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
Barcode & QR Generator ↗
Generate QR codes and barcodes.
barcodeandqr.com
Internet Speed Test ↗
Test download, upload and ping speed.
checkinternetspeed.tools
What Is My IP ↗
See your public IP and location.
checkmyipnow.com
WHOIS Lookup ↗
Look up domain registration details.
whoislookuppro.com
Text tools
Word Counter ↗
Count words, characters and more.
wordcounterfree.com
Text Repeater ↗
Repeat text any number of times.
textrepeat.net
Transform Case ↗
Change text between letter cases.
transformcase.com
Password Strength ↗
Test how strong a password is.
passwordstrength.net
Number to Words ↗
Convert numbers into written words.
numtotext.com
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.com
Total Interest Calculator ↗
Total interest paid over a loan.
totalinterestcalc.com
SIP Calculator ↗
Project mutual fund SIP returns.
sipcalculatorhub.com
Calorie Calculator ↗
Daily calorie needs and macros.
calorieskit.com
BMI & BMR Calculator ↗
Body mass index and metabolic rate.
bmibmrcalc.com
Fraction Calculator ↗
Add, subtract and divide fractions.
fractionsteps.com
GPA Calculator ↗
Calculate GPA and CGPA from grades.
gpacalculatorhq.com
Voltage Drop Calculator ↗
Voltage drop by gauge and length.
voltdropcalc.com
AC Tonnage Calculator ↗
Size an air conditioner in tons.
actonnagecalc.com
Backup Power Calculator ↗
Size a generator or battery backup.
backuppowercalc.com
Solar Battery Bank Calculator ↗
Size a solar battery bank.
solarbatterybankcalc.com
Tank Volume Calculator ↗
Volume of tanks of any shape.
tankvolumecalc.com
Pool Volume Calculator ↗
Pool water volume in gallons or litres.
poolvolumecalc.com
Cubic Yardage Calculator ↗
Cubic yards for materials.
cubicyardage.com
Concrete Material Calculator ↗
Concrete, cement and aggregate needs.
concretematerialcalc.com
Roofing Material Calculator ↗
Estimate shingles and materials.
roofingmaterialcalc.com
Stair Calculator ↗
Stair rise, run and step count.
staircalculators.net
Construction Calculators ↗
Hub of construction calculators.
constructioncalchq.com
Cooking Measurement Converter ↗
Convert cups, grams and spoons.
measurechef.com
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.