Loading…

How to use Caesar Cipher

Type your text and set a shift amount from 1 to 25, and the tool encrypts it by shifting every letter that many places through the alphabet.

Frequently asked questions

What is the Caesar cipher?

The Caesar cipher is one of the oldest encryption techniques. It shifts each letter by a fixed number of positions in the alphabet. Julius Caesar used a shift of 3.

How do I decrypt Caesar cipher?

Use the negative shift (or 26 minus the shift). For example, to decrypt text encrypted with shift 5, use shift 21 (or shift -5).

Can Caesar cipher be broken?

Yes, easily. There are only 25 possible shifts to try. Caesar cipher is not secure for real encryption but useful for learning cryptography.

More Text Encoding Tools

Text to ASCII Codes
Convert text to ASCII code numbers and decode ASCII codes back to readable text
Text to Unicode Points
Convert text to Unicode code points (U+0048 format) and decode back to characters
Braille Translator
Convert text to Braille Unicode characters and translate Braille back to text
Leetspeak Translator
Convert text to and from leetspeak (l33t) with light and heavy substitution modes
A1Z26 Cipher
Encode letters to numbers (A=1, Z=26) and decode number sequences back to text
Rail Fence Cipher
Encrypt and decrypt text with the zigzag rail fence transposition cipher (2-10 rails)
Bacon Cipher
Encode text into Baconian a/b groups of five and decode Bacon cipher back to text
Affine Cipher
Encrypt and decrypt with the affine cipher using multiplier and shift keys (a coprime to 26)
Polybius Square Cipher
Convert letters to row-column number pairs with the 5×5 Polybius square (I/J shared)
Tap Code Translator
Encode text as prisoner tap-code row,column taps and decode taps back to letters (K→C)
Beaufort Cipher
Encrypt and decrypt with the reciprocal Beaufort cipher using a keyword
Gronsfeld Cipher
Encrypt and decrypt with the Gronsfeld cipher using a numeric digit key

← View all Text Encoding ToolsBrowse all 1,100+ tools →