Crop, registration and bleed marks explained
Open a print-ready PDF and you'll see a frame of thin lines, targets and colour patches around the artwork. They look decorative but each is an instruction — to the guillotine, to the press operator, to quality control. Here's what every mark does and how to output them correctly.
Crop marks (trim marks)
Crop marks are short lines at each corner showing where to cut. They sit just outside the trim, offset slightly so they don't print into the artwork, and they're the cutter's guide to the finished size. They're the one mark almost every job needs.
Bleed marks
Bleed marks (a second set of corner lines further out) indicate the bleed boundary — how far your background extends past the trim. They tell production that the over-edge colour is intentional, not a mistake. If you're unsure how much background to carry past the cut, see our guide to bleed.
Registration marks
Registration marks are the small crosshair-in-a-circle targets, usually centred on each side. They print in all ink colours at once (100% of every plate). When the press is in register, every colour's mark lands exactly on top of the others; if a plate drifts, the operator sees it instantly in the target and corrects it. They're how four separate ink layers are kept aligned.
Why marks use 'registration' colour
Registration black is 100% of every plate (400% ink) so the mark appears on all separations. That's perfect for marks — and disastrous inside artwork, where it floods ink. Never set body text or fills to registration colour.
Colour bars and the rest
Around the edge you'll often also find:
- Colour control bars — patches of solid and tint ink the operator measures to keep density and dot gain consistent across the run.
- Star targets / slur marks — reveal smearing, doubling or directional ink problems.
- Page information — file name, date, separation name, printed in the slug area for tracking.
On a finished piece you never see any of this — it all lives in the trimmed-off margin. Heavy solid bars also feed into ink-density checks; if you're watching total coverage, our TAC checker covers the limits.
Exporting marks correctly
In InDesign or Illustrator, turn on Crop Marks and Bleed Marks in the PDF export Marks & Bleeds panel, set the offset so marks clear the bleed, and include the document bleed. Don't draw marks by hand inside the artwork — let the export add them in the correct place, in registration colour, outside the trim.
If you're not in a full layout app, the Bleed & Dieline Generator outputs a print-ready file with crop marks, registration targets, a colour bar and a safe-area guide already positioned correctly for your trim size.
Frequently asked questions
What's the difference between crop marks and bleed marks?
Crop marks show where to cut (the trim line). Bleed marks sit further out and show how far the bleed extends. Crop marks define the finished size; bleed marks confirm the over-edge area is intentional.
What are registration marks for?
They're crosshair targets printed in all ink colours so the press operator can confirm every colour aligns. If a plate is out of register, its mark shifts off the others, signalling a correction is needed.
Should I add printer's marks myself?
Let your layout app add them on export rather than drawing them in the artwork. Manual marks often sit in the wrong place or the wrong colour. Enable crop and bleed marks with a proper offset in the PDF export settings.
What is registration colour and when should I use it?
Registration colour is 100% of every plate, used only for marks so they appear on all separations. Never use it for artwork or text — it lays down far too much ink and won't dry.
The marks you never see
Every one of these marks does a job, then gets trimmed off and thrown away. That's the point — they're instructions for the machines, not decoration for you. Reviewed June 14, 2026.