Certificate Guides
Short, practical guides for people who deploy certificates on servers, devices and internal systems.
How to Check a Certificate's Details, SAN and Expiry
Which fields actually matter — subject, issuer, SAN, validity, key usage, fingerprints — and how to check them in a browser or with OpenSSL.
How to Check If a Private Key Matches a Certificate
Three ways to confirm a key and certificate are a pair before deployment, and why pairs get mixed up.
PEM vs DER vs CRT vs PFX: Formats Explained
Encodings vs containers, which file holds what, conversion commands, and which format your device probably wants.
证书指南
给在服务器、设备和内部系统上部署证书的人准备的简短实用指南。
如何查看证书的详细信息、SAN 和有效期
到底哪些字段才重要——主体、颁发者、SAN、有效期、密钥用法、指纹——以及如何在浏览器或用 OpenSSL 检查它们。
如何核对私钥与证书是否配对
在部署前确认私钥和证书是一对的三种方法，以及配对为什么会被搞混。
PEM vs DER vs CRT vs PFX：格式详解
编码与容器的区别、每个文件里装的是什么、转换命令，以及你的设备大概想要哪种格式。
立即试用：打开 CertView 证书查看器，把证书文件拖进去，文中讲的每个字段都会立刻解码出来——全程在你的浏览器里完成，不上传任何东西。Try it now: open the CertView certificate viewer, drag your certificate file in, and every field in this guide is decoded instantly — in your browser, with nothing uploaded.