Classical Cipher Tools

Beginner Ciphers

Caesar Cipher

Atbash Cipher

Pigpen Cipher

Polybius Square

Historical Ciphers

Vigenère Cipher

Playfair Cipher

Beaufort Cipher

Trithemius Cipher

Alberti Disk Cipher

Porta Cipher

Military-Grade Ciphers

Four-Square Cipher

Running Key Cipher

Vernam Cipher

Autokey Cipher

Straddling Checkerboard

Visual & Symbol Ciphers

Baconian Cipher

Homophonic Cipher

Gronsfeld Cipher

Mathematical Ciphers

Affine Cipher

Hill Cipher

Quagmire Cipher

Calculators

Financial and mathematical calculators for everyday use.

Investment Calculator

Aspect Ratio Calculator

Plant Spacing Calculator

Feet and Inches Calculator

Playback Speed Calculator

Audiobook Speed Calculator

Rule of 72 Calculator