The pattern this guide solves

Roughly 60% of the artwork files we receive from new brands require at least one round of pre-press correction before we can plate. The fixes are almost always the same handful of issues — missing bleed, wrong color space, un-outlined fonts, dieline on the wrong layer, no Pantone spec for brand colors. Each issue adds 1–3 days to lead time and, in a few cases, a re-plate cost.

This isn’t a designer’s failure — it’s an industry failure to write down the production-side rules in a place where designers can find them. Most food packaging design education focuses on aesthetics; the production-quality fundamentals show up in trade publications and converter QA training, not in design schools.

This guide is the version I wish more designers had read before sending their first production-ready file.

1. File format, color space, and the boring foundations

Vector, always. PDF or AI.

Production-ready artwork must be vector — not a high-resolution raster image. Flexo and gravure plates are imaged from vector paths; raster images get rasterized at the plate stage with quality and resolution decisions out of the designer’s control.

Send us either:

  • Adobe Illustrator (AI) native file with all assets embedded
  • Print-ready PDF (PDF/X-1a or PDF/X-4 preset)

We will accept Photoshop (PSD) for raster elements that need to be embedded inside a vector layout (e.g., a photographic background under vector type), but the overall layout file must be vector.

CMYK + spot colors, not RGB

Production printing uses CMYK process inks plus optional dedicated Pantone spot inks. RGB color spaces (sRGB, Adobe RGB, Display P3) don’t translate directly — files exported in RGB get auto-converted to CMYK at our pre-press stage, often with significant color shift.

Convert to CMYK in Illustrator (Edit → Convert to Profile → CMYK) before sending. For Pantone colors, use Pantone Solid Coated swatches; don’t simulate them from CMYK.

Color profile: GRACoL 2013 or ISO Coated v2

The two industry-standard CMYK color profiles for packaging are:

  • GRACoL 2013 — North American standard for commercial print
  • ISO Coated v2 — European/international standard

Use whichever your design software defaults to and we’ll align on our side. Mismatched profiles between design file and proof file is one of the more common subtle color-match issues — clarify with your converter at the quote stage.

300+ dpi for raster elements

Any raster image embedded in your layout (food photography, brand textures) must be at least 300 dpi at final printed size. Resolution lower than 300 dpi shows soft edges on print. Higher than 300 dpi is wasted bandwidth — most printing processes can’t reproduce more detail than 300 dpi at human viewing distance.

2. Dieline, bleed, and trim — the mechanical fundamentals

What the dieline is

The dieline is the technical drawing of your packaging’s cut, fold, glue, and seal areas. It’s the engineering specification of how the flat printed sheet becomes a finished pouch or carton. For pouches, it shows seal lines, gusset folds, valve locations, zipper placement. For cartons, it shows panel boundaries, glue tabs, cut edges, fold scores.

The dieline is provided by your converter for any new project. If you’re designing for a stock dieline (standard pouch size, standard carton template), we send the dieline file at quote stage. If you’re designing for a custom dieline, we co-develop it during pre-press.

Where the dieline goes in your file

Place the dieline on its own named layer above your design layers. Mark the dieline layer non-printing (Print → Off in Illustrator) but visible. Standard layer names:

  • DIELINE — the cut, fold, score lines
  • BLEED — the bleed extension area (usually 5mm beyond the dieline)
  • SAFE — the safe area for critical content (5mm inset from the dieline)
  • ART — your actual design

Do not collapse these layers before submitting. We need them separated to extract the dieline for plate-making.

Bleed: 5mm everywhere

Every design element that extends to the edge of the printed area must extend 5mm past the dieline (the “bleed” area). This compensates for slight registration variation during printing and trimming — without bleed, you can end up with thin white slivers along the trimmed edge.

Common mistake: designing the background to end exactly at the dieline edge. Even with perfect registration, post-cut handling can show a 0.3–0.5mm trim line where the background appears to retract from the edge. Always extend backgrounds, photography, and gradient fills to the full bleed area.

Safe area: 5mm inset

Conversely, all critical content (logos, key text, barcodes, regulatory information) should sit at least 5mm inside the dieline to ensure it’s never trimmed off. This is the safe area.

A simple visualization:

[ Bleed area — 5mm extension past trim ]
    [ DIELINE — actual cut/fold line ]
        [ Safe area — 5mm inset from trim ]
            [ Critical content lives here ]

3. Color management — the hardest pre-press topic

Why CMYK can’t match every color

The CMYK process gamut (the range of colors achievable by combining cyan, magenta, yellow, black inks) covers roughly 50–60% of the Pantone Solid Coated library. Vivid blues, deep oranges, pure greens, neon pinks — all fall outside CMYK gamut. When you simulate these in CMYK, they print muted, shifted, and inconsistent.

What you can do:

  • Specify these colors as dedicated Pantone spot inks. A separate ink station on the printing press lays down the exact Pantone color, no simulation needed.
  • Accept the CMYK simulation with the visual understanding that it won’t match the Pantone reference. Sometimes acceptable for non-brand elements.
  • Use extended-gamut digital printing (HP Indigo with 7-color extended-gamut covers ~95% of Pantone Solid Coated). Limited to digital print’s MOQ ranges.

Brand colors should always be specified as Pantone spot inks for production runs. The cost difference (one additional ink station) is small compared to the brand consistency value.

Metallic Pantones

Pantone metallic gold, silver, copper, rose-gold, holographic — these contain real metal-pigment flakes that require dedicated metallic-pigment inks. CMYK cannot simulate these convincingly. Specify metallics as spot Pantones; on gravure they print with full reflective brilliance, on flexo they print well but slightly dulled, on digital they cannot print at all.

For premium gift packaging with gold or silver brand marks, plan for hot-foil stamping as a separate finishing pass instead of (or in addition to) metallic ink — see our foil stamping guide for details.

Soft-touch and matte laminate effects on color

Finishing affects perceived color. Soft-touch laminate (the velvety matte coating popular on premium chocolate boxes) dulls color saturation by roughly 10–15% — what looks vibrant on a glossy proof appears more muted on the finished pack. Spot UV concentrates light and makes adjacent areas appear less saturated by contrast.

Design with the finish in mind. For soft-touch packaging where colors need to remain vivid, bump saturation by 10–15% in the layout file. For spot UV designs, ensure non-UV areas have enough saturation to read in the finished piece.

ΔE tolerance — what’s actually achievable

For Pantone-matched spot ink colors, our standard color tolerance is ΔE < 2.0 vs the physical Pantone reference. This is the established industry benchmark — most buyers can’t see a ΔE < 2.0 difference; almost everyone can see a ΔE > 4.0 difference.

If your brand colors require tighter tolerance (luxury chocolate, premium coffee with central brand standards), specify at quote stage. ΔE < 1.5 is achievable on gravure with calibrated ink mixing but adds production cost and reduces throughput.

4. Typography — the silent failure mode

Outline all fonts

The single most common pre-press fail: submitted artwork contains live (un-outlined) type, and we don’t have the licensed font installed on our pre-press systems. Result: type renders in a default substitute (usually Helvetica), looks wrong, and requires going back to the designer for a fix.

Always outline fonts to curves before sending production files:

In Illustrator: Select All → Type → Create Outlines. In InDesign: File → Package, then in the output Type → Create Outlines on the selected text frames.

After outlining, you can’t edit the text content — outline only after final approval. We recommend keeping an editable master file separately for future revisions, and outlining a copy for production.

Minimum text size

For flexo and gravure print on flexible substrates, the practical minimum text sizes:

  • Positive type (dark on light): 4 pt minimum readable, 6 pt comfortable
  • Reverse type (light on dark): 6 pt minimum readable, 8 pt comfortable
  • Critical legal/regulatory text (ingredient lists, allergen warnings, nutrition panels): 7 pt minimum per most food labeling regulations

Below these sizes, ink dot-gain and slight registration variation make text fuzzy or illegible. Resist the urge to make the ingredient panel smaller than 7 pt to fit it on a smaller package.

Font weights and registration

Thin (Hairline, Thin, Light) font weights below 6 pt can disappear under flexo dot-gain. If you’re using fine-weight sans-serif typography for elegance, ensure point sizes are large enough for ink coverage to register cleanly. Test on a press proof if you’re not sure.

5. Barcode and FNSKU placement (the FBA-specific part)

For Amazon FBA-bound packaging, barcode placement follows specific rules:

FNSKU barcode requirements

  • Minimum size: 30mm wide × 15mm tall printed dimension. Scanning beneath this becomes unreliable.
  • Flat surface required. Place on a flat, printable area. Never on a curved surface, never inside a window, never on a seal flap.
  • Adequate contrast. Black bars on white background is the safe choice. Reverse barcodes (white on black) sometimes scan but unreliably.
  • Quiet zone: Maintain at least 5mm clear space around the barcode — no other graphics in this zone.
  • Orientation: Bars vertical (parallel to the long axis of the barcode) for optimal scanning.
  • Don’t cover with finishing. Spot UV, foil-stamp, or soft-touch over the barcode area can interfere with scanning. Mask these areas during finishing.

UPC / EAN barcode placement

For retail-shelf SKUs requiring scannable UPC or EAN barcodes:

  • Standard size: 100% magnification (37.3mm wide for UPC-A) gives most reliable scan. Down to 80% magnification works; below that is risky.
  • Back of package or bottom of carton are conventional placements. Front-of-pack is acceptable but unusual.

We can FNSKU pre-sticker for FBA at our QC stage — see our low-MOQ packaging guide for details.

6. The substrate-specific design considerations

Kraft paper

The natural kraft brown background shifts the apparent color of any ink printed on top. White ink looks cream; bright colors appear more muted; deep colors look richer. Design with a kraft swatch in your color-picker if your converter doesn’t auto-generate kraft-corrected proofs.

Fine detail prints less crisply on kraft than on coated film. Avoid hairline strokes; bump weight on small text; consider using larger headline type to compensate for slightly fuzzier mid-tone reproduction.

Soft-touch / matte laminate

Adds tactile premium signal but dulls color saturation by 10–15% — design accordingly. Combine with spot UV on key elements (logos, hero imagery) to create contrast between matte field and gloss accent.

Foil substrate (chocolate bar wraps)

When designing for foil substrate (the bar foil wrap goes around the chocolate inside a separate paper wrap), remember:

  • Foil’s natural silver shows through any uncoated area
  • Print colors look more vibrant than on white substrate (foil reflects through transparent inks)
  • Inside-print (on the surface facing the chocolate) is invisible from outside but adds production cost — only use if there’s a specific reason

Window panels

If your carton has a die-cut window with PET film insert, design the surrounding artwork to frame the window cleanly. The PET window adds 250µm thickness — finishing edges in the window area may show subtle level differences from the surrounding board.

7. The pre-flight checklist

Before sending production-ready artwork, verify:

  • File format: AI or print-ready PDF (PDF/X-1a or PDF/X-4)
  • Color space: CMYK + named Pantone spots for brand colors
  • Resolution: 300 dpi for any raster elements at final size
  • Bleed: 5mm extension past dieline on all bleed areas
  • Safe area: critical content 5mm inside the dieline
  • Dieline: on a separate named layer, non-printing
  • Fonts: all outlined to curves
  • Pantone colors: specified by PMS number, not CMYK simulation
  • Barcode: 30mm × 15mm minimum, on flat printable area
  • Regulatory text: minimum 7 pt readable size
  • File package: linked images embedded or supplied
  • Document size: matches final flat sheet dimensions

For new designers: ask your converter for a sample pre-press-approved file from a similar project. Seeing how a verified production file is structured is the fastest learning route.

8. Common revisions we make to first-time files

Patterns we see most often in incoming production files:

Missing bleed. Background ends at the dieline. We extend bleed manually and confirm with you before plating. Adds 1 day.

Live type instead of outlined. Type substitutes to default font; visual mismatch. We send back to designer for outlining. Adds 1–2 days.

Wrong color space (RGB instead of CMYK). Auto-converted with visible color shift on key elements. We flag issues, request corrected files. Adds 1–3 days.

Dieline embedded in background. The dieline lines are merged into the design layer instead of separated. We have to manually trace and rebuild. Adds 1 day.

Pantone color named in CMYK build only. No actual spot ink reference. We approximate from CMYK, often with visible mismatch from brand standard. Critical to specify Pantone PMS numbers explicitly.

Photographic image at 72 dpi. Designer pulled a web image; prints fuzzy. We request high-res replacement.

Logo too small. Specified at 8mm tall; reads unclearly after registration variation. We recommend minimum 15mm for visibility.

Barcode in a window. FBA barcode placed inside a PET window where scanning fails. We recommend repositioning to flat printable area.

For new clients, our standard process includes a free first-pre-press review where we flag these issues and recommend fixes before quoting a final print run. Use this; it’s faster than getting plates made and discovering the issue at first proof.

9. The pre-press partnership

Pre-press isn’t a black box — for good projects, it’s a collaboration between brand designer and converter pre-press team:

  • First-pass review: Designer submits production file; converter pre-press team reviews and flags issues (typically 24h).
  • Soft proof / hard proof: Converter generates color-calibrated proof. Designer signs off or requests corrections.
  • Press proof / production proof: Plates made; first 200m of web printed and color-matched against the signed proof. Designer or brand manager signs off on press conditions.
  • Production run: Press runs at production speed; samples pulled hourly for color verification.
  • Sign-off retain: Final approved sample retained for 24 months as the reference for any future reorder.

For new brands, our pre-press team typically allocates 2–3 hours of consultation per first project — walking through the file, explaining production constraints, recommending adjustments. This is part of standard quote-included service, not a paid add-on.

10. Further reading

For specific color and print-process trade-offs, see:

For substrate-specific design considerations beyond what’s covered here, see our material deep-dives: BOPP, PET, aluminum foil, kraft paper.

For compliance and regulatory artwork requirements (FDA, EU 10/2011, country-of-origin marking), see our food packaging regulations guide.

When you’re ready to submit production artwork, the RFQ form accepts AI/PDF up to 50MB; we’ll review and confirm pre-press readiness within 24 hours of submission.