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Practical guides and tutorials on SEO, security, performance, and developer workflows.

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Tools Oct 9, 2026 6 min read

Cleaning Up Messy Text: Remove Duplicates, Sort Lines, Strip Whitespace and Diff the Result

A working method for cleaning text: deduplicate lists, sort naturally, fix whitespace and line endings, normalise case, and diff the result, with free tools.

SEO · Jul 30, 2026

robots.txt and XML Sitemaps: The Setup That Gets Pages Indexed (and the Five Mistakes That Stop It)

Performance · May 5, 2026

Why High-Resolution Images Can Quietly Kill Conversion Rate

Tools Oct 9, 2026 6 min read

Cleaning Up Messy Text: Remove Duplicates, Sort Lines, Strip Whitespace and Diff the Result

A working method for cleaning text: deduplicate lists, sort naturally, fix whitespace and line endings, normalise case, and diff the result, with free tools.

text tools duplicate lines sort text

Web Development Oct 6, 2026 5 min read

Favicons in 2026: The Sizes You Actually Need, Which Formats to Use, and How to Generate the Whole Set

The favicon sizes browsers, iOS, Android and Google actually use in 2026, SVG vs ICO vs PNG, the HTML to include, and how to generate the set from one image.

favicon web development icons

Productivity Oct 1, 2026 6 min read

Finishing a PDF Properly: Page Numbers, Watermarks, Passwords and Form Fields Before You Send It

The last five minutes before a PDF goes out: matching page numbers, watermarks for drafts and confidential files, flattening forms, and passwords that protect.

pdf page numbers watermark

Development Sep 24, 2026 5 min read

Diagrams as Code: Using Mermaid and SQL-Generated ER Diagrams for Documentation That Stays Current

Why text-based diagrams beat drag-and-drop tools for docs, a Mermaid quick start for flowcharts, sequence and ER diagrams, and generating ERDs from SQL.

mermaid er diagram documentation

Security Sep 10, 2026 6 min read

How to Decode and Debug a JWT Safely (Without Pasting Production Tokens into Random Websites)

What is inside a JWT, how to read the claims, why a decoder cannot prove a token is valid, the claims behind most login bugs, and how to debug without leaks.

jwt authentication security

Development Aug 27, 2026 6 min read

The Seven JSON Errors You Will Hit Most, How to Read the Error Message, and How to Fix Each One

Trailing commas, single quotes, BOMs and other JSON mistakes that break builds: what each error means, how to find the line, and how to validate JSON online.

json debugging json validator

SEO Aug 13, 2026 6 min read

Schema Markup for Beginners: Which JSON-LD Types Actually Matter and How to Validate Them

What JSON-LD is, which schema.org types earn rich results in 2026, how to write them without errors, and how to validate your markup before Google does.

schema markup json-ld structured data

SEO Jul 30, 2026 4 min read

robots.txt and XML Sitemaps: The Setup That Gets Pages Indexed (and the Five Mistakes That Stop It)

What robots.txt and XML sitemaps do, how to write them, how search engines really use them, and the five mistakes that quietly keep pages out of Google.

robots.txt xml sitemap technical seo

Security Jul 16, 2026 6 min read

Blur Faces and Watermark Images Before You Share Them: A Practical Privacy Checklist

How to blur faces in photos, watermark images and PDFs so they cannot be passed off as someone else's, and strip the EXIF data that leaks your location.

privacy blur face watermark