Operion MarkSphere

Drawing markup software for architects, engineers, and field teams.

MarkSphere puts plan sets in the browser: upload PDF drawings, mark them up together in real time, keep every annotation attributed to its author, and download the marked-up sheet or the clean original whenever the drawing has to leave the building.

PDF markup in the browser

Upload PDF drawings into projects with progress and validation, then draw shapes, write notes, and edit annotations directly on the sheet — no desktop CAD seat or PDF license required.

Together, live, and attributed

Teammates mark up the same sheet at the same time, and every annotation carries its author and timestamp — attribution the server enforces.

Downloads and project links

Export the marked-up PDF with annotations flattened in, or the untouched original — per document or all at once — and link the drawing workspace to its ProjectSphere project.