RedLinz

RedLinz is a browser-based visual markup tool built for human-to-AI handoffs. Instead of describing a UI tweak in words or handing an AI a raw screenshot and hoping it guesses right, you mark up the image directly.
Circle, arrow, or annotate with 12 standardized markup symbols — circle, arrow, rectangle, X stamp, checkmark, callout, number stamp, and more — each carrying meaning the AI can parse. RedLinz then exports a structured prompt with exact coordinates and labels instead of a flat image, so the agent stops guessing which element you meant.
Works with Cursor, Claude Code, ChatGPT, Perplexity, and Grok — or any AI tool that reads text and images. All annotation happens client-side; images never leave your browser.
Free forever for 5 markups/month, no card required. Upgrade to Pro ($8/mo or $82/yr) for unlimited, watermark-free exports.