Construction Drawing Markup Software
ContractorCounter gives contractors a focused markup workspace for reviewing construction drawings, adding context, checking measurements, tracking counts, and exporting clear PDFs.
Free account. No card required.
Exports and sharing require a paid plan or eligible card-required trial.
Explore the workspace
Every count stays on the drawing.
Click any tool to take over. This is the real workspace.
Sample drawing · scripted AI responses · changes stay in this preview. Reset clears your changes.
A closer look
01
Mark up the drawing where the work happens
Add callouts, arrows, text, stamps, highlights, and comments directly on construction PDFs so every note stays tied to the plan — the same toolset described as PDF markup software for construction, aimed at drawings rather than documents.
02
Measure and count with context
Calibrate scale, measure lengths and areas, and place count marks while the review is still visible on the sheet.
03
Export clean review evidence
Share marked-up drawings with clients, field teams, and estimating workflows without turning review notes into scattered screenshots. If a drawing arrives from Revu with its markups baked into the page, unflattening Bluebeam markups explains what can and cannot be recovered.
04
See a real markup on this page
The demo workspace above runs on a real sample floor plan. Let the guided tour play and it places an actual leader-line callout on the entry door's swing — the leader tip anchored to the door geometry, the note floating clear of the plan linework — which is the anatomy of a useful drawing markup: the comment is readable without covering what it comments on. Ask the assistant to "count the doors" and 5 numbered markers land on the same sheet. Everything you see is the production markup engine, not a mockup, and it works before you sign up — open your own drawing in it from the free PDF markup tool, no account required.
05
Review rounds that survive mistakes
A markup round is only as good as your ability to unwind it. Every change lands in the workspace activity log with who did what, markups save automatically seconds after you stop drawing, and snapshots preserve the state before a round so a bad review pass is a restore, not a redo. Real-time sharing means the reviewer watches markups appear with named live cursors instead of waiting for an emailed PDF.
See whether it fits your next job.
Start with your own drawing and check the workflow.
See how it works
Try the tools on a real drawing.
Explore the example below, or take over the workspace and try it yourself. No signup needed for this demo.
Common questions
Questions about Drawing markup software
What is construction drawing markup software?
It is software for adding annotations, measurements, comments, stamps, and count marks directly to construction drawings, usually PDFs. The distinguishing features against a generic PDF editor are construction-specific: scale calibration so measurements read in real units, count groups for symbols, and exports that keep the markups tied to the sheet they annotate.
Can my team mark up the same drawings at the same time?
Yes. Share a workspace by email invite or a copyable link and work on the same drawings together in real time — you can see who else is in the workspace, follow their live cursors on the sheet, and markups appear for everyone within seconds. Sharing is included on every paid plan and when you start a free trial; there is no separate collaboration product or session setup, and collaborators just need a browser.
Is ContractorCounter only for estimating?
No. Use it for drawing review and measurement on their own, or carry your counts and measurements into a Bill of Quantities, review rates, and prepare a quote in the same browser workspace.
Does it work in the browser?
Yes: ContractorCounter is fully browser-based, which means it runs on Windows, macOS, and iPad without an installer, a Windows-only desktop dependency, or a virtual-machine workaround for Mac users. Upload PDF or image drawings, calibrate the scale once per sheet, and the full markup, measurement, and counting workflow runs in the tab, at the desk or on site. Because the workspace lives in the browser, the same drawing opens identically on every machine, so the office and the field are always looking at the same markups without anyone syncing files or matching software versions. If your team has been locked out of desktop-first tools on Mac or iPad, this is the structural difference to test first.