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 this site.
Developer tools
Base64 Decode ↗
Encode text to Base64 or decode Base64 back to plain text instantly in your browser, with support for files and URL-safe variants.
base64decode.tools
URL Encode / Decode ↗
Percent-encode URLs and query strings or decode them back, handling special characters and reserved symbols correctly every time.
urlencodedecode.com
UUID Generator ↗
Generate UUIDs in every version — v1, v3, v4, v5 and v7 — singly or in bulk, ready to copy straight into your code.
uuidcore.com
JSON Tools ↗
Format, validate, minify and convert JSON with a clear error view, so you can spot and fix malformed data in seconds.
jsontools.tools
Hash Generator ↗
Generate cryptographic hashes including MD5, SHA-1, SHA-256, SHA-3, BLAKE2 and HMAC from text or files, all in the browser.
hashgenerator.tools
Crontab Cheat Sheet ↗
Build, read and debug cron expressions with a plain-English breakdown of every schedule, plus a handy reference of common patterns.
crontabsheet.com
Regex Guide ↗
Learn, build and test regular expressions interactively, with live match highlighting and explanations of each token as you type.
regexguide.com
CIDR Calculator ↗
Calculate subnets, CIDR ranges, network and broadcast addresses, and usable host counts for any IPv4 block in one place.
cidrcalculator.net
Subnet Mask Calculator ↗
Work out subnet masks, wildcard masks, network ranges and host counts from any IP and prefix length, with results explained clearly.
subnetmaskcalc.net
Epoch Time Converter ↗
Convert Unix timestamps to human-readable dates and back, across time zones and in seconds or milliseconds, with a live current epoch.
epochtime.tools
Color Code Kit ↗
Pick, convert and compare colour codes across HEX, RGB, HSL and more, plus check contrast ratios for accessible designs.
colorcodekit.com
Text tools
Word Counter ↗
Count words, characters, sentences and paragraphs in real time, with reading-time estimates and keyword density for writers and students.
wordcounterfree.com
Text Repeater ↗
Repeat any text or phrase a set number of times, with optional separators and line breaks — ideal for testing, templates and formatting.
textrepeat.net
Transform Case ↗
Change text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase and more, with instant one-click conversion and copy.
transformcase.com
Password Strength ↗
Test how strong a password is against common attacks, with instant feedback on length, complexity and estimated time to crack.
passwordstrength.net
Calculators
Age Calculator
Calculate your exact age in years, months and days from a date of birth, plus date differences, countdowns and more.
theagecalculator.net
Square Footage Calculator ↗
Calculate area in square feet for rooms, floors, walls and land from a range of shapes and units, with totals for multiple areas.
thesquarefootagecalculator.com
Percentage Calculator ↗
Work out percentages quickly — percentage of a number, percentage change, increase, decrease and more — with clear step-by-step results.
bestpercentagecalculator.net
Dimensional Weight ↗
Calculate dimensional (volumetric) weight for shipping using carrier divisors, so you can compare against actual weight and avoid surprises.
dimweightcalc.com
Box Volume Calculator ↗
Calculate the volume of a box or carton from its length, width and height in any unit, with instant conversion between measurement systems.
boxvolumecalculator.com
Girth Calculator ↗
Calculate package girth and combined length-plus-girth to check carrier size limits before you ship and avoid oversize fees.
girthcalculator.com
Margin vs Markup ↗
Compare profit margin and markup side by side, convert between the two, and work out selling price, cost or profit from any input.
marginvsmarkup.com
EMI Calculator ↗
Calculate loan EMIs for home, car and personal loans, with a full amortisation schedule showing principal, interest and balance over time.
indiaemi.com
Solar Calculator ↗
Estimate solar system sizing, panel count and expected output from your energy use and location, to plan an installation with confidence.
prosolarcalc.tools
Time & date tools
Hours Calculator ↗
Calculate the number of hours and minutes between two times, with support for overnight spans, breaks and decimal-hour totals for timesheets.
calculatehours.net
Clock With Us ↗
View an accurate online clock with world time zones, plus stopwatch, timer and date tools for everyday timekeeping.
clockwithus.com
Unit Cheat Sheet ↗
A quick reference for converting length, weight, volume, temperature and more, with common conversions laid out for fast lookup.
unitcheatsheet.com
File & image tools
Pic Toolkit ↗
Edit and convert images in your browser — resize, crop, compress and change format — without uploading files to a server.
pictoolkit.com
Remove Metadata ↗
Strip EXIF and other hidden metadata from photos and files to protect your privacy before sharing them online.
removemetadata.tools
Core PDF Tools ↗
Merge, split, rotate, compress and reorder PDF files quickly in the browser, with no watermarks and nothing uploaded to a server.
corepdftools.com
More calculators
Voltage Drop Calculator ↗
Calculate electrical voltage drop for a wire run.
voltdropcalc.com
Calorie Calculator ↗
Estimate your daily calories and macros.
calorieskit.com
Total Interest Calculator ↗
See the total interest paid over a loan.
totalinterestcalc.com
AC Tonnage Calculator ↗
Size air-conditioning tonnage for a room.
actonnagecalc.com
Tank Volume Calculator ↗
Calculate tank capacity and volume.
tankvolumecalc.com
Cubic Yardage Calculator ↗
Work out cubic yards for materials.
cubicyardage.com
BMI & BMR Calculator ↗
Body mass index and metabolic rate.
bmibmrcalc.com
Solar Battery Bank Calculator ↗
Size a solar battery bank.
solarbatterybankcalc.com
Fraction Calculator ↗
Add, subtract and simplify fractions step by step.
fractionsteps.com
Backup Power Calculator ↗
Size a backup power or generator system.
backuppowercalc.com
Cooking Converter ↗
Convert cooking measurements and units.
measurechef.com
Number to Words ↗
Convert numbers into written words.
numtotext.com
Stair Calculator ↗
Calculate stair rise, run and stringers.
staircalculators.net
Concrete Calculator ↗
Estimate concrete volume and materials.
concretematerialcalc.com
SIP Calculator ↗
Calculate mutual-fund SIP returns.
sipcalculatorhub.com
Roofing Material Calculator ↗
Estimate the roofing materials you need.
roofingmaterialcalc.com
GPA Calculator ↗
Calculate your grade point average.
gpacalculatorhq.com
Construction Calculators ↗
A suite of construction calculators.
constructioncalchq.com
Pool Volume Calculator ↗
Calculate swimming-pool water volume.
poolvolumecalc.com
Web & network tools
About these tools
These are free online tools from our wider network. Like The Age Calculator, they’re built to be fast, free and free of signups — each one focused on doing a single job well. External tools open in a new tab so you don’t lose your place here.