Paste the mystery text. We'll tell you what it most likely is, why, and decode it where we can.
The identifier works through the same checklist an experienced puzzler would, quickly, and shows its reasoning so you can judge each verdict yourself.
The characters narrow things down fast. Dots and dashes are Morse. Only 0s and 1s is binary. A and B in groups of five is Bacon's cipher. Hex digits are probably hex-encoded text, numbers from 1 to 26 are letter positions, and mixed-case letters and digits in blocks of four point to Base64. Wherever a decode is possible, we run it and show you the result.
For letters, the key number is the index of coincidence: the chance that two letters picked at random are the same. English and any single-alphabet cipher score about 0.066. Ciphers that use several alphabets, like Vigenère, push it down toward 0.038. That one number separates the two big families.
Then it tries the likely candidates: all 25 Caesar shifts, Atbash, every rail fence up to 12 rails, and an automatic Vigenère key search. It scores each result against English. A clean read is strong evidence, so you get the cipher and the answer together.
It looks at the characters first. Only dots and dashes means Morse, only 0s and 1s means binary, numbers from 1 to 26 suggest a letter-number cipher. If the text is letters, it measures how uneven the letter frequencies are (the index of coincidence) and then tries the likely ciphers to see which one turns the text into English.
No tool can. Short messages carry very little evidence, and hand-made puzzle ciphers often break the rules on purpose. Treat the result as a ranked list of leads. The reason shown with each guess tells you what to check.
No. The analysis runs entirely in your browser. Nothing you paste is uploaded or stored.
The chance that two letters picked at random from the text are the same letter. English scores about 0.066 and random letters about 0.038. A simple substitution keeps the English value; a Vigenère cipher pulls it down toward random.