网站地址栏的”小绿锁”（HTTPS）靠的就是 SSL 证书。现在上 HTTPS 可以完全免费。
什么是 SSL / TLS 证书
它加密浏览器和服务器之间的通信，让地址变成 https:// 并显示锁标。现代网站必备——不上 HTTPS 浏览器会标”不安全”，也影响 SEO 和信任。
免费方案（个人 / 中小站够用）
Let’s Encrypt：完全免费、90 天有效、自动续期。用 certbot / acme.sh 或面板（宝塔/1Panel）一键签发。
其它方式
- 套 CDN（如 Cloudflare）也能免费提供 HTTPS。
- 付费证书（EV/OV、通配符、带保险）一般只有企业才需要。
提醒
免费证书足够绝大多数站；记得配好自动续期，别让证书过期导致网站报错。需要 443 端口 放行。
The “padlock” (HTTPS) in your browser’s address bar is powered by an SSL certificate. Getting HTTPS today is completely free.
What Is an SSL / TLS Certificate?
It encrypts communication between the browser and the server, turning your address into https:// and displaying the lock icon. It’s essential for any modern website — without HTTPS, browsers flag your site as “Not Secure,” and it hurts both SEO and visitor trust.
Free Options (More Than Enough for Personal and Small Sites)
Let’s Encrypt: Completely free, valid for 90 days, with automatic renewal. Issue a certificate with certbot / acme.sh or through a control panel (aaPanel / BT Panel) in just a few clicks.
Other Methods
- Proxying through a CDN (e.g., Cloudflare) also provides free HTTPS.
- Paid certificates (EV/OV, wildcard, with insurance) are generally only needed by enterprises.
Reminder
A free certificate is sufficient for the vast majority of sites. Make sure to configure automatic renewal — an expired certificate will cause your site to show errors. Port 443 must be open in your firewall.
Pick a VPS at Stock Monitor, or head back to the Knowledge Base for more guides.
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