Most print problems are caused by a small number of common mistakes. Understanding these errors — and how to fix them — can save you significant time and money.
Here are the 5 most common PDF print errors and what you can do about each one.
Error 1: RGB Colours Instead of CMYK
What happens: Colours in the printed output look dull, darker or completely different from the screen version.
Why it happens: RGB is designed for screens. Printing presses use CMYK — a completely different colour system. When an RGB file is printed, the colours are converted automatically, often with inaccurate results.
How to fix it:
- Convert all colours to CMYK in your design software before exporting
- In Illustrator: Edit → Convert to CMYK
- In Photoshop: Image → Mode → CMYK Color
- Or use an automated tool to convert your existing PDF
Error 2: Missing Bleed
What happens: White edges appear around the printed item after cutting.
Why it happens: Cutting machines have a small margin of error. If your design stops exactly at the trim edge, even a slight shift during cutting will expose the white paper underneath.
How to fix it:
- Add 3 mm bleed on all sides in your design software
- Extend all background elements and images into the bleed area
- Re-export your PDF with bleed included
Example: An A4 document (210 × 297 mm) with 3 mm bleed should be exported as 216 × 303 mm.
Error 3: Low Resolution Images
What happens: Images appear blurry or pixelated in the printed output.
Why it happens: Screen images are typically 72–96 DPI — enough for a display, but far too low for print. Print requires at least 300 DPI.
How to fix it:
- Replace low-resolution images with high-resolution versions (300 DPI or higher)
- Never scale up a small image — this does not increase actual resolution
- Use vector graphics (SVG, AI, EPS) where possible — they scale without quality loss
Error 4: Fonts Not Embedded
What happens: Text changes appearance, layout breaks or characters are missing in the printed output.
Why it happens: If fonts are not embedded in the PDF, the printer's system cannot find them and substitutes a different font. This can completely change the layout.
How to fix it:
- Always embed fonts when exporting to PDF (most design tools do this by default)
- In InDesign: check "Embed All Fonts" in PDF export settings
- Convert text to outlines/curves as a fallback (but this prevents text editing)
- PDFs from Microsoft Word often miss fonts — check before sending
Error 5: Wrong PDF Standard
What happens: The print shop rejects the file or requests a different format.
Why it happens: Professional print production requires specific PDF/X standards (PDF/X-1a, PDF/X-3, PDF/X-4). These standards ensure the file is self-contained and correctly prepared for output.
How to fix it:
- Export your PDF in PDF/X-1a or PDF/X-4 format from your design software
- Check with your print shop which standard they require
- Use a conversion tool to set the correct PDF/X standard
How to Check and Fix All Errors at Once
Checking for all five errors manually takes time and requires technical knowledge. An automated preflight tool checks everything in seconds and generates a clear report.
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The five most common PDF print errors are:
- RGB colours instead of CMYK
- Missing bleed
- Low resolution images (below 300 DPI)
- Fonts not embedded
- Wrong PDF standard
Most of these can be detected in seconds with a PDF preflight check. Running a quick check before every print job is the easiest way to avoid rejected files and expensive reprints.