Blog
Plain-English guides to the jobs our tools do - the method behind the calculation, the format behind the code, and how to check a privacy claim yourself.
Guide: Percentage Calculator
How to Calculate a Percentage Increase (With Examples)
22 October 2026
The full method for percentage increase: the formula, three worked examples (a pay rise, a price jump and a fall), and the three mistakes that quietly produce wrong answers.
Read the guide
Guide: QR Code Generator
Wi-Fi QR Codes: The Format Explained
22 October 2026
A Wi-Fi QR code is just a line of structured text starting with WIFI:. Here is what every field means, why special characters need escaping, how big to print it, and the security fact nobody mentions.
Read the guide
Guide: Password Generator
How Strong Is Your Password? Entropy in Plain English
22 October 2026
Password strength is measured in bits of entropy, and the maths is simpler than it sounds: length times the logarithm of the character pool. Here are the real numbers, and why one more character beats every clever substitution.
Read the guide
Guide: Image Compressor
Which Online Tools Upload Your Files - and Which Never Do
22 October 2026
When a free tool site asks you to "upload" a file, your document usually travels to a stranger's server for processing. Some tools never do that at all. Here is the difference, and two tests that prove which kind you are using.
Read the guide