Sending a PDF to a professional print shop is a different situation from sharing one by email. A file that looks great on screen can produce disappointing printed results if it wasn't prepared with print in mind โ wrong color mode, insufficient resolution, missing bleed, fonts that didn't embed properly. Getting it right isn't complicated, but it does require a few deliberate steps before you hand the file over. This guide covers everything you need to check.
Resolution: Why 300 DPI Is the Standard
Screen resolution and print resolution are measured the same way โ dots per inch โ but the requirements are very different. A screen displays content at 72โ96 DPI, which looks sharp because pixels are small and the viewing distance is typically 50โ60cm. A printer applies ink at a much finer scale, and the output is examined at much closer range. At 72 DPI, printed images look noticeably pixelated. At 300 DPI, they look sharp.
Before exporting your PDF for print, check every image in the document. Images sourced from the web are almost always 72 DPI โ fine for digital use, not for print. Replace them with higher-resolution versions if possible, or accept that those elements will print softer than the rest of the document.
Text and vector graphics (logos, charts, line art created in Illustrator or similar tools) are resolution-independent โ they scale without quality loss regardless of print size. Only raster images (photographs, screenshots) are affected by resolution limits.
Color Mode: RGB vs CMYK
Screens produce color by combining red, green, and blue light (RGB). Commercial printers produce color by layering cyan, magenta, yellow, and black ink (CMYK). The color gamuts overlap but aren't identical โ some bright RGB colors simply can't be reproduced in CMYK ink, and the conversion shifts them toward something duller.
If your PDF was designed in RGB and sent to a print shop without conversion, the printer will convert it automatically โ but the result may not match what you saw on screen. Converting to CMYK yourself, in your design software before exporting, gives you control over how those color shifts happen. You can see the CMYK version and adjust before anything gets printed.
For basic documents โ black and white reports, simple presentations โ color mode rarely matters. For anything where color accuracy is important (brand materials, product photos, event posters), work in CMYK from the start or convert deliberately before export.
Bleed and Safe Margins
What bleed is
When a printer cuts paper to size, the cut isn't perfectly precise โ there's a small margin of error, typically 1โ3mm. If your design has a colored background or image that goes right to the edge of the page, a slightly misaligned cut will leave a thin white border on one or more sides. Bleed is the solution: you extend the background or image 3mm beyond the intended page edge, so a slightly off cut still produces a clean edge-to-edge result.
Bleed is only relevant for designs with full-bleed backgrounds, images that extend to the page edge, or colored borders. For standard documents with white backgrounds and content that stays within the margins, bleed isn't a concern.
Safe margins
The flip side of bleed: keep important content โ text, logos, critical design elements โ at least 5mm inside the intended page edge. This ensures that even with slight cutting variation, nothing essential gets trimmed. Most design software shows a safe zone guide. If yours doesn't, mentally add an inner margin as a buffer when placing content.
Font Embedding
A print shop's computer doesn't have your fonts installed. If your PDF doesn't embed the fonts it uses, the printer's system will substitute the nearest available alternative โ and the result will look wrong. Text that was set in a specific typeface will print in a completely different one.
Always embed all fonts when exporting a print-ready PDF. In most software, this is a setting in the PDF export dialog โ look for "embed all fonts" or "include all fonts" and make sure it's checked. If you're unsure whether your fonts are embedded, open the PDF in Adobe Acrobat, go to File > Properties > Fonts, and confirm that all listed fonts show "Embedded" or "Embedded Subset" next to them.
Export Settings to Use
Most professional print work uses the PDF/X standard โ specifically PDF/X-1a or PDF/X-4. These are standardized PDF profiles designed for print exchange that enforce font embedding, CMYK color, and other print-specific requirements automatically. If your design software offers PDF/X as an export option, use it for print jobs.
If you're exporting from Word or PowerPoint rather than dedicated design software, the print-ready options are more limited. The best approach is:
- Export at the highest quality setting available
- Enable font embedding
- Set image compression to minimal or none
- Check with your print shop whether they have specific requirements โ most will tell you exactly what they need
Before You Send It to the Printer
Run through this checklist before submitting:
- All images are at least 300 DPI at the size they'll be printed
- Color mode matches the print method (CMYK for most commercial printing)
- Bleed is included if the design goes to the edge
- All fonts are embedded
- Page dimensions match the intended print size
- A soft proof (viewing the CMYK version on screen) has been done for color-critical work
If you need to make last-minute edits to a PDF before sending it to print, WukongPDF's PDF Editor at www.wukongpdf.com lets you adjust text and content without going back to the source file โ useful when the original is unavailable or the change is minor enough not to warrant a full re-export.