What is a .CER File And How To Open It (Easy Steps)

Table of Contents

Introduction

Have you downloaded a file with .cer extension, but you have never seen this extension before? Perhaps you know what the file is, but you simply don’t know how to open it. That’s why we have made this article! You will learn how to open the .cer file extension on various systems, what it is and how to work with it.

What is a .CER file?

The file extension .CER is from Internet Security Certificate.The format of this web related file is binary.

What to know

There are currently 4 software that can open the .cer file on 3 platforms.

How to open a .CER file?

Below you can find an easy to understand, step-by-step guide to open the .CER file on your operating system/device.

How to open a .CER file on Windows (7, 8, 10)

We have written below an easy-to-understand guide on how to open the .cer file on Windows in 4 easy steps.

1. The first step is to download the Microsoft Internet Explorer and Mozilla Firefox software. You will be using this software in order to open the file.

Step 2

Step 2: Locating your .CER file

2. The second step is locating the downloaded file. The file can be usually found in your /download/ folder if you don’t remember where you have downloaded it to.

Step 3

Step 3: Choose “Open with”

3. In the third step right click on your file and choose “Open with”.

Step 4

Step 4: Choose the software and click ok

4. After choosing the “Open with” option, you will have an option to choose the Microsoft Internet Explorer software you have downloaded. Choose your software and click on “OK”. That’s all, now you have opened your file on Windows.

How to open a .CER file on Mac

Below you can see a visual guide on how to open the .cer file on Mac in 4 easy steps.

1. The first step is to download the Apple Safari, Mozilla Firefox and Apple Keychain Access software. You will be using this software in order to open the file.

Step 2

Step 2: Finding your .CER file

2. The second step is locating the downloaded file. If you don’t remember where you have downloaded your file to, you should check your /download/ folder as it usually gets automatically saved there.

Step 3

Step 3: Clicking “Open with”

3. In the third step right click on your file and choose “Open with”.

Step 4

Step 4: Choosing the software to open your file

4. After choosing the “Open with” option, you will have an option to choose the Apple Safari software you have downloaded. Choose your software and click on “OK”. Congratulations! You have opened your file on Mac.

How to open a .CER file on Linux

There are 4 simple steps to open the .cer file on Linux.

1. In the first step you need to download the Mozilla Firefox software. You will be using this software in order to open the file.

Step 2

Step 2: Locate the .CER file

2. The second step is locating the downloaded file. If you don’t remember where you have downloaded your file to, you should check your /download/ folder as it usually gets automatically saved there.

Step 3

Step 3: Hover over the “Open with” button

3. In the third step right click on your file and choose “Open with”.

Step 4

Step 4: Open the file choosing the software

4. After choosing the “Open with” option, you will have an option to choose the Mozilla Firefox software you have downloaded. Click on the software and click “OK”. That’s all, now you have opened your file on Linux.

Still cannot open the .CER file?

If you cannot open the .CER file, it is entirely possible that you are trying to open the wrong file. There are many similar file extensions that look like the .CER file.cerber – Cerber Ransomware Encrypted File, .cerber2 – Cerber2 Ransomware Encrypted File, .cerber3 – Cerber Ransomware Virus File, .certsigningrequest – Apple, .cetrainer – Cheat Engine. You might be trying to open the wrong file, please recheck if you are trying to open the right file extension again.

Conclusion

In this article you have learned how to open the .CER file with the Microsoft Internet Explorer, Mozilla Firefox programs on Windows, Apple Safari, Mozilla Firefox, Apple Keychain Access programs on Mac and Mozilla Firefox software on Linux.