Label Printing File Preparation: 5 Steps + 7 Common Mistakes

Last week, a client building an emerging brand asked me: "The printer says there's a problem with the label file I designed."

I said: "5-Step Prepress File Workflow—you might have missed a step."

He asked, "What 5 steps?"

I said: "Design draft / Bleed / Outline fonts / Color mode / File format—each step has common pitfalls. This article doesn't cover 'file format'—it walks you through the 5-step preparation workflow + 7 common pitfalls + a printer acceptance checklist, so your file goes to press with zero revisions."

5-Step Pre-Press Preparation Process

Step 1: Design File

3 Design Tools:

• CorelDRAW (CDR) — mainstream for printers, vector design
• Adobe Illustrator (AI) — mainstream for designers, vector design
• Photoshop (PSD) — bitmap design, used only for photo-style labels

3 Design Requirements:

• Vector files (CDR / AI) preferred
• Resolution ≥ 300 DPI (bitmap)
• Color mode CMYK (not RGB)

Step 2: Bleed Area 3mm

Definition:

• Bleed = extra area of the design extending beyond the finished size
• Industry standard: 3mm

Why a Bleed is Needed:

• Printing cutting tolerance ±1mm
• Die-cutting tolerance ±0.1mm
• Bleed ensures no white edges appear after cutting

3 Common Mistakes:

• No bleed set (edges misaligned)
• Bleed less than 3mm (white edges show)
• Bleed too large (image shrinks)

Setup Method (using CorelDRAW as an example):

1. Document Settings → Bleed → 3mm
2. Extend the design outward by 3mm
3. Extend the design background color into the bleed area

Step 3: Convert Text to Curves

Why Outlines are Needed:

• If the printer lacks your font, it will auto-substitute (ruining the design)
• Font licensing (commercial fonts require a license purchase)
• Cross-platform compatibility (fonts render differently on different systems)

3 Common Mistakes:

• Not converting to outlines (printer errors)
• Partially converting to outlines (some text disappears)
• Saving as PDF after converting to outlines (cannot be edited)

How to Do It (CorelDRAW):

1. Select All (Ctrl + A)
2. Text → Convert to Curves (Ctrl + Q)
3. Save as .cdr or .ai

How to Do It (AI):

1. Select All (Ctrl + A)
2. Type → Create Outlines (Ctrl + Shift + O)
3. Save as .ai

Step 4: CMYK Color Mode

3 Color Modes:

• RGB — screen light (TV / monitor)
• CMYK — printing ink (labels / packaging)
• PANTONE — spot color (specific color number)

Labels Must Use CMYK:

• CMYK is the printing standard
• Converting RGB to CMYK causes color loss
• PANTONE spot colors must be specified separately

3 Common Mistakes:

• File is in RGB mode (printer error)
• Colors darken by 20% after converting RGB to CMYK
• PANTONE spot color not specified

How to Do It (CorelDRAW):

1. Document Settings → Color Mode → CMYK
2. Use CMYK colors on all layers
3. Specify the color number for PANTONE spot colors (e.g., PANTONE 185 C)

Step 5: File Format

3 File Formats:

3 Recommendations:

• Provide both PDF (universal) + AI (editable)
• PDF with outlines + embedded fonts
• Clear file naming (product + SKU + date)

Summary of 7 Common Mistakes

Mistake 1: Bleed Area Not Set

Symptom: Crooked edges / white borders showing

Solution: 3mm bleed area is mandatory

Mistake 2: Fonts Not Converted to Outlines

Symptom: Print shop reports an error / font substitution

Solution: Convert to outlines + back up the original file

Mistake 3: RGB Color Mode

Symptom: Color shift in printing

Solution: CMYK mode + PANTONE

Mistake 4: Insufficient Resolution

Symptom: Blurry printing

Solution: ≥ 300 DPI

Mistake 5: Wrong Image Format

Symptom: Images out of position

Solution: Embed images (do not link)

Mistake 6: Colors Exceed CMYK Gamut

Symptom: Colors turn gray after printing

Solution: Use PANTONE spot colors + check the gamut

Mistake 7: Non-Standard File Naming

Symptom: Print shop confusion

Solution: Product name + SKU + date + size

Printer 5-Step Inspection Checklist

Inspection 1: Dimensions

Check:

• Label size + bleed
• Caliper measurement ±0.1mm
• Die-cut position

Inspection 2: Fonts

Check:

• All fonts converted to outlines
• Text content is correct
• Font size ≥ 6pt

Inspection 3: Color

Check:

• CMYK mode
• PANTONE spot color matching
• Color gamut check

Inspection 4: Images

Check:

• Resolution ≥ 300 DPI
• Embedded images
• Correct color mode

Inspection 5: Files

Check:

• PDF universal version
• AI source file
• Clear file naming

4 Types of Files Delivered to the Printing Factory

To learn about post-press processes—refer to the 3 label post-press processes, or directly contact a LeXiang Packaging consultant, and you will receive a pre-press checklist + acceptance tools within 24 hours.