PDFlow – Engineering PDF Scale, Measure & Markup

by ashainp · Workflow & Planning

Manifest V3 Free

View in Chrome Web Store Data as of 18 Oct 2026

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

Users

+8 in 30 days

Rating

5.0 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#111K

#93K among extensions

Version

1.6.4

updated 18 Aug 2026

Users

monthly, 3 months

Latest, 18 Oct 2026: 48 usersMove the mouse over the chart for any month

Ratings count

monthly, 3 months

Latest, 18 Oct 2026: 3 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About PDFlow – Engineering PDF Scale, Measure & Markup

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.