Printing guide
What is bleed in printing?
Bleed is the thin strip of artwork that extends past the final trim line of a printed piece. It exists for one reason: commercial cutters are not accurate enough to consistently land exactly on the edge of your design. Bleed gives them somewhere safe to drift.
The mechanical problem bleed solves
Imagine a business card with a solid blue background. The printer lays down a sheet several times the size of the card, prints many cards on it, then runs the whole sheet through a guillotine to cut each card out. The guillotine's accuracy is roughly ±1 mm on a good day. If your blue background ends precisely at the trim line, any drift in the blade leaves a thin white strip on one edge of every card it cuts that way.
Bleed prevents this. By extending the blue background 3 mm past where the card will be cut, you guarantee that no matter where the blade lands within its tolerance, the blue still reaches the edge.
The 3 mm convention
Across most of Europe, 3 mm is the standard bleed value for cards, flyers and small print jobs. In the US the equivalent is 0.125 inch (3.175 mm). These numbers are not chosen for mathematical beauty — they exist because they are comfortably more than the typical tolerance of a commercial cutter.
For larger pieces (A3+ flyers, posters, packaging) the convention rises to 5 mm or even 6.35 mm. Large-format inkjet cutters and packaging die-cutters often have looser tolerances than small offset guillotines, and the bleed grows to match.
Setting up bleed correctly
The cleanest workflow is to create the document at the export size (trim plus bleed on each side) and place a trim-line guide 3 mm inside each edge. Then:
- Backgrounds, photos and any solid colour extend to the outer edge.
- Text, logos and any element that needs a margin stay inside the safe area, typically 3 mm in from the trim line on the opposite side.
- Trim marks (small corner crosses showing where to cut) are optional in modern PDF workflows but useful if you are printing on a home cutter.
When you can skip bleed
Anything you will not be cutting does not need bleed. That includes office prints on letter-size paper, digital PDFs, and documents printed to fit an existing page format. If a home printer is laying down ink on the inside of a sheet of paper and you are not trimming afterwards, the edges are already the paper edges — no bleed required.
Frequently asked questions
Why is bleed needed at all?
Commercial print cutters are accurate to within about ±1 mm, but they are never perfect. Without bleed, even a half-millimetre of drift exposes the underlying paper as a thin white strip on one edge. Bleed gives the cutter room to drift without affecting the final design.
How much bleed should I add?
3 mm on every side is the European convention. 0.125 inch (3.175 mm) is the equivalent US standard. Large-format posters and packaging sometimes need 5 mm or 6.35 mm — check the printer's spec sheet for anything bigger than a flyer.
What happens if I forget the bleed?
Most professional printers reject files without bleed and ask you to re-export. Some will silently scale your file up to introduce bleed, which makes your safe-area margins too tight and can crop text. Always export with bleed correctly built in.
Do I need bleed for a card with a white background?
Not strictly — but the cost of including bleed in a pure-white design is zero, and it gives you flexibility to add coloured backgrounds later without redesigning.
Does bleed apply to digital documents (PDFs viewed on screen)?
No. Bleed exists for physical cutting tolerance. A PDF that is never printed does not need bleed — the document edges are the screen edges, and there is no cutting involved.