Palindrome Checker
Type any word, sentence, or number and get an instant yes/no answer, along with the exact string that was compared.
Options
The verdict appears here as you type. Try one of the examples above.
Everything runs in your browser — your text is never uploaded.
How it works
- Type or paste your word, sentence, or number into the box — or tap one of the famous examples to load it.
- Read the live verdict. The tool shows the cleaned-up string it compared and that string reversed, so you can see exactly why the answer is yes or no.
- Open Options if you want a stricter test: turn off ignoring case, spaces, or punctuation to compare the text character for character.
Frequently asked questions
- How does the palindrome checker decide yes or no?
- It builds a comparison string from your input — by default lowercasing everything and stripping spaces and punctuation — then reverses that string and checks whether the two are identical. Both the cleaned string and its reversal are displayed, so the verdict is fully transparent rather than a black box.
- Do spaces, capital letters, and punctuation count?
- By default they are ignored, which is the convention for sentence palindromes like “A man, a plan, a canal: Panama.” Each rule is a separate toggle in Options, so you can require exact case, keep spaces significant, or count punctuation if you need a strict character-for-character test.
- Does it work for numbers and dates?
- Yes. Digits are treated like any other character, so you can test numbers such as 12321 or date strings like 02/02/2020 — with the punctuation toggle deciding whether the slashes count. Numeric palindromes are a common recreational-math topic, and the tool handles them the same way it handles words.
- Is my text uploaded anywhere?
- No. The check is a few string operations that run entirely in your browser with JavaScript — nothing is sent to a server, logged, or stored. The page even keeps working offline once it has loaded, so you can paste private text without concern.
- Does it handle accented letters and other alphabets?
- Yes. Cleaning uses Unicode-aware matching, so letters and digits from any script are kept while punctuation is stripped, and accented characters like é or ü are compared as themselves. Note that é and e are treated as different letters — the tool does not strip accents, which matches how palindromes are usually judged in languages that use them.
About this tool
A palindrome is a word, sentence, or number that reads the same forwards and backwards — racecar, level, 12321, or the classic “A man, a plan, a canal: Panama.” This checker gives you a live yes/no verdict as you type, and unlike a simple pass/fail tool it shows its work: you see the cleaned-up string it actually compared and that string reversed, side by side, so a surprising answer is never a mystery.
Everything happens locally in your browser. On every keystroke the tool normalizes your input — lowercasing letters, removing whitespace, and stripping punctuation, each rule controlled by its own toggle in Options — then reverses the result and tests for equality. The cleaning step is Unicode-aware, so accented letters, Cyrillic, Greek, and other scripts are handled correctly, and digits pass through untouched so numeric palindromes work too. Because it is plain string manipulation with no network requests, nothing you type ever leaves your device.
Typical uses go beyond settling a quick argument about whether a phrase counts. Teachers use palindrome checkers for word-play exercises and to introduce string reversal in beginner programming lessons; puzzle writers verify candidate phrases before publishing them; and developers use the visible comparison string as a reference when writing their own palindrome functions, since the default rules here match the standard interview-question definition of ignoring case, spaces, and punctuation.
A few practical tips: try the example chips first to see how sentence palindromes survive the cleaning step. If you are testing code output or an exact sequence, open Options and switch off all three toggles to get a strict character-for-character comparison. For dates, remember the punctuation toggle decides whether separators like slashes count — 02/02/2020 is a palindrome either way, but many dates only work once the separators are stripped.