By Hridoy Ahmed | Last updated: October 2026 | 6 min read
Short answer: An SSL certificate (today called a TLS certificate) lets your website use HTTPS, which encrypts the data between your visitor’s browser and your server. Every website should have one. Without it, browsers can mark your site “Not secure”, logins and forms are exposed, and visitors lose trust. Most hosts give you a free certificate, so there is no good reason to skip it.
In this guide
- What an SSL certificate does
- Why your website needs one
- Types of certificates
- How to set it up on WordPress
- Common mistakes
- FAQ
What an SSL certificate does
When a visitor opens your site over HTTPS, the certificate proves the site is really yours and encrypts the connection. That stops other people on the same network from reading the data in transit, such as passwords, contact form entries and payment details. The older name SSL is still used everywhere, but the technology in use today is TLS.
Why your website needs one
- Security. It protects logins, forms and checkout pages.
- Trust. Browsers warn visitors about HTTP pages, especially pages with forms. A warning makes people leave.
- SEO. Google has said HTTPS is a lightweight ranking signal. It will not carry a weak page, but an HTTP site is a clear disadvantage.
- Modern features. Many browser features only work on HTTPS.
Types of certificates
- Domain Validated (DV). Confirms you control the domain. Fast and often free, for example from Let’s Encrypt. Enough for most sites.
- Organization Validated (OV) and Extended Validation (EV). Also check the business identity. The encryption is the same strength as DV. They can add trust for large businesses, but a DV certificate is fine for most small sites.
How to set it up on WordPress
- Turn on the free SSL in your hosting panel. Most hosts have a one-click option.
- Set your site address to HTTPS. In WordPress go to Settings, General and change both URLs to start with https://.
- Redirect HTTP to HTTPS. Make sure every old HTTP URL redirects to its HTTPS version with a 301 redirect.
- Fix mixed content. See my guide to fixing mixed content warnings.
- Update Search Console. Add the HTTPS version as a property and submit your sitemap again.
- Check the renewal. Make sure the certificate renews automatically.
If you are moving a site to HTTPS and want to avoid losing rankings, see my website maintenance and migration service.
Common mistakes
- Letting the certificate expire
- Installing SSL but leaving HTTP pages without a redirect
- Leaving mixed content on the page
- Forgetting to change the sitemap and canonical URLs to HTTPS
- Paying for a certificate when your host gives a free one
FAQ
What does an SSL certificate do?
It encrypts the connection between the visitor and your server and confirms your site is genuine.
Is SSL the same as HTTPS?
HTTPS is the secure version of HTTP. The SSL/TLS certificate is what makes HTTPS work.
Does SSL help SEO?
Google has said HTTPS is a lightweight ranking signal. It helps, but it will not rank a weak page.
Can I get an SSL certificate for free?
Yes. Let’s Encrypt provides free certificates, and many hosts install them for you.
Why does my site still say “Not secure”?
It may still load some files over HTTP (mixed content), or the certificate may be missing or expired.
Need help moving to HTTPS safely? I can handle the setup, redirects and checks. See my website maintenance and migration service.
About the author: Hridoy Ahmed is an SEO specialist and WordPress security expert based in Dhaka, Bangladesh. He has 8+ years of experience and works with clients worldwide.