What Is a Self-Signed SSL Certificate?
A self-signed SSL certificate is an SSL certificate that is signed by the same person, server, or organization that created it instead of being verified by a trusted Certificate Authority. It can still help encrypt a connection, but browsers and devices may not trust it because it was not validated by a recognized certificate provider.
For most public websites, a trusted SSL certificate is recommended. A trusted SSL certificate helps visitors access your site through HTTPS without browser warnings and provides a more reliable experience for customers.
What Is a Self-Signed SSL Certificate?
A self-signed SSL certificate is created and signed by its own owner. This means the certificate was not reviewed or issued by a trusted Certificate Authority, also called a CA.
A Certificate Authority helps confirm that an SSL certificate belongs to the correct domain or organization. When a certificate is issued by a trusted CA, browsers are more likely to recognize it as valid.
With a self-signed certificate, that third-party trust check is missing. Because of this, visitors may see a warning before accessing the website, even if the site owner created the certificate intentionally.
Why Self-Signed SSL Certificates Are Not Recommended for Public Websites
A browser warning may say something like:
- Your connection is not private
- This connection is not trusted
- The certificate is not trusted
- The site’s security certificate is not from a trusted source
- Attackers might be trying to steal your information
These warnings can confuse visitors and may cause them to leave the site before continuing.
Self-Signed SSL vs Trusted SSL Certificate
The main difference is who verifies the certificate.
| Certificate Type | How It Works | Best Used For |
|---|---|---|
| Self-signed SSL certificate | Created and signed by the same owner or server | Testing, private systems, internal tools |
| Trusted SSL certificate | Issued and verified by a trusted Certificate Authority | Public websites, customer logins, ecommerce, business sites |
A trusted SSL certificate is the better option for websites that customers, clients, or visitors access regularly.
When Will You Get a Self-Signed SSL Certificate
A self-signed SSL certificate may occur in different situations, especially on VPS or Dedicated servers.
Common situations include:
- A service SSL certificate was reset.
- A trusted SSL certificate expired or was removed.
- A server generated a temporary SSL certificate.
- A website or service was set up before a trusted SSL was installed.
- A private or testing environment uses its own certificate.
- WHM, cPanel, or webmail is using a temporary certificate.
After resetting service SSL certificates on a VPS or Dedicated server, the system may issue a self-signed certificate. Bluehost recommends replacing it with a trusted certificate because self-signed certificates can trigger browser warnings.
Are Self-Signed SSL Certificates Secure?
A self-signed SSL certificate can still encrypt data between the browser and the server. However, encryption alone does not make it a good choice for public websites.
The issue is trust. Since the certificate is not verified by a trusted Certificate Authority, visitors cannot easily confirm that the certificate belongs to the correct website.
For public websites, this can create problems such as:
- Browser security warnings
- Lower visitor trust
- Confusion during checkout or login
- Issues with email clients, apps, or integrations
- A less professional customer experience
For this reason, self-signed SSL certificates are usually best limited to private testing or internal use.
Why a Trusted SSL Certificate Is Better
A trusted SSL certificate is issued by a recognized Certificate Authority. This helps browsers confirm that the certificate is valid for the domain.
Using a trusted SSL certificate can help:
- Display HTTPS correctly
- Reduce browser security warnings
- Build visitor confidence
- Protect login and form submissions
- Support ecommerce and payment pages
- Improve the overall trustworthiness of your website
Bluehost offers guidance for managing free SSL certificates with Let’s Encrypt and installing paid or third-party SSL certificates depending on your hosting setup.
Summary
A self-signed SSL certificate is created and signed by its own owner instead of being issued by a trusted Certificate Authority. While it may encrypt the connection, browsers usually do not trust it and may show security warnings to visitors.
Self-signed SSL certificates may be acceptable for private testing or internal systems, but they are not recommended for public websites. For customer-facing websites, WordPress sites, login pages, and ecommerce stores, use a trusted SSL certificate such as a free Let’s Encrypt SSL, paid SSL, or properly installed third-party SSL certificate.
If you need further assistance, Bluehost Chat Support is available 24 hours a day, 7days a week while Bluehost Phone Support is available 7 days a week from 7 am-12 midnight EST.
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You may also refer to our Knowledge Base articles to help answer common questions and guide you through various setup, configuration, and troubleshooting steps.