Format a list using regular expressions
|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
|URL-encoded string decoder|
This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 characters
|GET request string parser|
This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences if needed
|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.
This online calculator parses emails from block of text using regular expression
|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.
|RAID arrays сalculator|
This calculators shows the possible variants of RAID arrays, based on the number of drives available.
|RGB - HSV and HSV - RGB converter|
This calculator converts RGB color to HSV color and vice versa
This calculator generates palette of colors from starting color to ending color, using maximum diversity, "rainbow" style.
|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.
|HTML table to JSON array|
Th calculator converts the html table code to JSON array with optional data transpose and compression. It also visualizes numeric data on chart.
This online calculator can join two csv lists by key column the same way JOIN works in SQL (inner join, left outer join, right outer join)
|Relative luminance and contrast ratio|
Two calculators evaluate the relative luminance and contrast ratio for given colors.
|Numbered list maker|
This online calculator numbers lines of text
This online calculator reverses lines of text
This online calculator computes text "fitness". That is, how similar the given text to other texts written in English language.
|Random Letters Generator|
This online generator just generates specified number of symbols, randomly selecting them from given set of symbols
|CSV table to JSON array|
This online calculator converts CSV table to JSON array of objects, using given map of CSV columns to object properties.
|Text fitness (version 2)|
This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses frequencies of unigrams, bigrams and trigrams to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.