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Welcome to the CSS Computer Security Service Website


CSS Computer Security Service GmbH was founded in Essen in October 1984 to provide innovative solutions in the field of computer security. Today we offer the necessary hardware and software for the security industry, security engineers and all companies with sensitive control tasks.

Thanks to 35 years of experience with guard control systems and customers in Germany, the Benelux countries, Austria, Switzerland and Slovenia, as well as an international network of suppliers and trading partners, we can provide you with expert advice and work with you to find the right solution for your requirements - naturally at a fair price-performance ratio.  Furthermore, we offer you competent German-language support, instruction and training via remote maintenance or on-site and after-sales service by our employees.



35 Jahre Erfahrung

35 years of market experience

Faires Preis-Leistungs-Verhältnis

Fair price-performance ratio

Produkte für Ihre Sicerheit

Products for your safety

Start: Willkommen



Key management

Discover the solution for storing and organizing your keys. The automatic delivery & return saves you time and creates transparency. Every movement is recorded in an audit-proof manner .

Guard control systems

Be it for single objects with a few inspection points or for large areas with many separate objects - we offer security service providers the right guard control systems. Also as an online solution and with ATEX certification .


Repair and maintenance

Do you have any damage to your product? No problem!

We take over the direct repair service for you and take care of necessary maintenance work.

Personal advice

Call center? No thanks! Our employees are personally at your disposal for all matters.

ID card creation

You can easily create professional ID cards in your own design. With our practical software and our powerful card printers, this is lightning fast.

Training by our own employees

You will receive intensive and practical training on our products from our own team.

After-sales support

We will also be happy to help you with any questions or requests after your purchase.



Vollmergruppe Dienstleistung, Mülheim

We have been well looked after for over 25 years. The CSS GmbH team looks after a partnership-based collaboration and has accompanied us over the years with regular system updates and new WKS solutions in the constant modernization.

Stadtwerke Lünen GmbH

CSS GmbH takes care of our constantly growing tasks and provides us with an innovative key management syste. Good communication, short-term problem solving and quick implementation of customized IT special services are to be emphasized.

WSD-Werkschutzdienst Sicherheitsdienste Grether e.K

Security means prevention: In accordance with this motto, security is also a top priority in key management. With the mobile safe OKKI, the keys of our clients are also optimally stored during tours - this gives our customers and employees at the same time a comfortable feeling. 

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