MarkUp

What it does

Working with AI agents on web changes? Stop typing long descriptions. MarkUp lets you annotate any webpage directly — draw what you want changed, label it, and send a structured visual brief to Claude, ChatGPT, or Copilot. Free. No accounts.

MarkUp is a free Chrome extension for annotating live webpages and exporting structured AI change requests. Draw your changes. Export a brief. Ship faster.

Annotate directly on your live website. Send it to your AI agent. Done. Draw on live pages. Label every change. Export a ready-to-paste brief. MarkUp turns visual feedback into a structured AI prompt. Click the icon, draw on the page, send it to Claude, ChatGPT, or your local agent. Click the extension icon — or use the keyboard shortcut to open it instantly, without leaving your keyboard. The annotation canvas overlays the live page — no devtools, no Figma. Drop callouts, sketch arrows, label what’s wrong. Each marker is auto-numbered and added to a live changelog. One click copies a PNG and a markdown changelog with CSS selectors. Paste into Claude, or save to a folder your agent…from markupextension.com

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  MarkUp for Chrome2020 · chromewebstore.google.com · ▲387

  Turn any URL into a canvas for feedback from your browser

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  Review my project: MarkUp, a tool to draw on any webpage.2010 · markup.io · ▲90

  Here's the website: http://markup.io/ We created MarkUp at Medium to help make the QA process better for sites we're working on. Grab the MarkUp bookmarklet, go to some page in your browser, then click it to draw on the page. Publish to make a link you can share. We've tried similar tools like BounceApp, Notable, and Skitch. Everything else we found is screenshot-based or takes us out of the browser. We wanted something that felt quicker than screenshots and more integrated with the browsing experience. Instead of taking a screenshot, MarkUp snapshots the DOM in the current page, strips the…

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  MarkUp2020 · markup.io · ▲442

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  Markdown StudioDec 2025 · mdstudio.app · ▲126

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  AgentEchoJan 2026 · github.com · ▲89

  Annotate any webpage UI and export feedback as Markdown

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  markup.oneFeb 2026 · tday.com · ▲12

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