Envelope sizes & envelope formats: The comprehensive DIN overview

Standard formats and special formats for envelopes

Standard paper sizes make daily correspondence and the creation of letters and documents much easier. Shipping and delivery are simplified by globally recognized standards for envelopes and mailing bags, as they are perfectly matched to common paper sizes. DIN envelope sizes also enable efficient machine processing, such as printing and franking. These standards are also indispensable for modern postal services: automatic sorting in distribution centers is accelerated by the specified standard sizes. As with paper cutting, the German Industrial Standard (DIN) also applies to envelope formats, with DIN 678 defining the basic requirements. In our shop, we offer a huge selection of these standardized envelopes so that you can find the right envelope for every type of content.

In addition to the classic DIN A and DIN C formats, the DIN long format (DL) is the most common size used in business and private correspondence. It is primarily used for sending documents that are folded to one-third of their height. At Kuvertwelt.de, you can order a wide range of DIN long envelopes directly online. The following dimensions apply here:
Dimensions in mm DIN Long envelope: 110 x 220
Dimensions in mm DIN Long contents: 98-105 x 210

History of DIN formats

The DIN formats were established as standard sizes by the German Institute for Standardization back in 1922. Today, a distinction is made between the A, B, C, and D series. The corresponding class ranges from 0 (largest unit) to 10 (smallest unit). Envelopes in sizes C5, C6, and DIN Long are the all-rounders for cards and letters. While folding cards in DIN A6 format fit perfectly into handy C6 envelopes, C5 envelopes are usually ideal for DIN A5 contents. DIN A4 sheets can either be folded twice and sent in DIN Long envelopes or sent unfolded in C4 mailing envelopes.

Use of the different envelope formats in practice

In everyday practice, DIN C5/6 (DL) and DIN C4 formats dominate business correspondence. While the classic DL format is often used for manual enveloping, the slightly larger C6/5 size is frequently used for machine processing. In the private sphere, standard C6 envelopes are the most widely used, as they are ideal for common greeting cards and greeting cards. For official documents, such as certificates or contracts, which must not be folded, sturdy C4 format mailing envelopes are the first choice. When sending mail, always bear in mind that both the format and the weight affect the postage costs. In our shop, you benefit from attractive bulk prices: the more you order for your needs, the cheaper the individual product becomes.

• Special features: Strict compliance with DIN standards for smooth postal delivery; huge selection of colors and adhesive techniques.
• Intended use: Sending documents, invoices, flyers, certificates, and private letters.
• Area of application: Universally applicable in offices, government agencies, agencies, and private households.

Special formats – When standards are not enough

Despite the variety of standard sizes, there are some items that require special formats. Whether it's unusual advertising mailings or square invitation cards, sometimes a custom size is needed. In such cases, square envelopes are often used, as their shape makes them immediately eye-catching. Our range also includes narrow special formats for reply letters that need to fit into a standard envelope. If you have very specific requirements, as a manufacturer we also offer the production of custom-made items. A major advantage of Kuvertwelt.de is that you can order all items by the piece – we deliver from as little as 1 item.

The weight of envelopes and mailing bags

The weight of a shipment is crucial for calculating postage. The weight can be determined using a simple formula based on the paper weight and envelope dimensions. This allows you to keep track of shipping costs at all times. We ship your order quickly, no later than one business day after receiving your order, so that you can use your envelopes promptly.

In addition to our comprehensive guide, we offer the right packaging for every purpose—from festive envelopes to practical office solutions. Our expert customer service team will be happy to advise you on all questions relating to formats and grammages. Order your envelopes easily and securely online from your postal service experts.