Drawing revision comparison
Compare PDF drawings and make revision changes easier to inspect.
Bring drawing versions into one desktop review workflow, inspect their differences, and mark the areas that need a decision, RFI, or handoff note.
Built for the review that follows an addendum or revised issue: compare the two sheets, then record the decision, RFI, or coordination note on the drawing.
Free with no trial timer: markup, review, calibration, 3 hand-created measurements per document, and Revision Package viewing. Symbol Search, plugins, and Revision Package changes or publishing require Pro.
01 / WHY
A detected change still needs project context.
A comparison can show that pixels differ, but the reviewer decides whether the change affects scope, constructability, pricing, or coordination. PolyPDF pairs visual comparison with markup tools so the next action can be recorded on the drawing.
02 / WORKFLOW
From source PDF to a result you can review.
- 01
Confirm the two source sheets
Check sheet number, revision, page size, orientation, and scale before treating visual differences as design changes.
- 02
Run the drawing comparison
Use the current and prior PDFs to surface regions that differ and focus the review on likely revision areas.
- 03
Inspect each meaningful change
Distinguish actual design revisions from title-block updates, raster noise, shifted scans, or alignment differences.
- 04
Mark the required response
Add a revision cloud, callout, note, or stamp where the team needs clarification, pricing, coordination, or acknowledgement.
03 / FIT
Move from “something changed” to a reviewable action.
- Supports a local desktop workflow for sensitive drawing sets.
- Keeps comparison findings beside normal PDF navigation and review tools.
- Lets reviewers add clouds and callouts around meaningful revision areas.
- Preserves a marked PDF that can enter the existing project record.
- Works on Mac and Windows for mixed-platform project teams.
Start with the free app. Pay once to unlock every Pro workflow.
Use PolyPDF 1.x forever on up to 3 Mac or Windows computers. Every PolyPDF 1.x update is included. Future major versions may be optional paid upgrades.
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04 / FAQ
Questions before you test it.
What should I check before comparing two drawings?
Confirm the sheet identity, revision, orientation, page size, and scale. A shifted scan or differently cropped sheet can create visual differences that are not design changes.
Does comparison replace a formal revision review?
No. It helps focus attention, but the issued revision record and a qualified reviewer remain authoritative. Every detected difference still needs context.
Can I mark up the differences afterward?
Yes. Use revision clouds, callouts, text, shapes, and stamps to record what the team needs to review or act on.
Should I use Compare Documents or a Revision Package?
Use Compare Documents for a focused visual diff between two PDFs. Use a Revision Package when a complete drawing issue needs sheet reconciliation, carried review work, change and impact review, references, and controlled publication.