All Free Tools Directory

Browse over 500 online calculators, converters, and utilities

All Calculators Finance & Money Math & Algebra Health & Fitness Date & Time Age & Birthday Converters Percentage Tools Business & Sales Text Tools Writing & Content Developer Tools Web & Internet SEO & Marketing Image Tools PDF Utilities File Tools Security & Privacy Password Tools Color Tools CSS Generators HTML Tools JSON Tools XML Tools CSV Tools Unit Converters Time Zone Tools Education & Learning Student Tools Random Generators Generators Productivity Tools Social Media Tools Marketing Tools YouTube Tools Image & Graphic Tools Data & Statistics Network & IP Tools Encoding Tools Decoding Tools Utility & Everyday Audio & Media
W

Modern WebP Image Converter

Use our free online Modern WebP Image Converter for quick calculations, verifiable formulas, and complete data privacy.
I

Invert Image Colors Negative Effect

Use our free online Invert Image Colors Negative Effect for quick calculations, verifiable formulas, and complete data privacy.
F

File Size Units Converter (KB, MB, GB)

Use our free online File Size Units Converter (KB, MB, GB) for quick calculations, verifiable formulas, and complete data privacy.
M

Interactive Musical Metronome (20 - 240 BPM)

Use our free online Interactive Musical Metronome (20 - 240 BPM) for quick calculations, verifiable formulas, and complete data privacy.
B

Birthday Calculator

Find out what day of the week you were born on, your exact days alive, and milestone birthdays.
C

Cat Age Calculator

Convert cat age into equivalent human years across kitten, junior, adult, mature, and senior stages.
H

Half Birthday Calculator

Find the exact 6-month half birthday date from your birthday.
Z

Zodiac Sign Calculator

Discover your Western zodiac sun sign, element, ruling planet, and date span.
L

Life Expectancy Estimator

Estimate statistical life expectancy based on age, gender, exercise, and lifestyle factors.
D

Days Alive Calculator

Find out exactly how many days, hours, minutes, heartbeats, and breaths you have experienced.
D

Date Difference Calculator

Calculate the exact difference between two dates in years, months, weeks, days, hours, and minutes.
D

Date Calculator

Add or subtract days, weeks, months, or years from any given date.
H

Hours Calculator

Calculate total working hours, elapsed time, and pay with meal break deductions.
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Minutes Calculator

Convert and calculate total minutes, elapsed minutes, and breakdown into hours and days.
S

Seconds Calculator

Convert seconds into days, hours, minutes, and perform second arithmetic.
B

Add Business Days Calculator

Add N business days to a start date, skipping weekends and finding the target delivery date.
A

Add or Subtract Days Calculator

Easily add or subtract any number of days from today or any chosen calendar date.
W

Week Number Calculator

Find the ISO 8601 week number, total weeks in the year, and week range for any date.
J

Julian Date Calculator

Convert Gregorian calendar dates to Julian Day Number (JDN), Modified Julian Date (MJD), and vice versa.
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Time Duration Calculator

Calculate exact elapsed time between two timestamps with 12h/24h support.
T

Time Zone Converter

Convert local times between all international time zones (UTC, GMT, EST, PST, CST, BST, IST, JST).
E

Epoch Timestamp Converter

Convert Unix epoch timestamps to human-readable dates (GMT and local) and vice versa.
T

Timestamp to Date Converter

Convert numerical Unix timestamps into formatted UTC and local date-time strings.
D

Date to Timestamp Converter

Convert any human calendar date and time into Unix epoch seconds and milliseconds.