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• Extract domain names from URLs and count unique names

  This calculator extracts domain names from URLs and counts unique names

• Gravity Falls Bill's symbol substitution cipher decoder

  This online calculator can decode messages written with Bill's symbol substitution cipher

• 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

• Pangram checker

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

• PATHFINDER cipher checker

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

• 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..

• Standard Galactic Alphabet decoder

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

• 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.

• Playfair cipher

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

• Wordpress plugin

  With Planetcalc plugin for Wordpress you can easily insert any planetcalc calculator in your wordpress-based site or blog pages.

• A1Z26 cipher

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

• Atbash cipher

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

• Hill cipher

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

• Morse Code

  Morse Code translator

• 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