Understanding SSL Certificate Trust Levels and SEO

What “trust level” means for a certificate

An SSL/TLS certificate does two jobs. It lets the browser set up an encrypted connection, and it binds a public key to a domain name so the browser knows it is talking to the right server. Every publicly trusted certificate does both jobs equally well. The encryption strength depends on the key type and the TLS configuration of your server, not on how much you paid for the certificate.

The “trust level” of a certificate refers to something else: how much identity checking the certificate authority (CA) performed before issuing it. The industry rules for that checking are set by the CA/Browser Forum, and there are three main levels: Domain Validation, Organization Validation and Extended Validation.

Site owners often ask whether a higher level improves search rankings. The short answer is no. The longer answer, covered below, explains why and what actually matters for SEO.

Domain Validation (DV)

A DV certificate proves only that the applicant controls the domain. The CA checks this with an automated challenge, typically one of these methods:

• Placing a specific file at a known path on the website (HTTP challenge)
• Adding a specific TXT record to the domain’s DNS (DNS challenge)
• Responding to an email sent to an approved address for the domain

Because validation is automated, DV certificates can be issued in minutes and are widely available for free through CAs such as Let’s Encrypt using the ACME protocol. A DV certificate contains the domain name but no verified organisation name. It is the most common type on the web today and is entirely appropriate for blogs, business sites, shops and applications.

certbot certonly --webroot -w /var/www/example -d example.com -d www.example.com

Organization Validation (OV)

An OV certificate includes domain control checks plus verification of the organisation behind the domain. The CA confirms that the business legally exists, typically using official registries or other documentation, and includes the organisation name and location in the certificate’s subject fields.

Issuance takes longer, from a day to several days depending on the CA and how quickly documents are verified, and OV certificates are paid products. The organisation details are visible only if someone opens the certificate viewer in their browser, which most visitors never do.

Extended Validation (EV)

EV certificates follow the strictest guidelines. In addition to OV checks, the CA verifies things such as the organisation’s legal, physical and operational existence, the applicant’s authority to request the certificate, and other details defined in the EV Guidelines. EV is generally the most expensive and slowest type to obtain.

The end of the green address bar

For years, browsers rewarded EV certificates with a prominent display: the company name, often in green, next to the address. Around 2019, Chrome and Firefox moved that information out of the main address bar and into the page information panel, and Safari also stopped highlighting EV names. Browser vendors cited research suggesting users did not notice or act on the indicator, and concerns that company names could be confusing or misleading, since different companies in different jurisdictions can register similar names.

Today an EV site looks the same in the address bar as a DV site. The organisation name is still in the certificate, but a visitor has to click through to see it. Some organisations still choose EV for policy, compliance or contractual reasons; that is a business decision, not a visibility or SEO one.

Comparing DV, OV and EV

Prices and timelines vary between CAs, so check your provider for current details. Wildcard and multi-domain options exist across levels; see our guide to wildcard certificates.

How HTTPS affects SEO

Google announced in 2014 that HTTPS is a ranking signal, and described it as a very lightweight one. It later became part of the page experience signals. In practice, HTTPS rarely moves a page ahead of a more relevant competitor, but serving a site without it carries real costs:

• Browsers label HTTP pages as “Not secure”, especially on pages with forms, which can reduce trust and conversions.
• Modern browser features and protocols such as HTTP/2 in browsers require HTTPS.
• Referral data from HTTPS sites linking to an HTTP site may be stripped, making analytics less accurate.

Google has been clear that it does not distinguish between certificate validation levels for ranking. A free DV certificate and an expensive EV certificate receive the same treatment. Google’s own documentation recommends using certificates with strong keys and keeping them valid, without recommending a specific trust level.

Certificate issues that do hurt SEO

While the certificate type does not matter, how you run HTTPS matters a great deal. These problems can damage traffic quickly:

Expired certificates

When a certificate expires, browsers show a full-page warning and most visitors leave. Crawlers may also fail to fetch pages. Certificate lifetimes are shrinking: the CA/Browser Forum has approved a phased reduction of the maximum validity period over the coming years, so manual renewal becomes less practical. Automate renewal and monitor expiry separately, because automation can fail silently. Tracking certificates in the TLDix panel gives you alerts before an expiry turns into an outage.

Name mismatches and incomplete chains

A certificate must cover every hostname you serve, including both www and the bare domain. Servers must also send the intermediate certificates; a missing chain may work in one browser and fail in another. Check with:

openssl s_client -connect example.com:443 -servername example.com </dev/null 2>/dev/null | openssl x509 -noout -subject -issuer -dates

Redirects and mixed content

• Redirect all HTTP URLs to HTTPS with one-step 301 redirects.
• Update internal links, canonical tags and sitemaps to HTTPS.
• Fix mixed content, meaning images, scripts or styles loaded over HTTP on HTTPS pages.
• Consider HSTS once everything works; our guide to HTTP Strict Transport Security covers safe rollout.

A CAA record can also limit which CAs may issue for your domain, reducing mis-issuance risk; see configuring CAA records.

Common myths about certificates and rankings

Certificate marketing has created a number of persistent misconceptions. Here are the ones site owners ask about most often.

“A paid certificate makes Google trust my site more”

Google evaluates whether a page is served over a valid HTTPS connection, not who issued the certificate or what it cost. Trust in the search quality sense comes from content, reputation and user experience, not from validation paperwork.

“The padlock means the site is safe”

The padlock only means the connection is encrypted and the certificate matches the domain. Phishing sites can and do use valid DV certificates. Chrome replaced the padlock with a more neutral icon partly to avoid this misunderstanding.

“Site seals improve conversions and SEO”

Some CAs offer trust seal images to place on your pages. Search engines do not use them as a ranking factor. Any effect on visitors is a design and marketing question, and claims about conversion uplift should be treated with caution unless you test them on your own site.

“Changing certificate type will cause a ranking drop”

Replacing one valid certificate with another on the same hostnames does not change your URLs, so search engines see no difference. Ranking problems only appear if the switch causes errors, such as a gap in coverage, a missing hostname or an incomplete chain.

Choosing the right certificate

• Choose DV for most websites. It is fast, free or inexpensive, and easy to automate, which reduces expiry risk.
• Choose OV when a policy, partner or procurement process requires organisation details in the certificate.
• Choose EV only when a regulatory, contractual or internal security requirement specifies it, knowing it will not change how browsers display your site or how Google ranks it.

Whichever you choose, the SEO priorities are the same: a valid certificate on every hostname, clean HTTPS redirects, no mixed content and renewals that never slip.