Open 509 file

The most common choise: Certificate file

How to open Certificate file .509 files

509 file icon Have you had trouble opening the 509 file on your computer? What are 509 files? We explain what they are and recommend software that we know will open them.

What is 509 file?

Files with 509 extension are associated with internet security of your server, web sites etc.

Certificate file description

The 509 file extension is used to secure your server, web site transactions, logins, webmail and connections with an SSL Certificate. Choose GlobalSign SSL Certificates for the highest levels of strong security, confidence and trust in your web site, corporate assets and online brand.

Mime: application/x-x509-ca-cert

Suggested software to open 509 file

Opera browser

A popular iInternet web browser and communiation suite


A popular free web browser from Mozilla

Microsoft Internet Explorer

The default web browser for older versions of Microsoft Windows. Replaced by Microsoft Edge browser.

What file extension actually is?

Simply put, file extensions are the characters after the dot in the computer file name, so for example document-name.pdf has file extension „pdf“. This helps Windows to identify which program should be used to open the file.

We can help you to open your file

Our database contains a huge list of different file extensions, usually with detailed description and programs that can be used to open or otherwise work with that particular file type.

Only original software

Every software listed in our database is verified and ve provide link to the developer or to the software own website, which should hopefuly be enough for you to download the most recent version of the program.