CIPHER TOOLS
Free cryptographic utilities and analysis tools
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Substitution Ciphers
Caesar Cipher
Classic shift cipher - encrypt/decrypt by shifting letters
ROT13 Cipher
Classic spoiler hider - reversible letter rotation
Atbash Cipher
Ancient Hebrew reverse alphabet cipher
Keyed Substitution
Alphabet substitution using keyword-based cipher
Vigenère Cipher
Polyalphabetic cipher using a repeating key
Beaufort Cipher
Reciprocal cipher - encryption equals decryption
Affine Cipher
Multiply-and-shift cipher - encrypt, decrypt and crack from two letters
Transposition Cipher
Rearrange text using columnar transposition methods
XOR Cipher
Encrypt and decrypt with XOR using text, hex or binary keys
Templar (Pigpen) Cipher
Knights Templar / Pigpen symbol cipher encoder and decoder
Cryptanalysis
Frequency Analysis
Analyze letter patterns to break substitution ciphers
Index of Coincidence
Calculate IC to determine cipher type
Kasiski Examination
Find polyalphabetic cipher key length
Substitution Solver
Automated substitution cipher breaking tool
Columnar Analyzer
Test column widths and keys to break columnar transposition
Encoding Tools
Hexadecimal Converter
Convert between text, hex, decimal, and binary
Binary ↔ Text
Convert between binary and text representations
Morse Code
Text to/from Morse code with audio playback
Base64 Tool
Encode and decode data using Base64 encoding
Base64 Chain
Encode or decode text through multiple Base64 layers
UTF-8 Encoder
Convert text to UTF-8 bytes and decode byte sequences
Image Analysis
LSB Decoder
Extract hidden data from image LSB layers
Color Channel
Separate and analyze RGB color channels
LSB Encoder
Hide secret messages in the least significant bits of an image
Image Metadata
View EXIF data and image properties
Text Steganography
Hide messages in plain text with zero-width characters
Mathematical
Logic Tools
Blockchain Lab
Hash Chain Visualizer
Build a chain of blocks and watch tampering break the hashes
Merkle Tree Explorer
Build Merkle trees and generate inclusion proofs
Mining Simulator
Proof-of-work mining at adjustable difficulty
Transaction Simulator
Sign and verify transactions step by step
Smart Contract Puzzle
Find the flaw in a simulated smart contract
Blockchain Steganography
Hidden messages in transaction data
About these tools
Every tool runs entirely in your browser — nothing you type is sent to the server. They are free, need no account, and are built for learning classical cryptography, solving CTF challenges, and cracking the puzzles on this site.
New to ciphers? Start with the Caesar cipher, then use frequency analysis to break it without the key.