Text Encryption & Decryption
Encrypt and decrypt text with Caesar cipher, ROT13, Atbash, and Vigenère cipher. Learn classic cryptography online.
Caesar Cipher
Shifts each letter by a fixed number of positions in the alphabet.
Used by Julius Caesar to communicate with his generals. One of the oldest known encryption techniques.
Text Encryption & Decryption कसरी प्रयोग गर्ने
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Select Encrypt or Decrypt mode.
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Choose your cipher: Caesar, ROT13, Atbash, or Vigenère.
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For Caesar cipher, set the shift value (1–25) using the slider.
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For Vigenère cipher, enter your keyword (letters only).
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Type your text and see the result appear instantly. Use the Copy button to copy the output.
Text Encryption & Decryption बारेमा
The Text Encryption & Decryption tool lets you encode and decode text using four classic cipher techniques: Caesar cipher, ROT13, Atbash, and Vigenère cipher. All processing happens in your browser — your text is never sent to any server.
Caesar Cipher
One of the oldest and simplest encryption methods, used by Julius Caesar. Each letter is shifted by a fixed number of positions in the alphabet (1–25). A shift of 13 is the special case known as ROT13.
ROT13
ROT13 ("rotate by 13 places") is a Caesar cipher with a fixed shift of 13. Applying ROT13 twice returns the original text, making it its own inverse. Historically used to hide spoilers and off-topic content in online forums.
Atbash Cipher
An ancient Hebrew cipher where A↔Z, B↔Y, C↔X, etc. — the alphabet is reversed. Like ROT13, applying it twice returns the original.
Vigenère Cipher
A polyalphabetic cipher using a keyword. Each letter of the plaintext is shifted by the corresponding letter of the keyword, making it much harder to crack than simple Caesar ciphers. Considered unbreakable for centuries.