Paper Shredder Security Levels DIN 66399

Which security level do you need for paper shredding?

When you are looking for a new shredder for home or at the office you often see the security level of a paper shredder. For instance DIN P2, P3 or P4. What does the security level mean and why is it important to pay attention to it when you are buying a new shredder machine? On this page, we explain the shredder security levels.

Read more about paper shredders in our shredder guide.

What is DIN 66399?

When you look at the specifications of a paper shredder you often see the security level with a DIN classification next to it. For example DIN P-1, or DIN P-3. But what does it mean? The DIN P-level is part of the official German DIN 66399 standard (since 2012) which is the international standard for secure shredding of data media developed by the Deutsches Institut für Normung (DIN) which translates to the German Institute for Standardization.

This DIN-norm contains destruction requirements for multiple media categories. Namely paper, film, optical media, magnetic data media, hard drives and electronic data media.

DIN 66399 (before DIN 32757) classifies the security levels for six media categories. Such as hard drives (H), optical media (O) and paper-based products (P). For paper, there are seven security levels. The levels range from DIN P-1 to DIN P-7. The higher the DIN level the smaller the paper particles become after shredding a document.

The seven security levels are divided in thee protection classes. Some security levels overlap two protection classes:

Protection class 1

• Normal security for internal data
• Security level: DIN P-1, DIN P-2, DIN P-3

Protection class 2

• High security for confidential data
• Security level: DIN P-3, DIN P-4, DIN P-5

Protection class 3

• Very high protection for confidential and secret data
• Security level: DIN P-4, DIN P-5, DIN P-6, DIN P-7

For most shredding needs we recommend a paper shredder that falls in protection class 2 with a DIN P-3, DIN P-4 or DIN P-5 security level. These shredders suffice most requirements for secure shredding of confidential documents.

DIN P: The size of the particle

The security levels for paper shredders are part of the official DIN 66399 standard for paper destruction. This standard contains seven security levels for paper destruction which indicates the minimal requirements for the size of the paper particles after shredding a document. The seven security levels are DIN P-1, P-2, P-3, P-4, P-5, P-6 and P-7. The higher the number the smaller the size of the particle gets.

For instance when you are looking for high security and want small particles, then you are better off with a P-5 paper shredder than a P-2 paper shredder. That is because the paper particles from a P-5 micro-cut shredder are very small in comparison with the strips of a P-2 strip-cut shredder.

Particle size

Besides security levels you can also find the cut type of paper shredders. All paper shredders are divided in three types of paper cuts. These are strip-cut, cross-cut and micro-cut. Below you can see all the security levels from the German DIN 66399 standard for paper destruction:

1. Strip-cut – Low level of security
2. Cross-cut – Medium level of security
3. Micro-cut – High level of security

Cross-cut and micro-cut

There is some confusion about the difference between a cross-cut or micro-cut shredder. Officially a micro-cut shredder is classified as a P-5, P-6 or P-7 shredder. But you will see that a lot of paper shredder manufacturers and stores classify a DIN P-4 shredder as a micro-cut shredder as well. We see this for shredders that are offered in the US. Fellowes tells us that “the reason for this is that in the US the term micro-cut is used on some P-4 Machines, whereas in Europe it is only P-5.”

Since it is very common that a P-4 shredder is called ‘micro-cut’ or ‘high security’, we also use this term for DIN P-4 classified shredders.

A DIN P-4 shredder offers more security than a P-3 shredder. Some P-4 shredders do produce very small paper particles after shredding a document, which makes the particles more ‘micro-cut’ than a P-3 cut. DIN 66399 states that a P-4 shredder should shred particles smaller than 320 mm² or 0.5 in².

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Security Level: DIN P-1
Strip-cut Paper Shredder

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Security Level: DIN P-2
Strip-cut Paper Shredder

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Security Level: DIN P-3
Cross-cut Paper Shredder

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Security Level: DIN P-4
Cross-cut / Micro-cut Paper Shredder

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Security Level: DIN P-5
Micro-cut Paper Shredder

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Security Level: DIN P-6
Micro-cut Paper Shredder

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Security Level: DIN P-7
Micro-cut Paper Shredder

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Paper shredder information and recommendations

Which paper shredder is the best shredder for you to buy? Visit our paper shredder page with all the information you need about paper shredders. You can also find recommendations for the best paper shredders you can buy at Amazon.com.

Compare strips and shreds

Which shredders do we recommend?

For destroying sensitive documents with personal information, medical information, financial information or other confidential information we recommend making use of a cross-cut shredder or a micro-cut shredder. Read more about these types of paper shredders here:

• Strip-cut paper shredders
• Cross-cut paper shredders
• Micro-cut paper shredders