Tools
151+ tools for geocaching puzzles. Convert coordinates, decode ciphers, analyze text, and solve mystery caches.
Coordinates & Navigation
19 tools
Coordinate Converter
Convert between DD, DDM, DMS, UTM, and other coordinate formats
Coordinate Validator
Validate GPS coordinates and check for common errors
Coordinate Averager
Average multiple GPS readings for more accurate positioning
Centroid Calculator
Find the geographic center of multiple coordinates
Waypoint Projection
Project a new waypoint from a starting point using bearing and distance
Distance Calculator
Calculate the distance between two coordinate points
Bearing Calculator
Calculate the bearing between two coordinate points
Midpoint Calculator
Find the midpoint between two or more coordinates
Grid Reference Converter
Convert UK/Irish National Grid references to coordinates
What3Words Helper
Work with What3Words addresses for precise locations
Plus Codes (Open Location Code)
Convert between Plus Codes and GPS coordinates
Sun Calculator
Calculate sunrise, sunset, and solar noon for any location
Shadow Length Calculator
Calculate shadow lengths from sun position or object heights from shadows
Coordinate Triangulation
Find intersection point of bearings from multiple known locations
MGRS Converter
Convert between Military Grid Reference System and GPS coordinates
Maidenhead Grid Locator
Convert between ham radio Maidenhead grid squares and GPS coordinates
Geohash Converter
Convert between Geohash strings and GPS coordinates
Coordinate Offset Tool
Apply offsets to coordinates, calculate differences, swap/negate components
Coordinate Parser
Parse coordinates from text in various formats automatically
Ciphers & Encoding
81 tools
Caesar Cipher
Encode or decode text using Caesar cipher (ROT-N shift)
ROT13
Quick ROT13 encoder/decoder
Vigenere Cipher
Encode or decode text using the Vigenere cipher with a keyword
Atbash Cipher
Reverse alphabet cipher (A=Z, B=Y, etc.)
Base64
Encode or decode Base64 text
Morse Code
Convert text to Morse code and back
Binary Converter
Convert text to binary and binary to text
Hexadecimal Converter
Convert between text, decimal, and hexadecimal
ASCII Converter
Convert text to ASCII codes and ASCII codes to text
Reverse Cipher
Reverse text by characters, words, or lines
Phone Keypad Decoder
Decode messages encoded with old phone keypad (T9/multi-tap)
Bacon Cipher
Encode and decode Bacon cipher with steganography detection
Polybius Square
Encode and decode using the Polybius square cipher
Tap Code
Encode and decode tap code (prison knock code)
Affine Cipher
Encode and decode using the Affine cipher with keys a and b
Rail Fence Cipher
Encode and decode using the Rail Fence (zigzag) cipher
Braille Converter
Convert text to Braille and Braille to text
Playfair Cipher
Encode and decode using the Playfair cipher with a 5x5 grid
Semaphore Flag
Encode and decode semaphore flag signals
Octal Converter
Convert text to octal (base 8) and back
Columnar Transposition
Encode and decode using columnar transposition cipher
NATO Phonetic Alphabet
Convert text to NATO phonetic alphabet and back
Book Cipher
Decode messages using a book or text as the key
Pigpen Cipher
Encode and decode the Pigpen (Masonic) cipher
Beaufort Cipher
Encode and decode using the reciprocal Beaufort cipher
Keyboard Shift Cipher
Decode text shifted on a QWERTY keyboard layout
Skip / Scytale Cipher
Encode and decode using skip cipher (every nth letter)
Substitution Cipher Solver
Interactive tool for solving substitution ciphers
Autokey Cipher
Encode and decode using the Autokey cipher variant
Unicode Converter
Convert text to Unicode code points in multiple formats
Bifid Cipher
Fractionating cipher using Polybius square
Trifid Cipher
3D fractionating cipher using a 3x3x3 cube
Four Square Cipher
Digraphic cipher using four 5x5 squares
Baudot Code (ITA2)
5-bit telegraph encoding used in teleprinters
Running Key Cipher
Vigenere variant using a text passage as the key
Two Square Cipher
Digraphic cipher using two 5x5 squares
ADFGVX Cipher
WWI German cipher combining substitution and transposition
Gronsfeld Cipher
Vigenere variant using numeric key (0-9)
Straddling Checkerboard
Cold War cipher with variable-length numeric encoding
Porta Cipher
Reciprocal polyalphabetic cipher from the 16th century
Nihilist Cipher
Russian cipher combining Polybius square with keyword addition
Homophonic Cipher
Substitution cipher where letters have multiple number options
Trithemius Cipher
Progressive shift cipher using the tabula recta
Hill Cipher
Polygraphic cipher using matrix multiplication
Route Cipher
Transposition cipher reading grid in various patterns
Null Cipher Extractor
Extract hidden messages from text using null cipher techniques
Pollux Cipher
Encode Morse code using digit substitutions
Fractionated Morse Cipher
Morse code with trigraph substitution for encryption
Dancing Men Cipher
Sherlock Holmes stick figure cipher decoder
Dvorak Keyboard Converter
Convert between QWERTY, Dvorak, and Colemak layouts
Gold Bug Cipher
Edgar Allan Poe symbol substitution cipher
Templar Cipher
Knights Templar geometric symbol cipher
Clock Cipher
Letters encoded as clock face positions
Amsco Cipher
Alternating single/double letter columnar transposition
Chaocipher
Mechanical cipher with dynamic alphabet permutation
Base32 Encoder/Decoder
Base32 encoding in multiple variants (RFC 4648, z-base-32, Crockford)
Elian Script
Modern cipher alphabet based on 3x3 grid pattern
Kenny Code (Omgwtf)
Text encoded using only m, p, and f characters
Wingdings Translator
Convert text to Wingdings symbols and back
ROT47 Cipher
ROT47 - rotates all printable ASCII characters by 47
T9 Predictive Text
T9 number sequences with dictionary word lookup
Navajo Code Talkers
WWII Navajo Code Talkers cipher with animal words
ASCII85 / Base85
Efficient binary-to-text encoding used in PostScript and PDF
Enigma Machine
Simulate the WW2 Enigma cipher machine with rotors, reflector, and plugboard
Scytale Cipher
Ancient Greek transposition cipher using a wrapped cylinder
Cardan Grille
Mask-based cipher with clickable grid for extracting hidden messages
Solitaire Cipher
Card-based cipher from Cryptonomicon by Bruce Schneier
Maritime Signal Flags
International maritime signal flag alphabet with visual flags
DTMF Tone Decoder
Encode and decode DTMF telephone tones and frequency pairs
Musical Notes Cipher
Encode and decode messages using musical notes (C D E F G A B)
QR Code Generator
Generate QR code patterns and learn about QR code structure
Barcode Analyzer
Analyze barcode numbers, validate check digits (EAN-13, UPC, Code 39)
Zodiac-Style Cipher
Decode homophonic substitution ciphers with symbol frequency analysis
Hebrew Alphabet Ciphers
Encode and decode using Albam, Atbah, Avgad, and Aiq Bekar ciphers
Spelling Alphabets
Convert text using NATO, LAPD, German, Dutch, Swedish, Italian, Spanish phonetic alphabets
Tap Code / Knock Cipher
Encode and decode tap code (prison knock code) using a 5x5 grid
NATO Phonetic Decoder
Convert text to NATO phonetic alphabet and decode back
Pig Latin Converter
Convert text to and from Pig Latin
Morse Code Audio
Generate Morse code audio from text with adjustable speed and frequency
NATO Phonetic Alphabet
Convert to NATO phonetic alphabet with quiz mode for practice
Fictional Alphabets
Decode alphabets from games and movies: Minecraft, Skyrim, Star Wars, and more
Text Analysis
16 tools
A1Z26 (A=1, B=2)
Convert letters to numbers and vice versa
Letter Frequency
Analyze the frequency of letters in text
Character Counter
Count characters, words, and lines in text
Text Reverser
Reverse text, words, or lines
Case Converter
Convert text to uppercase, lowercase, title case, etc.
Word Pattern Analyzer
Analyze word patterns for solving cryptograms
Anagram Solver
Find words from rearranged letters
Word Value Calculator
Calculate numeric values of words using A=1, B=2, Z=26
Palindrome Checker
Check text and numbers for palindromes, find and create them
Steganography Detector
Detect hidden messages in text using various steganographic techniques
Flag Identifier
Identify country flags by colors, features, or search
Word Search Solver
Find words in a grid and reveal hidden messages from unused letters
Crossword Pattern Solver
Find words matching crossword patterns with wildcards
Text Reverser
Reverse text by characters, words, lines, or sentences
Letter Boxed Solver
Solve Letter Boxed puzzles where consecutive letters must be from different sides
Word Length Analyzer
Analyze word lengths and extract letters at specific positions
Math & Numbers
35 tools
Roman Numerals
Convert between Roman numerals and decimal numbers
Prime Number Tools
Check if a number is prime, factorize, or generate primes
Number Base Converter
Convert numbers between any bases (2-36)
Digital Root
Calculate the digital root (recursive digit sum) of a number
Modulo Calculator
Calculate the remainder of division (modulus operation)
GCD & LCM Calculator
Calculate Greatest Common Divisor and Least Common Multiple
Fibonacci Checker
Check if a number is in the Fibonacci sequence
Resistor Color Code
Decode resistor color bands or find colors for a resistance value
Periodic Table Decoder
Convert element symbols to atomic numbers and vice versa
ISBN Checker
Validate ISBN-10 and ISBN-13 book numbers
Mayan Numbers
Convert between decimal and Mayan vigesimal numbers
Date Calculator
Day of year, week number, days between dates
Prime Factorization
Find prime factors, divisors, and divisor sums
Hebrew Numerals & Gematria
Convert Hebrew numerals and calculate gematria values
Greek Numerals & Isopsephy
Convert Greek numerals and calculate isopsephy values
Shadoks Numbers
Base-4 counting system (GA, BU, ZO, MEU)
Cistercian Numerals
Medieval single-glyph notation representing 1-9999
Triangle Calculator
Solve triangles given sides and angles, calculate area and properties
Lunar Phase Calculator
Calculate moon phases, illumination, and upcoming lunar events
Checksum Calculator
Calculate Luhn, Verhoeff, Damm, and modular checksums
Number Sequence Solver
Identify patterns in number sequences and predict next terms
Egyptian Fractions
Convert fractions to sums of unit fractions (1/n)
Color Code Converter
Convert colors between HEX, RGB, HSL, CMYK and decimal formats
Continued Fractions
Convert decimals to continued fractions and find rational approximations
Unit Converter
Convert between units of length, area, volume, weight, temperature, speed, time, and angle
Magic Square Generator
Generate and verify magic squares of various sizes
Happy Numbers
Check for happy, perfect, abundant, deficient, and amicable numbers
Binary Clock Decoder
Decode and encode time in BCD binary clock format
Element Symbol Decoder
Convert between element symbols and atomic numbers, spell words with elements
Text to Numbers
Convert between numbers and words, calculate letter value sums
Number Word Finder
Find and extract number words from text (one, two, first, second...)
Number Base Converter
Convert numbers between any bases (2-36)
Digit Sum Calculator
Calculate digit sums, digital roots, alternating sums, and more
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, Rankine, and Réaumur
Chemical Formula Parser
Parse chemical formulas for molecular mass and atomic number sums