PDFlow – Engineering PDF Scale, Measure & Markup

Scale, measure, mark up and calculate on engineering PDFs with built-in tools. Everything stays local.

Tired of switching between separate tools to scale drawings, measure PDFs, add markups and run simple calculations? PDFlow brings them together in one browser-based workspace. Built for engineers, architects, developers, planners, construction professionals, and anyone who regularly works with technical PDFs, PDFlow combines calibrated scaling, distance and area measurement, annotations, signatures, markup tools and built-in engineering calculators. Most PDF editors can annotate documents, but they are not designed around technical drawing workflows. PDFlow helps you calibrate plans, measure directly from drawings, complete quick calculations and export your marked-up PDF without leaving the browser. Your documents stay local. PDFlow does not upload your PDFs to an external processing server.