
C size paper — use the right size for the right document
Give wings to your documented communications for unforgettable brand identity.
Why you need the right paper size
C size paper is used for envelope purposes. The ISO 269 International Standard determines the dimensions of C paper size for paper sizes. The C size paper falls in between its counterparts — A and B paper sizes. The C series paper comes handy for documents created from A and B paper sizes. The right size envelope makes it easy for the document to be placed in.
C series paper sizes
Size | Dimensions |
---|---|
C0 | 36.1 x 51.06 cm |
C1 | 25.51 x 36.1 cm |
C2 | 18.03 x 25.51 cm |
C3 | 12.76 x 18.03 cm |
C4 | 9.02 x 12.76 cm |
C5 | 6.42 x 9.02 cm |
C6 | 4.49 x 6.38 cm |
C7 | 3.19 x 4.49 cm |
C8 | 2.24 x 3.19 cm |
C9 | 1.57 x 2.24 cm |
GREAT C SIZE PAPER EXAMPLES FROM SMALL & ONLINE BUSINESSES



How can you use size C paper?
The C size paper area is the geometric mean of the A and B series paper areas of the same number. For example — as compared to A4 paper size, the C4 area is bigger but smaller than the B4 area. Hence, for A4 paper size, a C4 envelope is required. Talk of the aspect ratio of C paper size envelopes, and it is 1:√2. It simply means, an A4 paper fits nicely into a C4 envelope, when folded in half will fit perfectly into an envelope sizing C5. When you fold the paper twice, you can fit it into a C6 envelope, and it goes on.
C size paper envelopes best practices
Printing your envelopes prior to the conversion process provides an effective way to catch the attention of your audience. Try adding graphics on the exterior of the envelope or print the inside area. You can even print your envelopes in different colors. These tiny details make a significant impact on people.
Whether you're ordering envelope for personal use or commercial use, it's essential to consider the cost. For example, ordering envelope in a large quantity (say 5000) and then customizing it, embossing it, and printing it may prove to be expensive. Even though customization being a time-consuming process, if its cost falls within your budget, you get the benefit of its incredible first impression. For small organizations that have to send envelopes to their customers, considering all the cost factors are essential.
No matter how impressive your C size envelopes are, if the post office won’t deliver it, it’s of no use. Therefore you need to restrict the use of information like return address and graphics to the upper left corner of the envelope to meet the post office regulations. Plus, the face of the envelope has to be blank. This lets the post office to add necessary information or add the address of the recipient.
C size envelope mistakes to avoid
Some of the most common envelope mistakes to avoid are:
Envelopes are effective communication tools
The most important part of an envelope of size C or any other is that they remind us - both our message and the way we deliver it are essential.
It doesn’t matter how we communicate — writing, presenting, speaking, blogging, or any other in-person communication, the importance of envelopes is indisputable. We need to consider its significance, irrespective of its size.
Whether it's for branding purposes or in-personal use, don't just take a turn to throw word-arts but create an effective communication through envelopes.
Where can you find the best envelope ideas and inspiration?
Some of the best C size paper envelopes are those that have been designed by sourcing ideas and inspiration.
Platforms like Designhill, Canva, and many others are famous among marketing professionals as well as designers for C size envelope ideas and inspiration.
Still, there are some designers and marketing professionals who utilize their creativity and use original graphics or artwork.
Just consider the right dimensions of the C size paper envelopes for effective design.

Final Thoughts
People consider envelopes as a tool for business correspondence, personal mailing info, and marketing. One should never forget that envelopes, whether made of C size paper or any other dimensions, are as important as the message they deliver. They let your audience identify who you are as a business/brand. An envelope helps your brand message be noticeable, among others.
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