
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.
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Axonix is a free toolbox of 122+ browser-based utilities covering PDFs, images, AI text generation, developer helpers, and SEO — plus a curated directory of MCP servers and copy-ready agent skills for AI coding assistants. No signup, no install, no watermarks on the output.
Pre-configured skills for Claude, Cursor, Windsurf, OpenCode, and more. Teach your AI assistant SEO, design, content strategy, and development best practices.
Optimizes content for AI search engines — making pages discoverable, extractable, and citable by AI systems including Google AI Overviews, ChatGPT, Perplexity, Claude, Gemini, and Copilot.
Plans content strategy — identifies searchable vs shareable content, builds topic clusters, scores ideas by impact, and creates editorial calendars.
Removes signs of AI-generated writing — fixes inflated symbolism, promotional language, superficial analyses, em dash overuse, AI vocabulary, passive voice, and filler phrases.
Creates distinctive, production-grade frontend interfaces — typography, color, motion, spatial composition, and backgrounds that avoid generic AI aesthetics.
Audits, diagnoses, and fixes SEO issues — crawlability, indexation, Core Web Vitals, on-page optimization, content quality, and link authority.
Diagnoses crawlability, rendering, canonical, robots, sitemap, and indexation issues for modern web apps.
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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%.
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