PDF Annotation Tool
for Construction Plans
Mark up construction plans with text notes, callouts, arrows, revision clouds, stamps, and freehand drawing. Eleven geometry and text tools reshape with grab handles, while a partial-stroke eraser corrects freehand and highlighter ink. Your setup follows your account, and everything exports to a flat PDF that opens in any reader.
How to Mark Up PDF Construction Plans
Upload Your Plans
Drop your PDF into the browser. Every page renders at full resolution. Multi-page plan sets load just like singles.
Pick a Markup Tool
Choose from text, callouts, arrows, clouds, shapes, lines, freehand, highlighter, or stamps. Pick a color, size, and outline style, and the tool remembers your setup.
Place and Refine
Place the markup, then drag it to reposition. Geometry and text tools reshape with square handles, freehand and highlighter use the partial-stroke eraser, and text edits in place on double-click.
Export or Share
Export an annotated PDF with all your markups on the original plans, plus an optional markup summary. Open it in any PDF reader. Everything appears exactly where you placed it.

Why Plan Markup Matters on Every Job
Every construction project communicates through the drawings. When a pipe conflicts with a beam, the sub needs to mark that directly on the plan so the PM, the GC, and the engineer all see the same thing. When field conditions differ from what was designed, a note on the sheet carries more weight than a text message because it is tied to the exact location on the building where the problem exists. Annotations on the actual plans are the fastest way to capture and communicate changes.
A report from the National Institute of Standards and Technology estimated that poor information exchange costs the U.S. construction industry $15.8 billion per year. Contractors and specialty trades bear a significant share of that cost through time lost requesting, verifying, and recreating project information that should already be documented on the plans. Markups placed directly on the construction drawings close that loop. A revision cloud around a changed detail, a stamp marking a sheet as approved, or a text note flagging a field condition gives every person on the project the same information in the same place.
Industry standard contracts like AIA A201 General Conditions require the contractor to maintain a record set of the construction documents showing changes made during construction. Annotations are how that record gets built. The line tool handles dimensions, the area tool handles square footage, and the annotation tools handle everything that needs to be communicated visually on the drawing.
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Thirteen Markup Tools, One Toolbar
Every markup a plan reviewer needs, from quick text notes to formal approval stamps. All 13 can be moved and restyled after placement, with grab-handle reshaping on 11 geometry and text tools and partial-stroke erasing for ink.
Text Notes & Labels
Click anywhere on the plan to place a text annotation. Type your note and it appears directly on the drawing with a white halo that keeps the text readable over any line weight or background color. Double-click to edit existing text in place. Press Shift+Enter for a new line within the same note. Press T to switch to the text tool from any other tool.
Callouts & Arrows
A callout is an arrow and a note in one markup: click the detail you want to point at, click where the note should sit, and type. Edit the text later and the leader stays attached; drag its handles to move the note, the elbow, or the point it targets. Plain arrows are one click lighter when the drawing speaks for itself. Press O for callout, W for arrow.
Revision Clouds & Shapes
Draw the scalloped revision cloud every plan reviewer recognizes: click one corner, then click the opposite corner. When the change does not fit a rectangle, the polygon cloud traces any outline corner by corner with the same scalloped edge, and you watch the cloud take shape as you click. Rectangles, ellipses, and polygons outline regions, each with a solid or dashed edge and an optional light fill. Hold Shift to constrain a perfect square or circle.
Lines, Freehand & Highlighter
Straight lines and multi-point polylines carry your linework, with an arrow or dot cap on either end for flow directions and leader lines. Freehand drawing lets you circle a problem or sketch a quick routing change, and the highlighter overlays a semi-transparent color that never hides the drawing beneath it. When a stroke overshoots, the eraser trims just the part you sweep instead of deleting the whole mark, cutting cleanly where the ink crosses the eraser. Everything renders with smooth strokes for a clean result.
Stamps, Preset & Custom
Place preset labels with a single click: Approved, Rejected, Revised, For Review, Preliminary, and Void. Or type your own stamp text, so your initials or the status word your team actually uses becomes a one-click stamp. Each stamp renders as bordered text at the size and color you choose, and exports with the plan so the status is visible to everyone who opens the file.
Edit and Correct After Placing
Eleven geometry and text tools expose square grab handles: corners resize a shape or cloud, an arrow tip moves independently of its tail, and polygons expose every vertex. Freehand and highlighter keep their natural strokes and use the partial-stroke eraser for corrections. Drag any markup to move it, restyle it from the properties panel, or select several at once and change their shared style in one undoable step.
Set It Once, Not Every Time
The color and size you pick for a tool is what it uses next time, in every project, on every device you sign in on. A tool you have never given a color starts at the color you last picked, so your own look takes one choice instead of one per tool. Need the same note twice? Right-click it and choose Duplicate.
Fast on the Keyboard
Every markup tool has a keyboard shortcut: T for text, W for arrow, O for callout, and a Shift layer for the rest of the family, where Shift turns a measurement key into its markup twin. N re-arms whatever markup tool you used last. The full map lives in the shortcuts panel, one press of the question mark away.
Why Marking Up Printed Plans Fails on Real Projects
Red pens, sticky notes, and text messages work until the project gets complicated. Here is what goes wrong.
Red Pen Marks Do Not Survive the Scanner
You redline a set of prints in the field with a red pen. The GC scans them back to the office. Half the marks are washed out, the handwriting is unreadable on screen, and the arrow that pointed to the pipe conflict now points to empty space because the scan was slightly cropped. You get a phone call asking what you meant by the mark on sheet M-3.
Photos and Texts Lose Context Without the Drawing
You send a photo of a beam conflict to the office with a text: "problem near column B4." The PM looks at sheet S-2 and cannot find column B4 because it is on S-3. By the time they figure out which sheet, you have moved on and the phone call takes 15 minutes to reconstruct what you could have shown in seconds with a cloud and an arrow on the actual plan.
Nobody Knows Which Markup Set Is Current
The architect issues revision 3 of the floor plan. Three people mark it up with different notes. Two sets are on paper, one is in an email attachment. The super on site still has revision 2 with notes that were never transferred to the new sheets. The crew builds from the wrong markup because nobody can tell which set goes with which revision.
You Remark Every Revision from Scratch
New drawings arrive and every note, every RFI cloud, every approval stamp from the previous revision has to be recreated on the new sheets by hand. On a 30-sheet set, that is hours of work just to get back to where you were before the revision landed. If you skip a note, someone builds from an unmarked sheet and finds the problem in the field.
PDF Annotation & Markup Questions
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