Packaging Guide · 14 min read

How to Prepare Packaging Artwork for Printing: Complete Guide

Learn how to prepare print-ready packaging artwork — file formats, dielines, bleed, CMYK setup, resolution, fonts, and a complete submission checklist. Avoid production delays and ensure first-run print accuracy.

Quick Answer

To prepare packaging artwork for printing, follow these five rules: (1) Use Adobe Illustrator (AI) or press-ready PDF format — never JPEG or PNG. (2) Set your color mode to CMYK, not RGB. (3) Include 3mm bleed on all edges and keep critical content within the safe area. (4) Convert all fonts to outlines before sending. (5) Ensure all images are embedded at 300 DPI minimum. Submit your artwork with the dieline as a separate layer. If you follow these five rules, your artwork will pass pre-press inspection on the first submission. This guide explains each requirement in detail and includes a complete submission checklist you can use before sending files to any packaging manufacturer.

Why Correct Artwork Matters

Incorrect artwork is the number one cause of production delays in custom packaging. At XC Paperbox, approximately 40% of first-time artwork submissions require revision — and every revision adds 1–3 business days to the production timeline. The most common issues are: wrong color mode (RGB instead of CMYK), missing bleed, fonts not converted to outlines, low-resolution images, and text placed outside the safe area. These issues are all preventable. A correctly prepared artwork file moves from submission to pre-press approval in under 24 hours. An incorrectly prepared file bounces back and forth between the client, the designer, and the pre-press team — sometimes for a week or more. This guide is designed to help you get it right the first time. Whether you are a professional designer, a brand owner preparing your own files, or a procurement manager coordinating with a design team, the rules in this guide apply across all packaging types: folding cartons, rigid boxes, corrugated boxes, and paper bags.

Required File Formats (AI / PDF / EPS)

Packaging manufacturers require vector-based files in one of three formats: Adobe Illustrator (.ai), Press-Ready PDF (.pdf), or Encapsulated PostScript (.eps). These are the only formats that preserve vector data, color profiles, and dieline information. Adobe Illustrator (.ai) is the preferred format. It contains editable vector paths, separate layers for dieline and artwork, embedded images, and font outlines. If you work with a designer, ask for the .ai file — it gives the pre-press team the most flexibility to make adjustments. Press-Ready PDF (.pdf) is the second-best option. Export as PDF/X-1a or PDF/X-4 with the following settings: CMYK color mode, 300 DPI images, fonts embedded or outlined, 3mm bleed included, trim marks enabled. PDF/X is a standardized format that ensures the file contains everything needed for print. EPS (.eps) is acceptable for single-element files (logos, icons, spot color elements) but is not recommended for full packaging layouts because it does not support layers or multiple artboards. Formats that are NOT acceptable: JPEG (.jpg), PNG (.png), GIF (.gif), WebP (.webp), Canva exports without PDF/X settings, and screenshots. These formats are raster-based, low-resolution, and do not contain dieline or color profile data. If you submit a JPEG, the pre-press team will reject it immediately. At XC Paperbox, we accept .ai, .pdf, and .eps files. If you are unsure whether your file is print-ready, send it to us for a free pre-press check — we will review it within 24 hours and tell you if anything needs to be fixed.

Vector vs Raster Images

Packaging artwork must use vector graphics for all structural and text elements. Raster images are only acceptable for photographic content. Vector graphics are created with mathematical paths (lines, curves, shapes) that scale infinitely without losing quality. A vector logo at 10mm will print as sharply as the same logo at 10 meters. Vector formats include .ai, .eps, .svg, and .pdf (with preserved vector data). All text, logos, icons, patterns, and structural elements in your packaging artwork must be vector. Raster images are created with pixels — a grid of colored dots. When you enlarge a raster image, the pixels become visible as blur or jagged edges. Raster formats include .jpg, .png, .tiff, and .psd. Raster images are acceptable for photographic content (product photos, lifestyle images, textures) — but only if they meet the resolution requirement (300 DPI at actual print size). A common mistake is placing a 72 DPI web image into packaging artwork. A 72 DPI image that looks fine on screen will print blurry and pixelated. Always check the effective resolution of placed images in Illustrator (Window → Links → check the Effective PPI column). If it is below 300, replace the image with a higher-resolution version. Rule of thumb: logos, text, and graphics = vector. Photos and textures = raster at 300 DPI minimum.

CMYK vs RGB

Always set your packaging artwork to CMYK color mode. RGB is for screens; CMYK is for print. If you submit artwork in RGB, the colors will shift when converted to CMYK — sometimes dramatically. Bright neon greens become muddy olive. Vivid blues become dull purple-blue. Electric oranges become flat brown. The conversion is not something you can fix after printing; it is baked into the file. Set your color mode in Illustrator: File → Document Color Mode → CMYK Color. Do this before you start designing — not after. If you design in RGB and convert at the end, the color shift will surprise you. If your design includes Pantone spot colors, set them as Pantone swatches in the Swatches panel. Do not convert Pantone colors to CMYK unless you are intentionally choosing CMYK-only printing. The pre-press team will handle Pantone separations from the spot color swatches. For CMYK-only printing, use the CMYK color palette. Avoid using RGB colors from the default swatch panel — they will convert unpredictably. If you need to see how your CMYK file will print, use a calibrated monitor and a CMYK proofing profile (ISO Coated v2 or GRACoL 2013). Better yet, request a printed proof from the manufacturer. At XC Paperbox, we provide digital color proofs for every order so you can verify the CMYK output before production begins.

Bleed and Safe Area

Bleed and safe area are the two most important spatial rules in packaging artwork. Bleed is the extra 3mm of artwork that extends beyond the trim line. It ensures that when the box is cut, there is no white edge showing if the cut is slightly off. Without bleed, a 0.5mm cutting tolerance creates a visible white line on the edge of your box. Standard bleed: 3mm on all edges. Some manufacturers require 5mm for large-format boxes — confirm with your account manager. How to set bleed in Illustrator: File → Document Setup → Bleed → 3mm on all four sides. When you export, check "Use Document Bleed Settings" in the PDF export dialog. Safe area is the inner margin where all critical content (text, logos, barcodes) must stay. It is typically 5mm inside the trim line. Anything placed outside the safe area risks being cut off during trimming. How to set safe area: draw a rectangle 5mm inside the dieline on all sides. Keep all text, logos, and important elements inside this rectangle. Common mistake: placing text or a logo flush against the trim line. The cutter has a ±0.5mm tolerance. Text at the edge will be partially cut off. Always keep text at least 5mm from the trim line. For rigid boxes with wrapped edges, the safe area is different — the wrap folds over the grey board edge, so the artwork must extend to cover the fold. Your account manager will provide the specific bleed and safe area requirements for your box type.

Dielines Explained

A dieline is the technical drawing that shows where the packaging will be cut, folded, and glued. It is the blueprint of your box. The dieline is provided by the packaging manufacturer — not created by the designer. The manufacturer engineers the dieline based on your product dimensions, material thickness, and box style. The dieline includes: cut lines (solid lines showing where the board is cut), fold lines (dashed lines showing where the board is folded), glue tabs (areas where adhesive is applied), and bleed areas (extra material beyond the cut line). The designer places the artwork on top of the dieline, ensuring that graphics align with the correct panels and that critical content stays within the safe area. How to work with a dieline: (1) Receive the dieline from the manufacturer as an .ai or .pdf file. (2) Open the dieline in Illustrator. (3) Create a new layer for your artwork. (4) Place the dieline on a separate, locked layer. (5) Design your artwork on the artwork layer, using the dieline as a guide. (6) Before submitting, keep the dieline as a separate layer — do not flatten it into the artwork. (7) Set the dieline to a spot color (commonly named "Dieline" or "CutContour") and set it to overprint. The dieline is a printing instruction, not a printed element. It should never appear in the final print. Common mistakes: placing artwork on the dieline layer instead of a separate layer, hiding the dieline before export (the pre-press team needs it), and designing without confirming the dieline dimensions first. At XC Paperbox, we provide a free dieline template for every box type. Send us your product dimensions, and we will create the dieline and send it to you within 1–2 business days.

Fonts and Outlines

Always convert all text to outlines before submitting packaging artwork. If you do not convert fonts to outlines, the pre-press team may not have your font installed — and your text will default to a system font, ruining your design. Converting to outlines turns text into vector paths, making it independent of font files. How to convert fonts to outlines in Illustrator: Select all text objects → Type → Create Outlines (Ctrl+Shift+O). After converting, the text is no longer editable. Keep a copy of the original file with live text for future edits. What if you cannot outline fonts? Some PDF workflows embed fonts instead of outlining them. If you are exporting a PDF/X-1a or PDF/X-4, you can embed fonts instead of outlining. However, outlining is safer — it guarantees the text will print exactly as designed. At XC Paperbox, we recommend outlining all fonts before submission. If you submit a file with embedded fonts, we will outline them during pre-press, but this adds a step and risks font substitution. Minimum font size: text smaller than 6pt is difficult to print clearly on paperboard, especially on kraft or textured paper. For reverse text (white text on dark background), the minimum is 8pt. For barcodes and regulatory text, follow the specific size requirements provided by your compliance team. Important: after converting to outlines, the text is no longer searchable or selectable. If your file contains legal text that must be machine-readable (e.g., ingredient lists), confirm with the manufacturer whether embedded fonts are acceptable.

Image Resolution (300 DPI)

All raster images in packaging artwork must be 300 DPI at actual print size. DPI (dots per inch) determines how many pixels are printed per inch of paper. 300 DPI is the print industry standard for offset and digital printing. Lower resolutions produce visible pixelation. Higher resolutions above 450 DPI offer no visible improvement and increase file size unnecessarily. How to check image resolution in Illustrator: Window → Links → select the image → check the Effective PPI column. If Effective PPI is below 300, the image is too small at its current placement size. You have two options: replace the image with a higher-resolution version, or reduce the image size on the page (which increases the effective PPI). Common scenario: a 1000×1000 pixel image placed at 100×100mm. The effective PPI is 254 — below the 300 minimum. Solution: reduce the image to 84×84mm, which increases the effective PPI to 300. Or, use a 1200×1200 pixel version of the image. Scaling up a low-resolution image does not improve quality — it just spreads the same pixels over a larger area. If you need a larger image, you need the original high-resolution source file. Stock photo sites typically provide images at 300 DPI for print use. Images downloaded from websites, social media, or screenshots are almost always 72 DPI and unsuitable for print. At XC Paperbox, we check the effective resolution of every placed image during pre-press. If an image is below 300 DPI, we will flag it and ask for a replacement. This is one of the most common reasons for artwork revision.

Barcode & QR Code Placement

Barcodes and QR codes require special placement rules to ensure they scan correctly. Incorrectly placed barcodes are a common source of artwork rejection — and they cannot be fixed after printing. Barcode placement rules: Place barcodes on a flat, uncreased panel — never on a fold line or curved surface. The barcode must be printed on a white or light-colored background. Do not place barcodes over dark colors, gradients, or images — the contrast between bars and background must be high for scanners to read. Keep barcodes at least 5mm from the trim line and fold lines. The barcode should be oriented horizontally (bars running left to right) unless the box design requires vertical orientation. QR code placement rules: QR codes need a quiet zone — a white border of at least 4 modules (the small squares that make up the QR code) on all sides. The minimum printed size for a QR code is 20×20mm. Smaller QR codes may not scan reliably on paperboard. Test your QR code by printing it on paper at actual size and scanning it with multiple phones before submitting the artwork. Common mistakes: placing the barcode over a colored background (reduces contrast), placing the barcode on a fold line (creases disrupt scanning), scaling the barcode below the minimum size (scanner cannot read it), and using a low-resolution barcode image (bars become blurry). Barcodes should be vector graphics (EPS or AI format), not raster images. If your barcode is a placed image, ensure it is at 1200 DPI minimum — barcode scanners are more sensitive to resolution than the human eye. At XC Paperbox, we verify barcode readability during pre-press using a barcode verifier. If your barcode does not pass, we will notify you before printing.

Common Artwork Mistakes

Based on thousands of artwork submissions at XC Paperbox, these are the most common mistakes that cause artwork rejection. Mistake 1: Submitting RGB files. RGB colors shift unpredictably when converted to CMYK. Always design in CMYK from the start. Mistake 2: Missing bleed. Without 3mm bleed, the cut edge may show white paper. Always extend background colors and images beyond the trim line. Mistake 3: Text too close to the edge. The cutter has ±0.5mm tolerance. Text within 5mm of the trim line risks being cut off. Keep all text in the safe area. Mistake 4: Fonts not outlined. If the pre-press team does not have your font, the text will substitute to a default font. Always outline fonts before submission. Mistake 5: Low-resolution images. 72 DPI web images print blurry. Every image must be 300 DPI at actual print size. Mistake 6: Dieline flattened into artwork. The dieline must be on a separate layer so the pre-press team can remove it before printing. Flattened dielines print as visible lines on the box. Mistake 7: Incorrect dimensions. The artwork dimensions must match the dieline exactly. A 1mm mismatch means the graphics will not align with the panels. Always start with the manufacturer-provided dieline — never estimate dimensions. Mistake 8: Barcode on a colored background. Scanners need high contrast. Always place barcodes on a white or very light background. Mistake 9: Forgetting to embed images. Linked images appear as empty boxes if the pre-press team cannot access the linked files. Embed all images or package the file (File → Package in Illustrator). Mistake 10: Submitting the wrong file version. Always label your final file clearly: "BrandName_BoxType_FINAL_YYYYMMDD.ai". Do not send multiple versions without clear labeling.

Artwork Submission Checklist

Use this checklist before submitting artwork to any packaging manufacturer. Tick each item to confirm it is correct. File format: .ai (preferred), PDF/X-1a or PDF/X-4 (acceptable), .eps (acceptable for single elements). Color mode: CMYK (not RGB). Pantone colors specified as spot color swatches (if applicable). Bleed: 3mm on all edges. Background colors and images extend to the bleed line. Safe area: all text, logos, and critical elements at least 5mm from the trim line. Dieline: on a separate layer, set to overprint, named "Dieline" or "CutContour". Artwork on a separate layer from the dieline. Fonts: all text converted to outlines (Ctrl+Shift+O). Image resolution: every placed image at 300 DPI effective PPI at actual size. Images: embedded (not linked) or the file packaged (File → Package). Barcodes and QR codes: on a white background, at least 5mm from trim and fold lines, minimum size per specification. Dimensions: artwork matches the manufacturer-provided dieline exactly. File name: clear and descriptive (BrandName_Product_Date.ai). Version: final version only — do not send multiple versions. This checklist is available as a printable PDF from XC Paperbox. Request it from your account manager when you place your order. If you check every item on this list, your artwork will pass pre-press inspection on the first submission. If you are unsure about any item, send us your file for a free pre-press check — we review every file within 24 hours and tell you exactly what needs to be fixed.

FAQ

Below are the most common questions about preparing packaging artwork for printing. If you have a question not covered here, contact us through our inquiry form.

Conclusion

Preparing packaging artwork for printing is a technical process, but it is governed by a small set of clear rules: CMYK, 300 DPI, 3mm bleed, outlined fonts, a separate dieline layer, and a labeled final file. Follow these rules, and your artwork will pass pre-press inspection on the first submission. Skip any of them, and your production timeline will be delayed by days — sometimes weeks. The most common mistake is not the rules themselves — it is assuming that someone else will catch the errors. Pre-press teams do check files, but they cannot fix fundamental issues like missing bleed or low-resolution images without asking you to resubmit. Every resubmission costs time. At XC Paperbox, we provide a free dieline template, a free pre-press artwork check within 24 hours, and a free digital color proof for every order. Use the checklist in this guide before submitting your files. If you are unsure about any requirement, send us your artwork and we will review it. Request a free quote or order samples to get started.

Frequently asked

Adobe Illustrator (.ai) is the preferred format for packaging artwork.

Illustrator (.ai) files contain editable vector paths, separate layers for dieline and artwork, embedded images, and font outlines — everything the pre-press team needs. Press-ready PDF (PDF/X-1a or PDF/X-4) is the second-best option. EPS is acceptable for single-element files but not recommended for full packaging layouts. JPEG, PNG, and other raster formats are not acceptable for packaging artwork because they are low-resolution, do not support vector data, and cannot contain dieline information.

Always CMYK. RGB is for screens; CMYK is for print.

Packaging is printed with CMYK inks (Cyan, Magenta, Yellow, Black). If you submit artwork in RGB, the colors will shift when converted — sometimes dramatically. Bright greens become muddy, vivid blues become dull, and electric oranges become flat. Set your document color mode to CMYK in Illustrator (File → Document Color Mode → CMYK Color) before you start designing. If your design includes Pantone spot colors, specify them as Pantone swatches in the Swatches panel — do not convert them to CMYK unless you are intentionally choosing CMYK-only printing.

A dieline is the technical drawing that shows where the packaging will be cut, folded, and glued.

The dieline is the blueprint of your box. It includes: cut lines (solid lines showing where the board is cut), fold lines (dashed lines showing where the board is folded), glue tabs (areas where adhesive is applied), and bleed areas. The manufacturer creates the dieline based on your product dimensions. The designer places artwork on top of the dieline as a guide. The dieline must be on a separate layer, set to a spot color and overprint, so it does not appear in the final print. At XC Paperbox, we provide free dieline templates for every box type within 1–2 business days.

3mm bleed on all edges is the industry standard.

Bleed is the extra 3mm of artwork that extends beyond the trim line. It ensures that when the box is cut, there is no white edge showing if the cut is slightly off (cutting tolerance is ±0.5mm). Set bleed in Illustrator: File → Document Setup → Bleed → 3mm on all four sides. When exporting PDF, check "Use Document Bleed Settings". Some large-format boxes require 5mm bleed — confirm with your manufacturer. The safe area (where all critical content must stay) is 5mm inside the trim line.

300 DPI at actual print size for all raster images.

300 DPI is the print industry standard for offset and digital printing. Lower resolutions produce visible pixelation; higher resolutions above 450 DPI offer no visible improvement. Check effective resolution in Illustrator: Window → Links → check the Effective PPI column. If it is below 300, replace the image with a higher-resolution version or reduce the image size on the page. Logos, text, and graphics should be vector (not raster) — they scale infinitely without quality loss. Photos and textures should be 300 DPI raster images.

Yes — XC Paperbox provides a free pre-press artwork check within 24 hours.

Send us your artwork file (.ai or .pdf) and we will review it for: color mode (CMYK vs RGB), bleed and safe area, font outlines, image resolution (300 DPI), dieline separation, barcode placement, and dimensional accuracy. We will send you a report within 24 hours detailing any issues found and exactly how to fix them. If the file is correct, we will send it directly to pre-press for proofing. This service is free for all orders. If you do not have a designer, we can also prepare the artwork for you — ask for a design service quote when you submit your inquiry.

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