Digital Tools
Useful calculators and converters for files, data, time and modern digital life.
Everyday Digital Tools
Practical utilities for everyday writing, productivity, files and online tasks.
QR Code Generator
Free QR codes for links and Wi-Fi
Word Counter
Count words, sentences and paragraphs
Character Counter
Characters with and without spaces
Reading Time Calculator
How long your text takes to read
Text Case Converter
Sentence, title, camelCase and slugs
Password Strength Checker
Test how strong a password really is
Random Password Generator
Strong random passwords and passphrases
Time Duration Calculator
Hours between two times, minus breaks
Percentage Change & Difference Calculator
Percentage increase, decrease and difference
Image Compressor
Shrink JPG, PNG and WebP files
Image Resizer
Resize images to any size or preset
Text Compare (Diff Checker)
Highlight the differences between two texts
File Size Converter
Bytes, KB, MB, GB, TB and binary units
Data Transfer Time Calculator
How long a download or upload takes
Developer & Design Tools
Professional utilities for developers, designers and technical users.
HEX / RGB / HSL Colour Converter
Convert colours between every format
Colour Contrast Checker
WCAG AA and AAA contrast testing
URL Encoder / Decoder
Percent-encode and decode URLs
Base64 Encoder / Decoder
Encode and decode Base64 text
JSON Formatter & Validator
Validate, format and minify JSON
UUID Generator
Random version 4 UUIDs in bulk
Colour Palette Extractor
Build a colour palette from any image
Favicon Generator
Every favicon size from one logo
Unix Timestamp Converter
Epoch time to readable dates
Featured guide
The complete digital tools handbook
The Complete Guide to Everyday Digital Tools 18 Free Online Utilities to Save Time, Work Smarter and Stay Safe Online
Discover all 18 free Calcaroo Digital Tools, learn what each one does, when to use it, and how they can help you save time, work smarter and stay safer online.
Read guide