Why HTML files?
HTML is the native format of the web. It is what AI tools generate, what browsers render, and what engineers ship. Using it as the review format removes every translation layer between feedback and fix.
One file. Zero setup.
An HTML file is self-contained. No repo access, no staging environment, no credentials. Drop the file in — reviewers see it instantly with no install required.
Pixel-perfect fidelity.
HTML renders exactly as it will in a browser. Unlike PDFs or screenshots, spacing, typography, and interactive states are all live. Feedback is anchored to real elements, not image coordinates.
AI can read and rewrite it.
HTML is structured text. That means AI can parse every element, apply annotations precisely, and ship a corrected version in one pass — not a vague summary or a diff of guesses.
Every AI tool outputs it.
Whether you're using Claude, GPT-4o, Cursor, or v0, the output is HTML. Mrkup closes the loop: AI generates, humans review, AI applies the notes.
No reviewer account needed.
Share a link. Stakeholders open it in any browser and pin comments directly on elements. No login, no plugin, no friction — just feedback.
Version history that makes sense.
Each upload is a numbered version. Reviewers see what changed between v2 and v3 at a glance. No 'final_v2_REAL_revised.html' in anyone's inbox.
Ready to try it?
Start reviewing for free