Free tools for computer science, math, and dev work
Fast, clear, no clutter — built to explain, not just spit out a number.
Popular tools
Number base converter
1010 → 10
Two’s complement calculator
Shows the steps, not just the result.
IEEE 754 converter
Bit-level breakdown of sign, exponent, and mantissa.
DMS converter
Degrees, minutes, seconds, and back again.
JSON formatter
Format and validate in one step.
Base64 encoder/decoder
Encode or decode text, safely handles unicode.
Bitwise calculator
AND, OR, XOR, and shifts, with the bits shown.
ASCII converter
Text, decimal, and hex, all at once.
Percentage calculator
Percent of a number, percent change, and the reverse of both.
Scientific notation converter
Standard form and scientific notation, both directions.
URL encoder/decoder
Percent-encode or decode a URL or query string.
UUID generator
Generate a random UUID, one click, no signup.
Binary calculator
Add, subtract, multiply, and divide in binary.
Decimal to BCD converter
Each digit encoded separately, the way BCD actually works.
Fraction to decimal converter
Fractions and decimals, both directions, with repeating decimals shown correctly.
Degrees to radians converter
Degrees and radians, both directions, in terms of pi.
Unix timestamp converter
Timestamp to date, date to timestamp, both directions.
Color converter
HEX, RGB, and HSL, all at once, with a live preview.