Tutorial
Measure on PDF pages
PDF.js renders each page locally; you measure on the rasterised canvas like any image.
1. Open the PDF
Choose a PDF from the sidebar. The first page renders in a few seconds. Multi-page documents show a page stepper — measurements on one page do not carry to the next.
2. Measure as usual
Use the Angle, Chain, or Length tool on the rendered page. Zoom in on fine details before placing points.
3. Export annotated output
PNG at 2× or 4× captures the overlay at print resolution. SVG stays vector. For a packaged hand-in, use Download report to get HTML with image and data table.