Print-ready files, explained without the jargon
Few things stall a print job like a printer emailing back “file not print-ready”. The fixes are simple once you know what they're checking for — and a designer should hand you files that pass the first time.
Bleed and the safe zone
Printers don't print to the exact edge of your flyer. They print on a larger sheet and trim it down, and the blade can wander slightly. Bleed is extra artwork that runs past the trim line so that, if the cut drifts, you still see colour instead of a thin white sliver. In North America the usual bleed is 0.125 inch; in Europe it's typically 3 mm.
The safe zone is the opposite margin, inside the trim line. Keep text, logos and anything important inside it so nothing gets clipped. A good file has both: background images that run into the bleed, and type that sits well inside the safe area.
CMYK, RGB and spot colours
Screens mix colour from red, green and blue light (RGB). Printing presses mix it from cyan, magenta, yellow and black ink (CMYK). Some bright screen colours — vivid greens, electric blues, neon pinks — simply can't be reproduced with four inks, so a file sent in RGB often prints duller than expected.
When a colour has to match exactly every time — a logo on packaging, say — designers use a spot colour such as a Pantone ink, mixed to a recipe. It costs more per job but stays consistent between print runs and between printers.
Resolution, fonts and the PDF your printer wants
Photos should be around 300 pixels per inch at the size they'll be printed. An image pulled from a website usually looks sharp on screen and soft on paper, because it was made for 72–150 pixels per inch. Logos and illustrations should be vector, so they stay crisp at any size.
Fonts need to be embedded or converted to outlines, otherwise the printer's computer swaps in a default and your layout breaks. Most print shops ask for a press-quality PDF — often PDF/X-1a or PDF/X-4 — which locks all of this into one file they can trust.
A two-minute checklist before you send
Is the document the exact finished size, with bleed added on every side? Is all text inside the safe zone? Are colours CMYK or named spot colours? Are photos sharp at 100% zoom? Are fonts embedded or outlined? Is the file a PDF your printer asked for?
If you're not sure, ask the printer for their spec sheet before design starts. Two lines of email at the beginning save a week at the end.
A print-ready file is one your printer can send straight to press without calling you first.
Takeaway
Bleed outside, safe zone inside, CMYK or spot colour, 300 ppi photos, embedded fonts, one press PDF. Ask for the printer's spec sheet on day one.
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