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• 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.

• Binary Coded Decimal (BCD)

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

• 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

GET request string parser

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

GET request string parser

qtf_keyword:context=ssgid%3a%3a4f254f10-bb2d-4ba4-b536-09b5a7e0280c%7cSPS-Location%3a%3a%7cSPS-Responsibility%3a%2c%3a%7c&hits=10&rpf_navigation:hits=50&rpf_navigation:enabled=True&spell=suggest&qtf_parsekw:timezone=51&type=kwall&qtf_teaser:dynlength=185 GET request string

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PLANETCALC, GET request string parser

• 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.

• Email extractor

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

• Hill cipher

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

• Huffman coding

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

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.

LL1 parser generator

expr=term, expr1; expr1="+",term,expr1|"-",term,expr1|; term=factor, term1; term1="*", factor, term1 | "/", factor, term1|; factor="(", expr , ")" | number; number=digit , {digit}; digit = "1"|"2"|"3"|"4"|"5"|"6"|"7"|"8"|"9"|"0"; syntax=expr; EBNF grammar

Extended BNF grammar in ISO/IEC 14977 : 1996(E) form.

(1+2)/3*(4+5) Expression

Remove rules

Rule names divided by comma, which must be removed.

Show FIRST/FOLLOW sets

Show parsing tree.

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PLANETCALC, LL1 parser generator

• Playfair cipher

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

• 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

• 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

• Symbol frequencies table

  This online calculator builds symbol frequency table for a given message

• VARIANT DATE to datetime string

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

• Vigenère cipher

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