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• Substitution Cipher Tool

  The tool to encrypt/decrypt messages with simple substitution cipher given as key. It is also useful for manual cryptanalysis of substitution cipher - when you have message written in English alphabet partially decrypted with automatic tool and want to tweak the key.

• VARIANT DATE to datetime string

  This online calculator converts VARIANT DATE (double) value to datetime string.

• Base 64 encoding and decoding

  The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

• Email extractor

  This online calculator parses emails from block of text using regular expression

• LL1 grammar analysis. Yet another top-down parser generator.

  The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

• Playfair cipher

  This online calculator encrypts and decrypts a message given Playfair cipher keyword. Non-alphabetic symbols (digits, whitespaces, etc.) are ignored.

• Binary Coded Decimal (BCD)

  This online calculator converts decimal number to binary code in BCD notation and vice versa

• GET request string parser

  This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

• Hill cipher

  This calculator uses Hill cipher to encrypt/decrypt a block of text

• Regular expression tester

  This online calculator allows user to experiment with regular expressions.

• Shannon Entropy

  This online calculator computes Shannon entropy for a given event probability table and for a given message

• Symbol frequencies table

  This online calculator builds symbol frequency table for a given message

• Binary, inverse and complement codes

  Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

• Caesar cipher

  Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

• Conversion between any bases

  This calculator converts number from one numeral system to another, given both system's bases

• Conversion from decimal numeral system

  This calculator converts given decimal value to other positional numeral system

• Conversion of fractional numbers between numeral systems

  This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.

• Count the number of words

  The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.

• Huffman coding

  This online calculator generates Huffman encoding for given frequency of occurrence of symbols.

• Simple math in any numeral system

  This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36