Free Tools
Free online tools
A directory of free tools from our wider network — calculators, developer utilities, text and time helpers, and more. Every one is free to use with no signup, just like Color Code Kit.
Developer tools
Base64 Decode ↗
Encode and decode Base64 strings.
base64decode.tools
URL Encode / Decode ↗
Percent-encode and decode URLs.
urlencodedecode.com
UUID Generator ↗
Generate UUIDs in every version.
www.uuidcore.com
JSON Tools ↗
Format, validate and convert JSON.
jsontools.tools
Hash Generator ↗
MD5, SHA, BLAKE, HMAC and more.
hashgenerator.tools
Crontab Cheat Sheet ↗
Build and read cron expressions.
crontabsheet.com
Regex Guide ↗
Learn and test regular expressions.
regexguide.com
CIDR Calculator ↗
Subnet and CIDR range calculator.
cidrcalculator.net
Subnet Mask Calculator ↗
Work out subnet masks and ranges.
subnetmaskcalc.net
Epoch Time Converter ↗
Unix timestamp to date and back.
epochtime.tools
Text tools
Calculators
Square Footage Calculator ↗
Calculate area in square feet.
thesquarefootagecalculator.com
Percentage Calculator ↗
Work out percentages quickly.
bestpercentagecalculator.net
Age Calculator ↗
Calculate age from a birth date.
theagecalculator.net
Dimensional Weight ↗
Calculate shipping dim weight.
dimweightcalc.com
Box Volume Calculator ↗
Calculate the volume of a box.
boxvolumecalculator.com
Girth Calculator ↗
Calculate package girth.
girthcalculator.com
Margin vs Markup ↗
Compare margin and markup.
marginvsmarkup.com
EMI Calculator ↗
Calculate loan EMIs.
indiaemi.com
Solar Calculator ↗
Estimate solar system sizing.
prosolarcalc.tools
Time & date tools
File & image tools
About these tools
These are free online tools from our wider network. Like Color Code Kit, they are built to be fast, free and free of signups — each one focused on doing a single job well. They open in a new tab so you don't lose your place here.