Redline

Inject the Redline feedback widget into any web page — edit text, annotate, screenshot, and ship a feedback bundle to your agent.

Visual design review, source-aware. Capture in the browser, ship a clean bundle to your AI agent. Redline turns any web page into a markup canvas. Click the toolbar icon to inject it into the current tab — then edit text inline, drag/resize/hide elements, change link targets (href), draw region annotations, paste screenshots, and leave notes. When you're done, hit Save and Redline downloads a single ZIP containing: • session.json — structured edits, annotations, and notes (with stable CSS selectors so an agent can patch the source HTML) • session.md — a human-readable Markdown summary • All your screenshot attachments as separate image files Hand the ZIP to Claude Code, Codex, OpenClaw, Hermes, or any agent that can read files. They read the JSON, apply the edits to source, and ship. WHO USES IT • Designers reviewing AI-generated landing pages, decks, and HTML reports • Engineers self-reviewing their own pages before merging agent output • PMs / founders writing spec changes against a live staging URL • Anyone giving feedback on a deck, report, or web app WHY REDLINE (vs. screenshots, Loom, or "tighten this here") • Edits, not just descriptions. Change "Subscribe" to "Get started" by actually typing it — the JSON records both before and after. • Source-mappable. Every edit ships with a stable CSS selector + content hash, so an agent can apply changes to the source repo directly even if the file regenerated. • AI-native output. The schema is documented and stable. The companion Claude Code skill (open source) reads the ZIP and patches your HTML automatically. • No account, no backend, no telemetry. Everything happens in your browser. Output is a ZIP you control. THREE CORE SCENARIOS • HTML slide decks — Reveal.js, deck-stage, plain HTML slides. Redline detects each slide and tags every change with its slide number. • HTML reports & docs — RFCs, white papers, design briefs. Annotate sections, mark paragraphs. • HTML landing pages & web apps — Edit copy, move elements, draw region notes, paste reference screenshots. POWER-USER MODE If you're a developer working on local files (file:// or localhost), enable "Write to local folder" in Settings (right-click the toolbar icon → Options) to write feedback straight into your project's ~/.redline/sessions/ folder using the FileSystem Access API. Skip the ZIP step entirely. WHAT IT DOES NOT DO • No telemetry, no analytics, no servers. See privacy policy. • Cannot inject into chrome:// pages, the Chrome Web Store, or other extensions' pages (browser security, not a Redline limitation). • Cross-origin iframes need to be triggered separately. OPEN SOURCE Source, issues, and roadmap: https://github.com/Dongke-X/redline (MIT) The companion Claude Code skill ships in the same repo — install it and skip the extension entirely if all you ever review is local AI-generated HTML.