How to Prepare a PDF for Printing: Page Size, Margins, Color and More

2. Margins and the non-printable area

Almost no desktop printer can print to the very edge of the paper. Most leave 3 to 6 mm unprinted on each side, sometimes more at the bottom. Anything placed in that zone, such as page numbers set very close to the edge, footers or full-bleed backgrounds, gets cut off or prints with a white border.

Fixes:

• Keep important content at least 10 mm from every edge.
• If page numbers or footers sit too close to the edge, re-add them with more margin. Add Page Numbers lets you set the distance from the edge; 10 mm (about 28 points) is safe for most printers.
• If a document has wide white margins you don't want, trim them with Crop PDF, but leave enough room for the printer's own margin.
• For scanned documents with dark scanner borders, crop the borders off so they don't print as black bars and waste toner.

3. Colour, grayscale and print charges

Colour printing costs more everywhere: ink cartridges at home, per-page charges at a copy shop, department budgets at work. Many office printers and copy shops count a page as colour if it contains any colour, even a single blue hyperlink or a coloured logo in the footer.

If the document doesn't need colour, convert it before printing with Grayscale PDF. That guarantees black-and-white pricing regardless of how the printer counts. The default mode keeps text as sharp vector text; if colour remains in gradients or special elements, the "guaranteed gray" mode renders pages as gray images.

Selecting "Black and white" in the print dialog works too, but drivers convert colours differently. Light colours may disappear, coloured text may print pale, and some shops still detect the file as colour. Converting the PDF gives you a predictable result you can check on screen first.

Check charts and highlights after converting

Two things can go wrong in grayscale:

• Charts with lines or bars distinguished only by colour may look identical in gray. Add labels, patterns or direct annotations if the chart matters.
• Highlighted text becomes a gray band. Light highlights stay readable; dark ones can hide the text.

4. Orientation and rotation

Mixed orientation is fine in a PDF: a landscape table can sit between portrait pages. Printers handle it, but you need the pages to be correctly rotated in the file. Sideways scans print sideways.

Open the PDF and scroll through. If pages appear rotated, fix them with Rotate PDF, choosing only the affected pages. For duplex printing of landscape pages, also check the print dialog's "flip on short edge" or "flip on long edge" setting, which decides whether the back of a landscape page comes out upside down.

5. Page order and page count

Before printing a long document:

• Check the order. Scans and merged files often have pages out of sequence. Organize PDF shows thumbnails you can drag into place.
• Remove blank pages you don't want printed, with Delete PDF Pages. Duplex scans are a common source.
• Add page numbers if the document doesn't have them. Loose printed pages get shuffled, and numbers make reassembly trivial.
• Think about duplex. For double-sided printing, a document whose chapters must start on a right-hand page may need blank pages inserted. For a simple report, it doesn't matter.

6. Image quality

Images that look fine on screen can print poorly.

• Resolution: screens show 100 to 200 pixels per inch; printers need around 300 for sharp photos. An image that's 800 pixels wide looks fine on screen but prints soft if it fills a whole A4 page (it would only be about 100 pixels per inch).
• Compression: heavily compressed PDFs print with blocky artefacts. If you compressed the file for email, print from the original instead. If you must compress a print file, use the Light level in Compress PDF.
• Brightness: screens are backlit, paper isn't. Photos often print darker than they look. For important photos, print one test page first.

7. Fonts

Missing fonts cause wrong characters or substitutions. PDFs created by mainstream software embed fonts by default, so this rarely affects everyday printing. Print shops sometimes ask you to confirm that "all fonts are embedded". You can check in your reader's document properties under Fonts: every font should say "Embedded" or "Embedded Subset".

8. Forms

Filled-in forms sometimes print blank or show only some answers, because form field values live in a separate layer that some print drivers ignore. Flatten the form before printing with Flatten PDF: the values become part of the page and print reliably everywhere.

9. Print settings that matter

In the print dialog, look for:

• Scale: "Actual size" for exact reproduction, "Fit" when paper and page sizes differ.
• Pages: print a range to test before printing everything.
• Duplex: single-sided or double-sided, and which edge to flip on.
• Colour: black and white if you've converted, or if the printer counts colour per page.
• Quality: draft for internal reading, normal or high for documents others will see.
• Paper type: matters for photo paper and heavy card; the printer adjusts ink and heat.

Print one page first. A single test sheet catches size, margin and colour problems before they cost you a whole job.

10. For copy shops

When you send a PDF to a copy shop:

• Send one PDF with all pages in order, not a folder of files.
• Name it clearly: your name, the job, the copy count: Rossi-ThesisCopy-3copies.pdf.
• State the paper size, colour, sides and binding in your message, even if it seems obvious.
• Convert to grayscale if you want black-and-white pricing guaranteed.
• Flatten forms so answers print.
• Keep the file reasonably sized but not over-compressed; Light compression is a good compromise.

For professional printing

Brochures, flyers, posters and books printed commercially need extra preparation:

• Bleed: colour or images that run to the edge must extend 3 mm (or 0.125 inch) beyond the trim line, so a slight misalignment when cutting doesn't leave white edges.
• Crop marks: short lines at the corners showing where to cut.
• Safe zone: keep text at least 3 to 5 mm inside the trim line.
• Resolution: 300 DPI for all images at their printed size.
• Colour: many printers want CMYK colours and a specific colour profile; RGB colours can shift when converted.
• PDF/X: some printers require a PDF/X file, a version of PDF built for print production.

These are set up in design software such as InDesign, Affinity Publisher, Scribus or Canva's print export. Browser tools can help with page order, rotation and checking, but the print-ready file should come from the design application with the printer's specification.

A worked example: three copies of a thesis

A student needs three printed, bound copies of a 120-page thesis from a copy shop. The thesis is A4, mostly text, with eight colour charts and some blue hyperlinks in the references.

1. Check page size: A4, matching the shop's paper. No changes needed.
2. Check margins: page numbers sit 8 mm from the bottom edge. The shop's printer leaves 5 mm unprinted, which is close. The student regenerates the PDF from Word with numbers 12 mm from the edge.
3. Decide on colour: the shop charges ten times more per colour page. The charts need colour to be readable, the rest doesn't. The student splits the thesis with Split PDF into the eight chart pages and the rest, converts the rest to grayscale with Grayscale PDF, and merges them back in order with Combine PDF. Now only eight pages print in colour instead of all 120 (the blue links would have turned every reference page into a colour page).
4. Check order and blanks: the approval page, scanned separately and merged in, is sideways. Rotate PDF fixes it.
5. Name and send: Lee-Thesis-3copies-A4-duplex-8colour.pdf, with a short message listing the colour pages, double-sided printing and binding.

The shop prints it without questions, and the bill is a fraction of what an all-colour job would have cost.

A pre-print checklist

1. Page size matches the paper (A4 or Letter), or plan to use Fit.
2. Important content at least 10 mm from every edge.
3. Pages in order, correctly rotated, no unwanted blanks.
4. Page numbers present and not too close to the edge.
5. Converted to grayscale if colour isn't needed.
6. Forms flattened.
7. Not over-compressed; print from the original if you compressed for email.
8. One test page printed and checked.

Common questions

Why does the bottom of my page get cut off? You're probably printing an A4 PDF on US Letter at 100 percent. Choose Fit in the print dialog, or ask for A4 paper.

Why does my black-and-white document count as colour? It contains a small coloured element: a link, a logo, a highlighted word. Convert to grayscale.

Why do my photos print dark? Screens are brighter than paper. Increase brightness in the source image or print a test and adjust.

Should I print from the browser or a PDF reader? Either works. Dedicated readers offer more print options, such as booklet printing and poster tiling.

Can I print a booklet from a normal PDF? Adobe Acrobat Reader and some printer drivers offer booklet printing, which arranges pages so a folded stack reads in order.

Summary

Most printing problems come from a mismatch between the PDF and the paper, content too close to the edge, unintended colour, sideways pages and form fields that don't print. Check page size, keep a 10 mm margin, convert to grayscale when colour isn't needed, fix rotation and order, flatten forms and print one test page. Those few minutes before you press Print save paper, ink and a trip back to the printer.