More free tools
CorePDFTools is part of a small network of independent, free, no-nonsense web tools. No sign-ups, no nonsense — just tools that do one job well. Here's the whole family.
Time and dates
For working with timestamps, durations, and calendar math.
Epoch Time Converter
Convert Unix timestamps, ISO 8601, and specialty formats (LDAP, .NET ticks, Chrome, GPS, Excel, Julian Day).
epochtime.tools →Calculate Hours
Precision calculator for hours and minutes worked. Time-tracking math simplified.
calculatehours.net →Age Calculator
Calculate exact age from a birthdate — years, months, days, hours, seconds.
theagecalculator.net →World Clock
Compare times across cities and time zones, and coordinate across regions at a glance.
clockwithus.com →Encoding and decoding
Convert between text and binary formats safely.
Base64 Decoder
Decode any Base64 string to text or files. Auto-detects file types (PNG, PDF, ZIP).
base64decode.tools →Base64 Encoder
Encode any text or file to Base64. URL-safe variant supported.
base64encode.tools →URL Encoder/Decoder
Encode and decode URL-percent strings for API testing and debugging.
urlencodedecode.com →Data, hashing, and security
For developer-style workflows.
JSON Tools
Format, validate, minify, and convert JSON. Compare two documents.
jsontools.tools →Hash Generator
MD5, SHA-1, SHA-256, SHA-512 hashes for any text or file.
hashgenerator.tools →UUID Generator
Generate UUIDs in v1, v4, and v7 formats. Bulk generation.
uuidcore.com →Password Strength Checker
Test how strong a password is against real attack patterns.
passwordstrength.net →Crontab Cheat Sheet
Build and decode cron schedule expressions, with a quick reference for every field.
crontabsheet.com →Regex Guide
Test and learn regular expressions with live matching and a pattern reference.
regexguide.com →CIDR Calculator
Work out IP ranges, host counts and network blocks from CIDR notation.
cidrcalculator.net →Subnet Mask Calculator
Calculate subnet masks, network and broadcast addresses, and usable host ranges.
subnetmaskcalc.net →Remove Metadata
Strip EXIF and hidden metadata from images and files, right in your browser.
removemetadata.tools →Writing and calculators
Practical helpers for everyday tasks.
Word Counter
Count words, characters, paragraphs, and reading time.
wordcounterfree.com →Percentage Calculator
Compute percentages, changes, and differences.
bestpercentagecalculator.net →Square Footage
Calculate area for flooring, paint, real estate.
thesquarefootagecalculator.com →Text Repeater
Repeat any text or string a set number of times, with custom separators.
textrepeat.net →Case Converter
Convert text between upper, lower, title, sentence, camel and snake case.
transformcase.com →Margin vs Markup
Convert between profit margin and markup, and price products correctly.
marginvsmarkup.com →India EMI Calculator
EMI calculators for home, car, personal, education and business loans — built for Indian borrowers. Honest math, no lead-gen.
indiaemi.com →Math and measurement
Units, volumes, and everyday measurement math.
Unit Cheat Sheet
A quick reference and converter for length, weight, volume and other units.
unitcheatsheet.com →Box Volume Calculator
Calculate the volume of a box from its dimensions, in any unit.
boxvolumecalculator.com →Dimensional Weight
Work out shipping dimensional (volumetric) weight for couriers and freight.
dimweightcalc.com →Girth Calculator
Calculate parcel girth (length plus girth) for shipping size limits.
girthcalculator.com →Solar Calculator
Estimate solar panel output, system size and savings for your setup.
prosolarcalc.tools →Images and files
Quick image and file utilities that run in your browser.