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The ultimate guide to envelope sizes

The art of direct mail or sending a letter has not lost its charm or effectiveness.

Despite the surge in email communications, direct mail continues to be a potent tool for businesses aiming to establish a tangible connection with their audience. Sending a letter is also often the preferred contact method for people receiving bills.

This traditional approach offers a personal touch that emails often fail to convey, leading to higher engagement rates and a stronger impression on the recipient.

Standard envelope sizes

Understanding the standard sizes of envelopes is fundamental for efficient and effective direct mail campaigns and business communication. In Australia, envelope sizes are typically measured in millimetres and are designed to accommodate various types of documents. 

Here’s a rundown of the most common envelope sizes and their typical uses:

A4 to C4 Envelope Infographic

C4 envelopes

(229mm x 324mm): This size is perfect for holding A4 documents without folding, ideal for sending important contracts, certificates, and presentations.

A4 to C5 Envelope Infographic

C5 envelopes

(229mm x 162mm): Suitable for A5 documents or A4 documents folded in half. It’s commonly used for direct mail campaigns, brochures, and promotional materials.

A4 to C6 Envelope Infographic

C6 envelopes

(162mm x 114mm): Designed for A6 materials or A4 documents folded in quarters. This size is often used for personal letters, Christmas cards, and invitations.

A4 to DL Envelope Infographic

DL envelopes

(220mm x 110mm): This size accommodates A4 documents folded into thirds, making it the standard choice for business correspondence, including invoices, letters, and statements.

Large Brochure to B4 Envelope Infographic

B4 envelopes

(250mm x 353mm): Larger than C4, this envelope is used for oversized documents that need to be sent without folding, such as posters or large brochures.

Selecting the right envelope size not only ensures that your documents are protected but also helps in reducing postage costs by avoiding unnecessary bulk. It’s essential to match the envelope size with the content to maintain professionalism and ensure that your direct mail is received and perceived as intended.

Branded envelopes

When it comes to reinforcing your brand’s identity, custom-printed envelopes play an important role. They are often the first point of contact with your clients and prospects, making it essential to leave a lasting impression. Printing envelopes with your brand’s logo, colours, and design not only enhances brand recognition but also conveys professionalism and attention to detail. This customisation process ensures that every piece of mail you send contributes to building your brand’s image and trustworthiness in the eyes of your recipients.

Branded business stationery

Don’t forget to complement your branded envelopes with matching letterhead and business stationery. This cohesive approach to your business’s physical correspondence ensures a uniform and professional appearance that reinforces your brand identity at every touchpoint. By ensuring consistency across all your printed materials, you’re not just sending a message; you’re delivering a piece of your brand, making every interaction an opportunity to leave a lasting impression.

Understanding the right envelope sizes for your business mailings is essential for both practicality and presentation. For expert advice on selecting and printing envelopes that match your brand and suit your mailing requirements, contact your local Worldwide centre

Our team specialises in providing a range of envelope sizes and custom printing options to ensure your correspondence is professional and on-brand. Let us help you navigate the options to find the perfect fit for your business needs.


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