Developer Calculators

Base64 Encoder / Decoder

Encode text to Base64 or decode Base64 back to text.

URL Encoder / Decoder

Encode text for safe use in a URL, or decode a URL-encoded string.

Number Base Converter

Convert a number between binary, octal, decimal, and hexadecimal.

Unix Timestamp Converter

Convert between Unix timestamps and human-readable dates.

UUID Generator

Generate a random version 4 UUID.

CSS Unit Converter

Convert between px, rem, and em CSS units.

Aspect Ratio Calculator

Calculate the missing dimension to preserve an aspect ratio.

Text Line & Byte Counter

Count lines, words, and byte size of a block of text or code.

Cron Interval Calculator

Calculate how many times a job running every N minutes fires per day.

HTTP Status Code Lookup

Look up the meaning of any standard HTTP status code.

Roman Numeral Converter

Convert numbers to and from Roman numerals.

Morse Code Translator

Translate text to Morse code, or Morse code back to text.

ASCII Value Calculator

Find the ASCII code of a character, or the character for an ASCII code.

Semantic Version Comparator

Compare two semantic version numbers to see which is newer.

Byte Size Formatter

Convert a raw byte count into a human-readable size (KB, MB, GB).

String Repeat Calculator

Repeat a string a specified number of times.

Levenshtein (Edit) Distance Calculator

Calculate the minimum number of edits needed to change one string into another.

ASCII Checksum Calculator

Calculate a simple checksum by summing the ASCII values of a string's characters.

Password Entropy Calculator

Calculate the entropy (in bits) of a password given its character set and length.

URL Query Parameter Counter

Count the number of query string parameters in a URL.

Hash Collision Probability Calculator

Calculate the probability of a hash collision given a hash space and item count.

API Rate Limit Calculator

Calculate how many requests are allowed over a custom time window, given a rate limit.