Missing bleed is one of the most common reasons a print file gets rejected. Without it, tiny shifts during cutting can leave thin white lines at the edge of your design. Here's what bleed is, why it matters, and how to add it automatically.
What Is Bleed?
Bleed is extra content that extends 2–3mm beyond the trim edge of your design. Because cutting machines aren't perfectly precise, this margin ensures that background colours and images reach all the way to the edge even after a slight shift, with no white gaps.
How to Tell If Your PDF Has Bleed
Check your PDF's page boxes: the TrimBox defines the final cut size, and the BleedBox should be 2–3mm larger on each side. If BleedBox and TrimBox are the same size, your file has no bleed.
Adding Bleed Automatically
For designs with simple, solid-colour or repeating backgrounds, bleed can be added automatically by extending the existing edge content outward. PrintFix247 detects the edge colour or pattern and extends it to fill the required bleed area.
When Automatic Bleed Doesn't Work
Complex photographic content — a face or object positioned right at the trim edge — can't be extended reliably without guessing what should be there. In these cases, the only reliable fix is going back to the original design file and re-exporting with bleed included.
How to Set Up Bleed Correctly in Design Software
- InDesign — File → Document Setup → set Bleed to 3mm on all sides before exporting
- Illustrator — File → Document Setup → Bleed, or set it during PDF export
- Affinity Publisher — set Bleed in Document Setup before starting the design
Setting bleed correctly from the start avoids the problem entirely.
Add bleed to your PDF automatically
Upload your file and PrintFix247 extends the edges to add proper bleed in seconds.
Fix PDF now →Verify Before Printing
After adding bleed, check the result with PrintReady247 to confirm the BleedBox is correctly set before sending the file to print.