Explore our collection of free online cipher tools for encryption, decryption, and cryptanalysis. Perfect for learning cryptography, solving puzzles, or educational purposes.
Available Tools
Caesar Cipher
Classic Caesar cipher encoder and decoder with support for multiple alphabets and custom shift values.
Caesar Cipher Wheel
Interactive visual Caesar cipher wheel for learning letter substitution and encryption patterns.
Vigenère Cipher Tool
Polyalphabetic substitution cipher using a keyword for stronger encryption than Caesar cipher.
ROT13 Encoder/Decoder
Simple letter substitution cipher that replaces each letter with the letter 13 positions after it.
Atbash Cipher
Ancient Hebrew cipher that reverses the alphabet for encryption and decryption.
Substitution Cipher Tool
Custom substitution cipher tool with support for creating your own letter mappings.
Frequency Analysis Tool
Cryptanalysis tool for analyzing letter frequency to help break substitution ciphers.
About This Category
Online encryption and decryption tools for various classical ciphers. Encrypt and decrypt messages using Caesar cipher, Vigenère cipher, ROT13, Atbash, and other substitution ciphers.