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Overlay one drawing on another

Two drawings laid over each other: red, blue, and what they share.

  • Tutorial
  • 2 min
  • Free and Pro
  • Checked with Fluah 1.0.34

Before you begin

Download the sample drawings: revision B is the current issue, revision A the one before it.

Where to find it

DocumentOverlay pages

Steps

  1. Open the current issue, Fitout rev B.pdf. Go to Document › Overlay pages.

    The Document menu, Overlay pages marked

  2. Pick the other drawing, Fitout rev A.pdf. Its page is matched for you. Click Overlay.

    Overlay: Fitout rev B Page 1 in red, Fitout rev A Page 1 (Auto) in blue, Overlay marked

  3. This sheet is red, the other blue. Lines they share are dark.

    The boardroom's door: revision B's in red, revision A's in blue, the rest dark

  4. Not lined up? Use Move, Rotate, Scale or By points.

    The overlay bar: the layers, Grid labels, Move, Rotate, Scale and By points marked

  5. Apply saves the overlay as a new PDF. Cancel takes it off.

    The overlay bar: Cancel and Apply marked
    The open file is never changed.

What’s next

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Updated 6 November 2026