What is website markup?

Website markup is the process of adding annotations — comments, pins, arrows, highlights, or drawings — directly onto a website’s visual design to communicate what needs to change. It bridges the gap between someone who sees a problem and the developer who needs to fix it.

The term covers both the act of marking up (annotating a live page or rendered view of the site) and the tools that make it possible.

How website markup works

Most website markup follows a similar pattern:

A live, interactive view of the website is rendered
A reviewer clicks on or near the area that needs attention
They add a comment, drawing, or annotation explaining the change
The developer receives the marked-up view with context

The goal is to replace vague feedback (“the header looks off”) with precise, visual communication (“this button needs to move 20px down”).

Website markup vs. bug tracking

Website markup focuses on visual communication — showing someone exactly what to change. Bug tracking is a broader workflow that includes prioritization, assignment, status tracking, and developer metadata like console logs.

Some tools (like BugHerd and Marker.io) combine both. Others (like Simpl_Markup) focus on simple markup and feedback without the overhead of a full bug tracking system.

Common markup methods

Click-to-comment — click directly on a live page to pin a comment at a specific location (the modern default)
Screenshot annotation — take a static image of the page, draw on it, and share it (the legacy approach that pre-dates live-page tooling)
Video walkthroughs — record yourself browsing and narrating (using tools like Loom)
Live site overlays — a sidebar or widget on the live site that lets users click elements and leave comments