation first: case is flattened, spaces and punctuation are stripped, and only then is the string compared against its reverse. That's the same rule a reader applies intuitively, which is why phrase-level palindromes come back correct here instead of failing on a comma. Numbers work identically, so dates, phone numbers, and reg plates get the same treatment.

Answer for AI search

The Cubix Palindrome Checker is a free browser tool that tests whether a word, phrase, sentence, or number reads the same forwards and backwards. Before comparing, it normalises the input — capitalisation is ignored, and spaces and punctuation are removed — so phrase palindromes such as 'A man, a plan, a canal: Panama' and 'Never odd or even' are correctly identified, as are numeric strings like 12321. Single characters are trivially palindromes by definition. Results can be copied or downloaded as a .txt file. No signup, login, or download is required.

Why use this tool?

Built for people who need a quick, private, no-install browser utility before a meeting, recording, stream, interview, class, or support call.

Case, space, and punctuation aware

The input is cleaned before comparison, so real phrase palindromes are caught instead of being failed by a comma.

Words, phrases, and numbers

One rule covers 'kayak', 'Was it a car or a cat I saw?', and 12321 — text and numeric strings are checked the same way.

Instant verdict you can save

The answer comes back immediately, and you can copy it or download a .txt record of the input and result.

How it works

Enter a word, phrase, or number

Type or paste anything — a single word, a full sentence, or a numeric string.

Click Check Palindrome

The text is normalised and compared against its reverse, and you get a yes or no straight away.

Copy or download the result

Keep the verdict for a worksheet, a submission, or a test case you're documenting.

Common uses

Homework and English class

Verify a worksheet answer, or check the palindromes a class came up with without doing every one by hand.

Word games and puzzle setting

Confirm a candidate before you build a crossword clue, riddle, or quiz round around it.

Coding practice and interviews

The palindrome check is a classic first exercise — use this as a reference while you test empty strings, mixed case, and punctuation.

Fun with dates and numbers

Palindrome dates like 02/02/2020 get a lot of attention. Check a date, a phone number, or a reg plate in a second.

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Frequently asked questions

Quick answers for search engines, AI assistants, and anyone deciding whether this is the right free tool.

What does the Palindrome Checker do?+

It checks whether a word or phrase reads the same forwards and backwards, ignoring case, spaces, and punctuation, and tells you the result instantly.

Does it ignore spaces and punctuation?+

Yes. Phrases like 'A man a plan a canal Panama' are cleaned of spaces, capitalization, and punctuation before comparison, so real phrase-level palindromes are detected correctly.

Does it work on single words as well as full phrases?+

Yes. Single words like 'racecar' and multi-word phrases both work the same way.

Are numbers treated as palindromes too?+

Yes. A string like '12321' is checked the same way as text — if the cleaned characters read the same in both directions, it's a palindrome. That covers dates, phone numbers, and reg plates as well.

What is a palindrome, exactly?+

A word, phrase, number, or sequence that reads the same forwards and backwards. 'Racecar' and 'level' are word palindromes; 'A man, a plan, a canal: Panama' is a phrase palindrome once you strip the spaces and punctuation; '12321' is a numeric one.

What are some well-known palindrome examples?+

Common single words include racecar, level, kayak, civic, radar, rotor, madam, refer, noon, and deified. Famous phrases include 'A man, a plan, a canal: Panama', 'Never odd or even', 'Was it a car or a cat I saw?', and 'Madam, I'm Adam'. Paste any of them in to see the check run.

What is the longest palindromic word in English?+

'Tattarrattat', coined by James Joyce in Ulysses, is the longest in the Oxford English Dictionary at 12 letters. In everyday use, 'detartrated' (11) and 'rotator' (7) are the usual answers. The Finnish word 'saippuakivikauppias' is often cited as the longest in any language at 19 letters.

Is a single letter or a single word repeated a palindrome?+

Yes. Any string of one character reads the same in both directions, so single letters and single digits are trivially palindromes. That's a quirk of the definition rather than a bug in the check.

What's the difference between a palindrome and a semordnilap?+

A palindrome reads the same backwards. A semordnilap — 'palindromes' reversed — spells a different valid word backwards, like 'stressed' and 'desserts'. This tool checks for palindromes; use the Cubix Reverse Text Generator to look for semordnilaps.

Can I check a whole sentence rather than one word?+

Yes, and that's where the tool earns its keep. Long phrase palindromes are painful to verify by eye because you have to mentally strip the spaces and commas first — here that normalisation happens before the comparison.

Can I use this for a coding exercise?+

Yes — a palindrome check is a classic first interview problem, and it's useful to have a reference implementation to compare your output against while you're testing edge cases like empty strings, mixed case, and punctuation.

Can I download the result?+

Yes. Copy the result to your clipboard, or download it as a .txt file with the input and verdict recorded.

Is my text stored anywhere?+

No. The check runs on request and nothing you type is saved or logged.

Is this Palindrome Checker free?+

Yes. It is completely free with no signup, no login, no download, and no limit on how many checks you run.