Tool directory
Every utility follows the same layout: large inputs, monospace outputs, and instant updates. Filter by category or start from the homepage search.
Filter:AllClassical CiphersEncoding & DecodingCommunication CodesPuzzle ToolsSecurity & HashingSteganographyNumber Theory
Morse Code Translator
Communication CodesConvert text to Morse code and decode dots and dashes back to readable letters.
Binary to Text Converter
Encoding & DecodingTurn plain text into 8-bit binary bytes and convert binary strings back to text.
Base64 Encode / Decode
Encoding & DecodingEncode text to Base64 or decode Base64 payloads with UTF-8-safe handling.
Caesar Cipher
Classical CiphersEncrypt or decrypt messages by shifting letters through the alphabet.
Vigenère Cipher
Classical CiphersPolyalphabetic substitution cipher using a keyword for enhanced encryption.
ROT13 Cipher
Classical CiphersSimple letter substitution cipher that rotates letters by 13 positions.
Atbash Cipher
Classical CiphersReverses the alphabet mapping A to Z, B to Y, and so on for encoding.
Pigpen Cipher
Classical CiphersGrid-based substitution cipher using geometric symbols to represent letters.
Playfair Cipher
Classical CiphersDigraph substitution cipher that encrypts pairs of letters using a 5x5 grid.
Four-Square Cipher
Classical CiphersDual-key digraph cipher using four 5x5 grids for enhanced substitution security.
Hill Cipher
Classical CiphersMatrix-based polygraphic cipher using linear algebra for block encryption.
ADFGVX Cipher
Classical CiphersWWI German field cipher combining fractionation and transposition for military security.
Affine Cipher
Classical CiphersMathematical cipher using linear functions ax + b for letter substitution.
Polybius Square
Classical CiphersAncient Greek coordinate system converting letters to numerical positions for signaling.
Porta Cipher
Classical CiphersRenaissance polyalphabetic cipher using 13 reciprocal substitution pairs.
Gronsfeld Cipher
Classical CiphersNumeric key variant of Vigenère cipher popular in CTF competitions.
Scytale Cipher
Classical CiphersAncient Spartan transposition cipher using cylindrical rod geometry.
Double Transposition
Classical CiphersAdvanced cipher applying columnar transposition twice with dual keywords for enhanced security.
Base85 Encode/Decode
Encoding & DecodingRFC 1924 efficient binary-to-text encoding using 85 printable ASCII characters.
Ascii85 Encode/Decode
Encoding & DecodingAdobe variant of Base85 with delimiters for PDF and PostScript applications.
Base62 Encode/Decode
Encoding & DecodingURL-safe encoding using alphanumeric characters for web applications and APIs.
Hex Encoder/Decoder
Encoding & DecodingConvert text to hexadecimal format and decode hex strings back to readable text.
URL Encoder/Decoder
Encoding & DecodingEncode URLs for safe web use and decode URL-encoded strings back to original format.
HTML Entity Encoder/Decoder
Encoding & DecodingConvert characters to HTML entities for safe display and decode entities back to text.
QR Code Generator
Encoding & DecodingCreate QR codes from text, URLs, or any data for easy mobile scanning.
JWT Decoder
Security & HashingDecode and view JSON Web Tokens to inspect headers, payload, and signature.
Semaphore Flags
Communication CodesNaval flag signaling system using hand-held flags for visual communication.
Maritime Signal Flags
Communication CodesInternational maritime communication system using colored flags for messages.
ASL Fingerspelling
Communication CodesAmerican Sign Language alphabet using hand shapes for letter communication.
International Maritime Signal Flags
Communication CodesComplete ship communication flags system for naval and maritime signaling.
Anagram Solver
Puzzle ToolsFind all possible anagrams and word combinations from given letters.
Word Pattern Solver
Puzzle ToolsHelp with cryptograms using word patterns and letter substitutions.
Letter Frequency Analyzer
Puzzle ToolsCount and analyze letter frequencies in text for cryptogram solving.
Substitution Cipher Helper
Puzzle ToolsTools and utilities for solving substitution cipher puzzles.
MD5 Hash Generator
Security & HashingGenerate MD5 cryptographic hashes for data integrity verification.
SHA-256 Hash Generator
Security & HashingGenerate SHA-256 cryptographic hashes for secure data verification.
Password Strength Checker
Security & HashingEvaluate password strength and get security recommendations.
UUID Generator
Security & HashingGenerate unique UUIDs for identifiers and database keys.
Random String Generator
Security & HashingGenerate secure random strings for passwords and tokens.
Text Steganography
SteganographyHide secret messages in text using invisible whitespace characters.
Image Steganography
SteganographyHide and reveal messages within image files using LSB steganography.
Invisible Text
SteganographyHide text using zero-width characters that are invisible to the eye.
NATO Phonetic Alphabet
Communication CodesSpell words with Alfa, Bravo, Charlie and the full ICAO radiotelephony alphabet.
Braille Translator
Communication CodesMap Latin letters to Unicode braille cells for basic embossed-style output.
Autokey Cipher
Classical CiphersPolysubstitution cipher that uses the plaintext itself as part of the encryption key.
Beaufort Cipher
Classical CiphersVariant of Vigenère cipher using reciprocal mathematical operation for encryption.
Rail Fence Cipher
Classical CiphersSimple transposition cipher that writes text in a zigzag pattern across multiple rails.
Columnar Transposition
Classical CiphersSophisticated transposition cipher using keyword columns to rearrange text.
Baconian Cipher
Classical CiphersHide binary messages using two different fonts or character representations.
Running Key Cipher
Classical CiphersUses long text passages like book content as the encryption key for enhanced security.
Base32 Encode / Decode
Encoding & DecodingEncode text to Base32 or decode Base32 payloads for safer encoding in various systems.
Base58 Encode / Decode
Encoding & DecodingBitcoin and cryptocurrency encoding that avoids ambiguous characters for better readability.
ASCII Art Generator
Encoding & DecodingConvert text and create ASCII art representations in various styles.
Unicode Normalizer
Encoding & DecodingConvert between Unicode normalization forms for consistent text representation.
Punycode Converter
Encoding & DecodingConvert international domain names to ASCII-compatible IDN format for web addresses.
Tap Code
Communication CodesPrison communication system using taps on surfaces to encode letters in a 5x6 grid pattern.
Flag Semaphore with Animation
Communication CodesVisual animated demonstration of hand positions for flag semaphore communication system.
Maritime Signal Flags with Animation
Communication CodesAnimated flag demonstrations for maritime communication and naval signaling.
International Maritime Signal Flags
Communication CodesComplete standardized set of international maritime signal flags for naval communication.
Aviation Phonetic Alphabet
Communication CodesICAO alphabet used in aviation for clear communication of letters and numbers.
Cryptogram Solver
Puzzle ToolsAutomated solving of substitution ciphers using frequency analysis and pattern recognition.
Pattern Recognition
Puzzle ToolsIdentify repeating patterns in encrypted text to help break substitution ciphers.
Index of Coincidence Calculator
Puzzle ToolsStatistical tool for cipher analysis to determine if text is encrypted and likely cipher type.
Kasiski Examination
Puzzle ToolsFind repeated sequences to determine cipher key length for polyalphabetic ciphers.
Friedman Test
Puzzle ToolsStatistical test to determine if text is encrypted and likely cipher type with key length analysis.
SHA-1 Hash Generator
Security & HashingGenerate SHA-1 hashes for data integrity verification and legacy compatibility.
SHA-512 Hash Generator
Security & HashingGenerate SHA-512 hashes for maximum security and data integrity verification.
HMAC Generator
Security & HashingGenerate hash-based message authentication codes for secure message verification.
bcrypt Hash Checker
Security & HashingVerify and analyze bcrypt password hashes for security validation and format checking.
Salt Generator
Security & HashingGenerate cryptographic salts for secure password hashing and random number generation.
Entropy Calculator
Security & HashingMeasure password/string randomness and strength using Shannon entropy analysis.
Character Counter
Puzzle ToolsDetailed text statistics including characters, words, sentences, paragraphs, and reading time estimates.
Reading Level Calculator
Puzzle ToolsFlesch-Kincaid and other readability metrics to analyze text complexity and reading difficulty.
Text Diff Tool
Puzzle ToolsCompare two texts and show differences with detailed analysis of additions, deletions, and modifications.
Palindrome Checker
Puzzle ToolsFind palindromes in text with position analysis and longest palindrome identification.
Word Reverser
Puzzle ToolsReverse text, words, or characters with multiple reversal modes for text manipulation.
Audio Steganography
SteganographyHide messages in audio files using LSB (Least Significant Bit) encoding techniques.
Whitespace Steganography
SteganographyHide messages using different types of spaces (spaces and tabs) for invisible encoding.
Markdown Steganography
SteganographyHide messages in markdown formatting using emphasis markers and text formatting.
CSS Steganography
SteganographyHide messages in CSS comments and properties using invisible encoding techniques.
Roman Numeral Converter
Puzzle ToolsConvert between Roman numerals and Arabic numbers with validation and historical context.
Decimal to Other Bases
Puzzle ToolsConvert decimal numbers to octal, base-32, base-36, and other number systems.
Scientific Notation Converter
Puzzle ToolsConvert between standard and scientific notation with mantissa and exponent analysis.
Barcode Generator
Puzzle ToolsCreate various barcode formats (Code128, EAN, UPC) with validation and format information.
Checksum Calculator
Security & HashingCalculate Luhn, CRC32, MD5, and SHA1 checksums for data validation and integrity checking.
Time/Unix Timestamp Converter
Puzzle ToolsConvert between human-readable dates and Unix timestamps with timezone support.
Color Code Converter
Puzzle ToolsConvert between HEX, RGB, HSL, and CSS color formats with comprehensive color analysis.
Caesar Brute Force
Classical CiphersTry all 25 Caesar cipher shifts at once with automatic ranking by likelihood.
Vigenère Cracker
Classical CiphersAuto-crack Vigenère ciphers using Kasiski examination and frequency analysis.
Book Cipher Tool
Puzzle ToolsEncode and decode messages using position references to any text or book.
Null Cipher Detector
Puzzle ToolsFind hidden messages using nth-letter patterns and other null cipher techniques.
Text to Number (A=1, B=2)
Puzzle ToolsConvert text to numbers using A=1, B=2, phone keypad, and ASCII encoding systems.
SHA-3 / SHAKE Hash Generator
Security & HashingGenerate SHA-3 and SHAKE hashes using the latest Keccak sponge construction algorithms.
PBKDF2 / Argon2 Hash Tool
Security & HashingModern password hashing with PBKDF2 and Argon2 algorithms for secure key derivation.
GCD/LCM Calculator
Number TheoryCalculate greatest common divisor and least common multiple for number theory and mathematical problems.
Modular Arithmetic Calculator
Number TheoryCompute modulo operations, modular inverses, and modular exponentiation for cryptography and mathematics.
Prime Factorization
Number TheoryFind prime factors of any integer with detailed breakdown and mathematical properties.
Extended Euclidean Algorithm
Number TheorySolve Bézout's identity and find modular inverses using the extended Euclidean algorithm.
Chinese Remainder Theorem Solver
Number TheorySolve systems of simultaneous linear congruences using the Chinese Remainder Theorem.
XOR Calculator
Number TheoryPerform bitwise XOR operations on multiple numbers with binary and hexadecimal representations.
OTP / TOTP Generator
Security & HashingGenerate time-based and counter-based one-time passwords for two-factor authentication.
RSA Key Inspector
Security & HashingInspect RSA public and private keys to view parameters, format, and security properties.
Base64 to Hex / Hex to Base64
Encoding & DecodingConvert directly between Base64 and hexadecimal formats with bidirectional conversion.
IP Address Encoder
Encoding & DecodingConvert IP addresses to decimal, hexadecimal, octal, and binary representations.
Zero-Width Character Steganography
SteganographyHide messages in text using invisible zero-width characters that don't occupy visual space.
DNA Steganography
SteganographyEncode text as DNA sequences using ACGT bases for bioinformatics puzzles and creative encoding.
Emoji Steganography
SteganographyHide messages in emoji sequences using variation selectors for covert communication.