Guides
Short, practical guides that explain the method behind our tools, with links to the tool you can use right away.
On Page SEO Checklist: 19 Checks and What They Mean
On page SEO is everything you control on the page itself. This checklist explains the checks that matter, why they matter and how to test them, so you can fix a page in one sitting.
Guidehtaccess Redirects Explained: 301, 302, WWW, HTTPS and Rewrite Rules
A redirect sends visitors and search engines from one address to another. On Apache hosting, the .htaccess file is the usual place to set it up. This guide shows what each rule does and how to test it safely.
GuideText to Binary: How Words Become Binary Code
Computers store every letter as a number, and every number as binary digits. This guide shows how a word turns into 1s and 0s and how to reverse it.
GuideStrong Passwords and Passphrases: What Works and What Does Not
Length and randomness matter more than clever tricks. This guide explains how to build passwords and password phrases that are hard to guess and easy to manage.
GuideHow to Write Meta Titles and Meta Descriptions That Earn Clicks
Your title and description are your search result ad. This guide shows a simple way to write them so the right people click.
GuidePercentage Difference vs Percentage Change: Which One Do You Need?
These two ideas sound alike but answer different questions. Here is how to tell them apart and how to calculate each.
GuideFancy Text, Symbols and Invisible Characters: How Unicode Makes Them Work
Fancy fonts and symbols are not real fonts. They are Unicode characters that look different. Here is how they work and where they can cause trouble.
GuideBarcode Types Compared: Code 128, EAN 13 and UPC A
Not every barcode is for retail. This guide explains the common types, how check digits work and which one fits your job.