What happens if I upload a single-sided PDF but select double-sided printing on Printster?

Printster will print on both sides of each sheet, placing page 1 on the front of sheet 1, page 2 on the back, and so on. Your layout just needs to anticipate that each pair of sequential pages will share a sheet.

How do I avoid content being hidden in the gutter when printing double-sided?

Add a gutter margin of at least 15 mm on the binding side, or use mirror margins in Word so the inner margin is consistently wider on both left and right pages. For thick documents (200+ pages), increase the gutter to 20–25 mm.

Can I print a landscape document double-sided?

Yes. Landscape double-sided documents should flip on the short edge so the top of the page stays at the top when you turn over a sheet. Ensure your duplex setting specifies short-edge binding, or let Printster's print team apply the correct setting.

My double-sided printout has even pages printing upside-down. What went wrong?

This is almost always a long-edge vs short-edge mismatch. A portrait document that accidentally uses short-edge (top) flipping will print the reverse side upside-down. Re-export the PDF without forcing duplex settings and specify the correct flip direction in the print order.

Does double-sided printing cost less than single-sided on Printster?

Double-sided printing uses fewer sheets of paper, so it is generally cheaper per page than single-sided for the same page count. Use Printster's instant quote calculator to compare the totals for your specific document.

What if my PDF has 100 pages but I only want certain pages printed double-sided?

Upload your full PDF and use the page range and print mode options in the configure step to specify which sections should be duplex. Alternatively, split the PDF into separate files before uploading.

How to Set Up Two-Sided Printing

To set up a PDF for correct double-sided printing, ensure your page count is even, that odd pages carry content meant for the right-hand side and even pages for the left, and that any facing-page margins or binding gutters are mirrored appropriately. Uploading a properly laid-out PDF to Printster and selecting duplex printing does the rest.

Double-sided printing — also called duplex printing — halves your paper consumption and produces a more professional-feeling document, but it only works correctly when the underlying PDF is set up with the page order and orientation the press expects. A PDF that works perfectly on a home inkjet printer can come out mirrored, upside-down, or misaligned when sent to a commercial printer without the right settings. The core issue is that printers flip pages either along the long edge (for portrait documents, the standard) or the short edge (for landscape documents). If your software or PDF is set to the wrong flip direction, every back page prints upside-down relative to the front. Getting this right at the file creation stage — in Word, Google Docs, InDesign, or LaTeX — is far easier than correcting it afterwards. This guide walks through the setup steps in the most common tools, explains binding gutter allowances for double-sided documents, and covers what to check before uploading to Printster.

Understanding Long-Edge vs Short-Edge Flipping

When a sheet passes through a duplex printer it is flipped — either along its long edge (like turning the pages of a book) or along its short edge (like flipping a calendar pad). The correct direction depends entirely on how your content is oriented:

Portrait document → flip on the long edge (left side). This is the standard for most documents.
Landscape document → flip on the short edge (top). This keeps the top of each side at the top.

In most print dialogs (and in Printster's duplex option) this is handled automatically, but if you are exporting a print-ready PDF and specifying duplex settings in the PDF properties, make sure you set the flip axis correctly.

Setting Up in Microsoft Word

Go to Layout → Margins → Mirror Margins if you want the gutter (inner margin) to be consistent on both sides of a spread.
Set your inner margin (gutter) 3–5 mm wider than the outer margin to account for binding.
Save as PDF: File → Export → Create PDF/XPS, quality set to Standard or High Quality.
In the print dialog or PDF options, do not set duplex — let Printster handle that based on your order configuration.

Setting Up in Google Docs

Google Docs does not support mirror margins natively. For simple double-sided documents (lecture notes, assignments), set equal margins on all sides (at least 15–20 mm) and the result will be acceptable. For bound documents with a significant page count, use Word or a dedicated layout tool.

Export via File → Download → PDF Document.

Setting Up in LaTeX

Add twoside to your document class option:

\documentclass[12pt,a4paper,twoside]{report}

LaTeX will automatically create mirrored margins and position page numbers on the correct outer edge. Use the geometry package to fine-tune gutter widths.

Checking Your Page Count

Double-sided printing works in sheets: each sheet carries two pages. If your document has an odd number of pages, the final sheet has a blank reverse side — which is fine, but you should be aware of it. PDFs sent to Printster with odd page counts are printed with the final page on one side and a blank on the reverse.

For booklets with saddle-stitch binding, the page count must be a multiple of four (4, 8, 12, 16…). If your content comes to an awkward count, add blank pages at the end.

Before You Upload to Printster

Confirm the page size matches your intended print size (A4, A5, etc.).
Check that binding-side margins are at least 15 mm (wider for thick documents).
Flatten all transparency and embed all fonts in your PDF export.
Select Duplex / Double-sided in the Printster configure step — do not pre-bake duplex instructions into the PDF file itself.

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Frequently asked questions

What happens if I upload a single-sided PDF but select double-sided printing on Printster?: Printster will print on both sides of each sheet, placing page 1 on the front of sheet 1, page 2 on the back, and so on. Your layout just needs to anticipate that each pair of sequential pages will share a sheet.
How do I avoid content being hidden in the gutter when printing double-sided?: Add a gutter margin of at least 15 mm on the binding side, or use mirror margins in Word so the inner margin is consistently wider on both left and right pages. For thick documents (200+ pages), increase the gutter to 20–25 mm.
Can I print a landscape document double-sided?: Yes. Landscape double-sided documents should flip on the short edge so the top of the page stays at the top when you turn over a sheet. Ensure your duplex setting specifies short-edge binding, or let Printster's print team apply the correct setting.
My double-sided printout has even pages printing upside-down. What went wrong?: This is almost always a long-edge vs short-edge mismatch. A portrait document that accidentally uses short-edge (top) flipping will print the reverse side upside-down. Re-export the PDF without forcing duplex settings and specify the correct flip direction in the print order.
Does double-sided printing cost less than single-sided on Printster?: Double-sided printing uses fewer sheets of paper, so it is generally cheaper per page than single-sided for the same page count. Use Printster's instant quote calculator to compare the totals for your specific document.
What if my PDF has 100 pages but I only want certain pages printed double-sided?: Upload your full PDF and use the page range and print mode options in the configure step to specify which sections should be duplex. Alternatively, split the PDF into separate files before uploading.