RedLinz is a web based tool designed to help teams communicate visual changes for web design, app builds, and graphics to AI agents. The core function is to allow users to annotate screenshots or images using a set of twelve semantic symbols such as circles, arrows, rectangles, text notes, and highlights. Instead of writing lengthy descriptions of what needs to change, users mark up the image directly. The tool then generates a structured AI prompt that includes coordinate data, annotation types, and precise instructions. This prompt can be pasted into AI tools such as ChatGPT, Claude, Cursor, Perplexity, Grok, or others. The exported prompt is machine readable, enabling the AI assistant to understand exactly which elements to modify and how. The application operates entirely within the browser, with all annotation processing happening client side. No images are uploaded to external servers. Users can upload an image, paste a screenshot, or start with a blank canvas. The annotation workspace loads instantly without requiring any installation. After marking up the image, RedLinz captures an annotated screenshot and generates the structured prompt. Exports include a small watermark for the free tier. The free plan offers five markups per month, with no credit card required, and resets on the first of each month. The Pro plan provides unlimited markups, clean unwatermarked exports, access to all twelve annotation tools, export to any AI assistant, and all future updates. An annual subscription is available at a discounted rate and includes early access to beta features and direct support from the team. Typical use cases include developers and designers reporting bugs to Cursor or Claude Code by circling the specific button or broken element rather than describing it in paragraphs. Founders can mark up a landing page and hand ChatGPT a structured brief to improve weak sections. Designers can revise AI generated images by circling the wrong hand, off brand color, or extra letter, and export a targeted revision prompt. Marketers can annotate creative drafts and export a prompt for rapid revisions. Engineers can number stamp a screenshot in the order changes should be made, add notes, and export a spec that an AI or human teammate can follow step by step. The tool is also used for feedback on Figma exports, staging sites, and ad creatives, reducing the need for follow up clarification.