CER File — Open & Convert .cer Online
What Is a .cer File?
CER (.cer) is a security file format. CER is a certificate file in DER or Base64 format. Created by Various, this format is essential for security analysts.
How to Open .cer Files
Upload your .cer file to OpenAnyFile and instantly inspect and validate it in your browser. No software installation required. Works on Windows, macOS, Linux, iPhone, and Android.
Everything About CER Files
Popular CER Conversions
Frequently Asked Questions
What is a .cer file?
A .cer file is a security format called CER. CER is a certificate file in DER or Base64 format.
How do I open a .cer file without installing software?
Upload your .cer file to OpenAnyFile. Our browser-based tool instantly detects and displays it — no downloads needed.
What program creates .cer files?
.cer files are typically created by Various.
Can I convert .cer to another format?
Yes. OpenAnyFile converts .cer to PEM, CRT, DER.
Is it safe to open .cer files online?
Yes. OpenAnyFile processes files in a secure, isolated environment. Files are automatically deleted and all transfers use HTTPS.
Can I open .cer on my phone?
Yes. OpenAnyFile works on all mobile browsers including iPhone and Android.