What Is PDF Metadata? How to Check a PDF’s Hidden Details
PDF metadata is the hidden information stored inside a PDF — its title, author, dates and more. Learn what it contains and how to check it before you share a file.
RGB vs HEX vs HSL: Colour Codes Explained (and Where CMYK Fits)
One colour, three notations. What HEX, RGB and HSL each mean, how to read them, when to reach for each one, and how to convert a colour between them without changing it.
How to Calculate a Time Duration Between Two Times
The simple minutes-since-midnight method for working out how long a stretch of time lasts, with worked examples for same-day spans, borrowing across the hour, and overnight spans.
What Is EMI? How a Loan EMI Is Worked Out
An EMI is the fixed monthly payment on a loan. This guide explains what it stands for, how the EMI formula works, and how principal, rate and tenure change the payment — with a worked example.
The Morse Code Alphabet: Chart and How It Works
The complete Morse code alphabet chart with dot-and-dash timing rules, numbers, punctuation and worked examples.
How Reading Time Is Worked Out (Words Per Minute Explained)
Learn how reading time is calculated from word count and words per minute, what the common speeds mean, and how to estimate any text’s reading time free.
How to Count Lines, Words and Characters in a Text File
Learn how to count lines, words and characters in a text file, what blank lines and wrapped lines do to the count, and how to check a whole saved file free.
What Is a Favicon? The Sizes You Actually Need (16, 32, 48)
What a favicon is, which sizes you actually need, and where each size shows up — plus how to generate the classic 16, 32 and 48 set free.
Why Your Converted WebP Isn’t Animated (GIF vs WebP Honestly)
GIF vs WebP explained: why your converted WebP is a still image, when animated WebP really works, and when to keep the GIF for email and sharing platforms.
Lossy vs Lossless Image Compression: What Actually Changes
Lossy vs lossless compression explained in plain language: what lossy discards, what lossless keeps, which formats use each, and how to pick the right one.