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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.

  • Caesar cipher

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

  • 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.

  • Extract domain names from URLs and count unique names

    This calculator extracts domain names from URLs and counts unique names

A1Z26 cipher

A1Z26 is very simple direct substitution cypher, where each alphabet letter is replaced by its number in the alphabet.

PLANETCALC, A1Z26 encoder/decoder

A1Z26 encoder/decoder

  • Hill cipher

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

  • Isogram checker

    This online calculator can check if a word/phrase is an isogram.

  • Lines filter by number

    This online calculator filters lines of text by removing designated lines or, you can say, leaving only designated lines

  • List intersection

    This calculator parses list using regular expression, then counts unique matches and lists them in decreasing order

  • Morse Code

    Morse Code translator

  • Pangram checker

    This online calculator can check if a phrase is a pangram.

Atbash cipher

This calculator allows you to encrypt and decrypt text with Atbash method

PLANETCALC, Atbash cipher

Atbash cipher

  • PATHFINDER cipher checker

    This online calculator decrypts digits encrypted by PATHFINDER type of cipher.

  • Playfair cipher

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

  • Rail fence cipher

    This article contains two calculators, first can be used to encode message with the rail fence cipher, second can be used to crack message encoded with the rail fence cipher by brute force. Decoded simply outputs decoded message for different number of "rails".

  • Repeated Word Heatmap

    This calculator can help avoid unwanted word repetition in prose. It counts the number of occurrences of each word in the document, both globally, and within the "sliding window" distance before and after each word. It highlights the words which are used frequently near each other..

  • Repeated Word Heatmap

    This calculator can help avoid unwanted word repetition in prose. It counts the number of occurrences of each word in the document, both globally, and within the "sliding window" distance before and after each word. It highlights the words which are used frequently near each other..

  • Shannon Entropy

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

  • Standard Galactic Alphabet decoder

    This online calculator can decode message written with standard galactic alphabet symbols

  • Symbol frequencies table

    This online calculator builds symbol frequency table for a given message

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