Duplex (Double-Sided) Print Test
Duplex printing fails in more ways than "it just doesn't work": some printers skip the back side silently, some flip it upside down, and some print both sides but offset from each other. This test prints two pages with identical registration marks at every corner and the center — print both sides using your printer's duplex setting, then check that the back side exists, reads right-side up, and roughly lines up with the front.
If the button doesn't work, press Ctrl+P (Windows/Linux) or Cmd+P (Mac) to open your browser's print dialog.
This is an on-screen preview. Your printer, paper, ink or toner level, and print driver settings all affect the final physical result.
How to use this printer test
- In your print dialog, turn on "Two-sided" or "Duplex" printing before you print — this test is a normal two-page document, so your printer handles the actual flipping.
- If your printer offers a choice, try "Flip on long edge" first (the most common default for portrait documents); you can test "Flip on short edge" separately afterward.
- Choose your paper size above; the preview updates instantly to show both pages.
- Print once, then hold the finished sheet up to a light source (a window works well) to compare the front and back marks.
What should the printed page look like?
The back side isn't blank
The most common duplex failure is the simplest: the second page never gets printed at all, and you're left holding a blank back side. If that happens, duplex isn't actually engaging — check your printer's driver settings rather than the alignment.
"BACK — SIDE 2" reads right-side up
Flip the sheet over top-to-bottom, like a page in a book. If the back label reads upside down, your printer's flip convention (long-edge vs. short-edge) doesn't match this page's orientation — try switching that setting in your print dialog.
Corner marks roughly line up when held to light
A small offset (a millimeter or two) is normal duplex tolerance. Which pair of corners appears to swap sides depends on whether your printer flips on the long or short edge — that swap itself is expected, not a defect. A large, inconsistent offset across all four corners points to a real registration problem.
Consistency across multiple prints
Run the test two or three times. If the offset changes noticeably between prints, the issue is likely inconsistent paper feeding rather than a fixed mechanical misalignment.
Common printer problems
The back side never prints — only the front comes out
Likely cause: Duplex printing wasn't actually enabled in the print dialog, or your printer model doesn't support automatic duplex and needs the sheet manually re-inserted.
How to fix it: Check the print dialog for a "Two-sided" or "Duplex" option before printing; if your printer only supports manual duplex, follow its instructions for re-inserting the sheet after the first side finishes.
The back side prints upside down relative to the front
Likely cause: A mismatch between the duplex flip setting (long-edge vs. short-edge) and the document's orientation.
How to fix it: Switch the flip-edge setting in your print dialog and print again — for most portrait documents, "flip on long edge" is correct.
The two sides are visibly offset by several millimeters or more
Likely cause: Inconsistent paper feeding through the duplex path, or a printer that genuinely struggles with back-side registration on the paper you're using.
How to fix it: Try a different paper stock (some thinner or coated papers feed less predictably through the duplex mechanism), and make sure the paper stack is loaded evenly against the tray guides.
Frequently asked questions
How do I test if my printer's duplex (double-sided) mode works correctly?
Print this two-page test with duplex/two-sided printing enabled in your print dialog, then check that the back side exists, reads right-side up when you flip the sheet like a book page, and that the corner marks roughly line up when held to a light.
Why does my printed back side come out upside down?
This usually means your printer's duplex flip setting (long-edge vs. short-edge) doesn't match your document's orientation. Switch that option in the print dialog and print again.
Is a small offset between front and back normal?
Yes — a millimeter or two of offset is within normal duplex tolerance for most printers. Only a large, consistent offset across all corners indicates an actual registration problem.