LONG EDGE · SHORT EDGE · VISIBLE PAGES UNCHANGED

Add a duplex printing preference to a PDF

Write long-edge or short-edge ViewerPreferences into a new PDF without adding, rotating, reordering, scaling or rasterizing visible pages.

PDF duplex metadata is a preference for compatible viewers and print drivers. Choose long edge for a typical portrait book stack or short edge for a typical landscape stack, then download a visually unchanged PDF. The hint can improve defaults, but it cannot force every copier to print two-sided. The operator must still confirm the print dialog.

Visible bytes preserved by page copyNo rasterizationAdvisory metadata only

Guide last checked and updated October 11, 2026 by the 55printing prepress team.

Pick your path

Two ways to get this done - both 100% free

FREE DUPLEX PREFERENCE WRITER

Choose the intended physical flip edge

No upload · visible pages are not rebuilt

Drop the ordered PDF page stack

Run Duplex Readiness first if orientation or page pairing is uncertain.

No file selected.

PDF metadata flag shown separately from unchanged page artwork
The preference lives in the PDF catalog; it does not create a second side or alter artwork.
Print operator confirming two-sided and flip edge settings
The physical device remains the final control even when the PDF contains a preference.

Metadata changes the suggestion, not the sheet

The converter writes ViewerPreferences DuplexFlipLongEdge or DuplexFlipShortEdge. It does not duplicate pages or create fronts and backs. The existing order remains the duplex stack: page 1 fronts page 2, page 3 fronts page 4, and so on.

A compliant viewer may preselect the requested edge. Another driver may ignore it. This is why the result always states that visible pages are unchanged and the operator still owns the final device setting.

How to add duplex metadata

  1. Confirm the page stack. Use Duplex Readiness to inspect pairing, orientation and odd-page risk.
  2. Choose a flip edge. Select the edge that keeps the physical backs upright for the binding direction.
  3. Open and print a sample. Verify the download looks identical, then select two-sided on the target printer.

Pick the intended duplex preference

Metadata choices and their usual physical reading
PreferenceTypical stackStill required
Long edgePortrait pages turning like a bookSelect two-sided and proof backs
Short edgeLandscape pages turning on the short sideSelect two-sided and proof backs
No preferenceDriver chooses its defaultSet every option manually
Inspect duplex readinessNormalize mixed pagesOrder double-sided color copies

Duplex metadata questions

What does duplex metadata change?

It changes the PDF catalog ViewerPreferences entry for Duplex. The selected value requests long-edge or short-edge flipping in compatible software. It does not change page artwork, count, order, dimensions or visible rotation. Compare the source and the download page by page before you send the file to a copier.

Will the printer automatically use duplex after this?

Not reliably. Some viewers and drivers use the preference as a default, while many production copiers require the operator to select two-sided printing. Treat the metadata as a helpful hint and verify the actual print settings. Print one front-and-back sheet on the device that will run the job.

Does the converter add blank pages?

No. It leaves page count and order unchanged. If an odd-page document needs an intentional blank back, add or approve that page before stamping metadata so later jobs do not shift the intended front-and-back pairs. Check the duplex readiness report when the count is odd.

Which option should I choose for portrait pages?

Long edge is the common book-style choice for upright portrait pages. Binding direction and printer wording can differ, so print one front-and-back sample and confirm that the back reads upright before producing the full quantity. Do not trust the menu name until that sheet is in your hands.

Which option should I choose for landscape pages?

Short edge is the common choice for landscape pages when they should turn like a horizontally bound book. If the job is top-bound or has mixed orientation, inspect the physical reading direction instead of relying on the common default. Mixed stacks need the mixed-page tool before this stamp.

Can I remove or change the preference later?

Yes. Run the original or previously stamped PDF through the tool again with the desired edge, or print with a manual override. Keep the untouched source because it remains the safest reference for page-content comparisons. A second pass replaces the hint. It does not stack a second copy of the pages.

We write the flip hint without touching the pages the customer approved

A two-sided brochure was approved, then the copier opened it as single-sided because the PDF never asked for duplex. We stamped long-edge on a copy of that file. The pictures did not move, the page count did not change, and we still had the operator select two-sided in the dialog. The stamp is a hint. It is not a promise that every RIP will obey it.

55printing uses this stamp when the visible art is already correct and only the preference is missing. We keep the untouched source in the folder. Daily. No ceiling.

Does 55printing stamp duplex metadata on approved files?

Yes, when the pages are already approved and the only missing piece is a long-edge or short-edge hint. We do not reorder or rasterize those pages. The operator still selects two-sided printing, because many copiers ignore ViewerPreferences.

A metadata stamp still needs the readiness report first

Check pairs and odd backs with the duplex readiness tool before you write the preference. Mixed page directions belong on the mixed-page bench, not inside this stamp.

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