GUIDE
Measuring and marking up
drawings on an iPad.
The tablet is the natural place to review a drawing — on site, in a meeting, on the train. Here is what works.
Can you mark up PDF drawings on an iPad?
Yes, and with Redline PDF there is no app to install: it runs in Safari and adds to the home screen from the Share menu, where it opens full screen. Your drawings are the same ones as on your desktop because they live in your account. One finger draws with a tool in hand; two fingers pinch to zoom and move.
A tablet is best for reviewing, freehand with an Apple Pencil, and counting. Long takeoff sessions and precise work at high zoom are still better on a desktop.
You do not need an app
Redline runs in Safari on an iPad and installs to the home screen from the Share menu ("Add to Home Screen"), where it opens full screen like any app — no App Store, no separate licence for the tablet, and one set of plans covers every device. Your drawings are the same ones as on your desktop, because they live in your account, not on a device.
What works well on a tablet
- Reviewing. Clouds, callouts, text and stamps are quick with a finger or a pencil, and pinch-zoom behaves as you expect.
- Freehand. An Apple Pencil draws pen strokes smoothly, and the smoothing setting takes out the wobble without flattening a deliberate line.
- Counting. Tapping fixtures on a plan is genuinely nicer on a tablet than with a mouse.
- Measuring. Once the sheet is calibrated, lengths, areas and counts are placed with a finger or the Pencil, and the totals stay visible while you work. Tap each corner of an area, then finish it by tapping its first corner again, double-tapping the last corner or pressing Finish on the bar that appears beside the readout.
What is better on a desktop
Long takeoff sessions, precise vertex placement at high zoom, and anything involving the properties panel and keyboard shortcuts. A tablet is for review and spot measurement; a desktop is for an afternoon of quantity takeoff. The same review runs on a Mac.
Working offline
Once the app has loaded, it keeps working if the connection drops mid-review — the editor itself runs on the device. Saving to your workspace resumes when you are back on a network. On a site with no signal, load the drawing before you go.
Getting the drawing there
Sign in on the iPad and every drawing in your workspace is already there. To bring in a new PDF, open it from Files, iCloud Drive or an email attachment — the editor accepts a file from anywhere iPadOS can share it.
Try it before you commit
Open the demo on the iPad — no account, no install — and mark up the sample drawing with your pencil. Two minutes tells you more than any feature list. Coming from Revu for iPad? See what Bluebeam retired, and what replaced it.
Do I need to install an app to mark up drawings on an iPad?
No. Redline PDF runs in Safari, and "Add to Home Screen" from the Share menu makes it open full screen like an installed app. There is no App Store purchase and no separate tablet licence — the same account works on the tablet and the desktop.
Does an Apple Pencil work for marking up drawings?
Yes. Pen strokes follow the Pencil smoothly, and the smoothing setting takes the wobble out without flattening a line you meant to draw. Clouds, callouts, text and stamps all work with a finger too.
Does it keep working without a signal?
Once the app has loaded, the editor runs on the device, so a connection dropping mid-review does not stop you. Saving to your workspace resumes when you are back on a network. On a site with no signal, open the drawing before you leave.
Next guide
Try it on the sample drawing
Redline runs in the browser — nothing to install. Open the demo to try tools on a sample drawing. Demo edits are temporary; your own files, saving, signatures, exporting, printing and downloads come with an account, which starts with 30 days of Pro, no card. Then Free unless you choose Plus or Pro; your drawings stay. Plus is $9 a month or $90 a year; Pro is $15 a month or $150 a year. Compare the plans.
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