You don't need to be a prepress expert to submit packaging artwork that prints right the first time. A print-ready file has five properties: the manufacturer's dieline on its own non-printing layer, 3 mm of bleed past the cut line, a 3 mm safe area inside it, CMYK color with any Pantone spot colors flagged separately, and outlined fonts with 300 PPI images exported as a print PDF. Miss one and you get clipped text, shifted colors or a rejected file.
Start from the manufacturer's dieline
The dieline is the flat blueprint of your pack: the cut line, the crease or fold lines, and the glue tabs. Every panel of a folding carton or stand-up pouch is laid out flat on it, so artwork placed against the wrong dieline will not line up with the real folds.
Cut, crease and glue tabs
- Cut line — where the blade trims the sheet. Your artwork should extend past this by the bleed amount.
- Crease (score) line — where the board or film folds. Keep critical text and logos away from creases so they don't crack or distort.
- Glue tabs / seal areas — areas that get glued or heat-sealed. Don't place important graphics here; they'll be covered.
Use the dieline the manufacturer sends for your exact structure and size. Redrawing a similar dieline in your own file is the fastest way to introduce a mis-registered panel.
Keep the dieline on its own layer
Put the dieline on a dedicated layer named dieline (or cut/crease), set it to not print, and keep it in a spot color so the printer can toggle it off. If the cut line is merged into your artwork layer, the printer has to separate it manually — and a stray cut line can end up printed on the box.
Bleed and safe area: the two margins that prevent clipping
Blades and dies have a small tolerance on every run. Bleed and safe area absorb that tolerance so your design never shows a white sliver or loses a letter.
Bleed
Bleed is artwork that continues past the cut line, usually 3 mm (about 1/8 in). It is trimmed away after cutting, so any element meant to reach the edge of the panel — a full-bleed photo or a background color — must extend into it.
Safe area
Keep text, logos, barcodes and anything that must not be cut at least 3 mm inside the cut line. This is the safe area, also called the safety margin or live area.
| Zone | Typical amount | What goes there |
|---|---|---|
| Bleed | 3 mm outside the cut line | Backgrounds, photos, colors that run to the edge |
| Safe area | 3 mm inside the cut line | Text, logos, barcodes, key graphics |
| Trim line | 0 (the cut line itself) | Nothing — this is where the blade lands |
Color: build in CMYK, flag Pantone where you need it
This is where the on-screen and on-press versions most often diverge. A design built in RGB can look bright on a monitor and flat or muddy once converted.
Why RGB files shift
RGB is additive light (red, green, blue); CMYK is four process inks (cyan, magenta, yellow, black). Colors outside the CMYK gamut — neon greens, saturated blues, bright oranges — cannot be reproduced exactly by process ink. Build the file in CMYK from the start so what you approve is what prints. Print suppliers' prepress guidelines consistently list "CMYK, not RGB" as a first-pass requirement (Graphic Solutions Group).
Spot vs process color
Most artwork prints with four process plates. A spot color is a single pre-mixed ink — like a Pantone — applied on its own plate, which is how brand colors and metallic or neon inks stay consistent. Adobe's color-separation reference explains the split: printers separate artwork into process plates and, where specified, additional spot plates (Adobe HelpX).
Use spot color only where consistency or a special ink matters: your logo's exact brand blue, or a metallic gold. Flag each spot color with its Pantone number and keep it on a separate swatch so it doesn't get flattened into CMYK by accident.
Confirm Pantone numbers and color approval
If your brand book specifies Pantone numbers, send them with the artwork and expect a color drawdown or proof to approve before production. Screen previews are not a color reference; a physical proof is. Our sampling process walks through how proofing works before you commit.
Images, fonts and file formats
Raster images at 300 PPI
Photographs and other raster images should be 300 PPI at the final printed size. A 72 PPI web image scaled up to a box panel will print soft or pixelated. Logos, icons and line art should be vector (AI, EPS or editable PDF) so they stay sharp at any size.
Outline or embed fonts
Convert type to outlines, or embed the font files, so the printer's system doesn't substitute a default font when it opens your file. Outlining also locks the letterforms, so keep an editable copy for yourself before you do it.
Export a print-ready PDF
Export a press-quality PDF with bleed and crop marks included, in PDF/X-1a or PDF/X-4 format. Keep the dieline on its own layer and spot colors intact. If the printer asks for native files, send the layered AI or EPS alongside the PDF.
Special finishes and barcodes
Foil, spot UV and embossing
Finishes like foil stamping, spot UV, debossing or embossing are applied in a separate pass, so they need their own layer or mask — usually filled with a solid spot color labeled foil, UV or emboss. Leave them out of the CMYK artwork itself.
Barcodes need vectors and contrast
Supply barcodes (EAN, UPC, QR) as vector EPS or a high-resolution file, placed in the safe area, dark ink on a light background, and sized to the standard's minimum. A barcode that sits on a crease or bleeds off the edge may not scan.
Submission checklist
Before you send artwork, confirm each line:
- I'm using the manufacturer's dieline for the exact structure and size
- The dieline is on its own non-printing layer in a spot color
- Backgrounds extend 3 mm into the bleed on every trimmed edge
- Text, logos and barcodes sit at least 3 mm inside the cut line
- The file is built in CMYK; any Pantone spot colors are flagged with their numbers
- Raster images are 300 PPI at final size; logos and icons are vector
- Fonts are outlined or embedded
- Special finishes (foil, UV, emboss) are on separate labeled layers
- Barcodes are vector, in the safe area, with enough contrast
- I exported a print-ready PDF/X with bleed and crop marks
How Foldveil checks artwork before production
You don't have to handle every prepress detail alone. When you request a quote, we confirm the dieline and review your artwork against it before production — checking bleed, safe area, color mode and spot colors, and flagging anything that would shift in print. We also point you to the right printing method for your format and volume, because flexo, digital and offset handle spot colors and color matching differently.