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C4

C Series

The most popular envelope size worldwide, perfectly designed for unfolded A4 documents, standard business correspondence, and official paperwork.

Physical Dimensions
Exact measurements in multiple units for precision printing and design
229 × 324 mm
9.02" × 12.76"
649 × 918 pt

Used in desktop publishing software

54 × 76 pc

Traditional typography unit

22.9 × 32.4 cm

Metric system measurement

Digital Dimensions (Pixels)
Pixel dimensions for different DPI settings - essential for digital design and printing
72 DPI (Screen)

Standard screen resolution for web and digital display

649 × 918 px
150 DPI (Draft Print)

Good quality printing for drafts and proofs

1352 × 1913 px
300 DPI (High Quality Print)

Professional printing standard for high-quality output

2705 × 3827 px
Common Applications
How and where C4 is typically used across different industries and contexts

Business Applications

  • Business letters
  • Legal documents
  • Reports
Visual Scale
Relative size representation
C4229 × 324mm

Scaled representation (not actual size)

Quick Tools
Size ConverterAll Paper SizesTemplates
Related C Series
Other sizes in the same series
C0C1C2C3C5C6

Technical Standards

Series: C

Aspect Ratio: 1:√2 (1.414)

Standard: ISO 269

Origin: International (ISO)

✦ Features

C4 Paper Size Advantages

Discover the key advantages and applications of C4 paper size for your projects.

Perfect Dimensions

C4 measures 229 × 324 mm, ideal for professional applications.

International Standard

Part of the C series, C4 follows international standards for global compatibility.

Versatile Applications

Perfect for A4 envelopes, Business letters and many other professional uses.

Print Ready

Optimized for both digital display and high-quality printing with precise pixel dimensions.

Multiple Units

Available in millimeters, inches, and pixels - 9.02" × 12.76" in imperial units.

Universal Compatibility

Works seamlessly with all major design software, printers, and international standards.

FAQ

C4 Questions & Answers

Common questions about C4 paper size and its applications.

What are the exact dimensions of C4?

C4 measures exactly 229 × 324 millimeters or 9.02 × 12.76 inches.

What is C4 commonly used for?

C4 is commonly used for A4 envelopes, Business letters, Legal documents among other applications.

What series does C4 belong to?

C4 belongs to the C series, which is part of international paper size standards.

What are the pixel dimensions of C4?

For digital use: 649 × 918 pixels at 72 DPI, 2705 × 3827 pixels at 300 DPI for high-quality printing.

Can I use C4 for professional printing?

Yes, C4 is perfect for professional printing. It follows international standards and provides excellent print quality for business and creative applications.

Which design software supports C4?

C4 is supported by all major design software including Adobe Creative Suite, Figma, Sketch, Canva, and Microsoft Office applications.