
How to Create a Professional Invoice (Free, With Tax Done Right)
What a valid invoice actually needs, how to number invoices for an audit, which VAT or GST rate to charge, and how to produce a real PDF without paying for invoicing software.
Deep dives into productivity, code, and design — written by developers, for developers.

What a valid invoice actually needs, how to number invoices for an audit, which VAT or GST rate to charge, and how to produce a real PDF without paying for invoicing software.

WebAuthn Level 3 became a W3C Recommendation in August 2026, five years after Level 2, and passkeys now sit behind billions of active credentials. This guide walks through the cryptography that makes a passkey unphishable, the new Level 3 features, and a staged rollout plan for an app that still has password users.

A hands-on engineering guide to LLM tokens. We break down Byte-Pair Encoding quirks, hidden whitespace costs, prompt caching mechanics, and the exact context architecture that reduced our production AI bill by 68%.

A foundation model alone cannot edit files, run test suites, or debug code. Explore how modern coding agent harnesses like OpenCode, Claude Code, and DeepSeek scaffold raw LLMs with tool dispatch loops, subagent pipelines, and context compaction engines.

I have a confession: I haven't read a full PDF in months. Here's my workflow for staying informed without drowning in documents, and why I summarize in the browser.

Why we believe in open source, and a detailed look at our flagship community projects: PocketMCP for Android AI and ClearBox for Gmail cleanup.

Stop copy-pasting into random websites. Here's what Base64 encoding actually does, where it's used in real systems, and a free tool to encode and decode instantly.

I tested every major AI image generator so you don't have to. Here's what's actually free, what's actually good, and what secretly charges you.

A comprehensive comparison of free PDF merger tools in 2026. Learn what to look for, why browser-based tools process files locally, and how to merge PDFs without uploading them to third-party servers.

Can twenty-five minutes of focused work change your productivity? Here's why the Pomodoro Technique works, how to customize it, and the mistakes most people make.

A practical workflow for merging, splitting, and compressing PDFs directly in your browser. No desktop software, no uploads.

Check your Body Mass Index in seconds. Here's what the number means, where BMI falls short, and why it's still useful as a starting point.