SSL vs TLS: What’s the Difference?

SSL vs TLS comes down to this: SSL (Secure Sockets Layer) is the original encryption protocol for the web, and TLS (Transport Layer Security) is its successor. Every SSL version is deprecated, so all secure websites now use TLS. The certificate you buy works with TLS, even though the industry still calls it an “SSL certificate.”

In other words, you are not choosing between two products. You are choosing one certificate, and your server decides which protocol version it speaks.

Key fact	Answer
SSL full form	Secure Sockets Layer
TLS full form	Transport Layer Security
Last SSL version	SSL 3.0 (1996), deprecated by RFC 7568 in 2015
Current protocol	TLS 1.3 (RFC 8446, 2018), with TLS 1.2 still widely used
Is an SSL certificate a TLS certificate?	Yes – same X.509 certificate, two names

SSL vs TLS: the key differences at a glance

SSL and TLS do the same job: they encrypt the connection between a browser and a server and prove the server’s identity with a certificate. TLS does it with stronger algorithms, a cleaner handshake (the opening exchange where both sides agree on keys) and fewer known weaknesses.

Aspect	SSL (2.0 / 3.0)	TLS (1.2 / 1.3)
Status (as of October 2026)	Deprecated, should be disabled	Current standard
Designed by	Netscape	IETF (Internet Engineering Task Force)
Handshake	Slower, multiple round trips	TLS 1.3 needs one round trip
Cipher suites	Includes broken ciphers (e.g. RC4, export-grade)	TLS 1.3 allows only modern AEAD ciphers
Known attacks	POODLE (2014), DROWN (2016)	No practical breaks of TLS 1.3 when configured correctly
Certificate used	X.509 certificate	Same X.509 certificate

Is SSL the same thing as TLS, and which one am I actually buying?

No, the protocols are not the same, but the certificate is. SSL is retired; when you buy an “SSL certificate” today, you get a certificate that your server uses for TLS connections.

The name survived because “SSL” was the brand everyone knew in the late 1990s. Certificate authorities (CAs, the companies that verify and issue certificates), hosts and resellers kept the term because that is what buyers search for. Some vendors say “SSL/TLS certificate” to cover both.

So the product labels “SSL certificate,” “TLS certificate,” “SSL/TLS certificate” and even the common misspelling “TSL/SSL certificate” all describe one thing. What differs between products is validation level, number of domains covered and brand – not the protocol.

SSL and TLS protocol timeline

Each version replaced the last after researchers found weaknesses. Here are the milestones with their defining documents.

1. 1995 – SSL 2.0: first public release by Netscape (SSL 1.0 was never released). Prohibited by RFC 6176 in 2011.
2. 1996 – SSL 3.0: redesign that fixed SSL 2.0 flaws. Broken by the POODLE attack in 2014 and deprecated by RFC 7568 in 2015.
3. 1999 – TLS 1.0 (RFC 2246): the IETF renames and standardizes the protocol as TLS.
4. 2006 – TLS 1.1 (RFC 4346): protects against certain cipher-block attacks.
5. 2008 – TLS 1.2 (RFC 5246): adds modern hashing and authenticated encryption; still widely supported.
6. 2018 – TLS 1.3 (RFC 8446): removes legacy options and shortens the handshake.
7. 2021 – RFC 8996: formally deprecates TLS 1.0 and TLS 1.1. Major browsers had already disabled them in 2020.

Tip: Your certificate does not set the protocol version. Your web server does. If your server still accepts SSL 3.0, TLS 1.0 or TLS 1.1, a new certificate will not fix that – you change the server’s protocol settings instead.

SSL vs TLS certificates: are they the same?

Yes. A TLS certificate and an SSL certificate are the same X.509 file, issued by the same CA, under the same rules from the CA/Browser Forum (the body of CAs and browser makers that sets certificate standards).

Does TLS use SSL certificates?

Yes. TLS uses exactly the certificates sold as “SSL certificates.” The certificate holds your public key, your domain name and the CA’s signature. Those fields have nothing protocol-specific in them, so the same certificate serves TLS 1.2 and TLS 1.3 connections without changes.

What is the difference between SSL and TLS certificates, then?

There is none in the file itself. The difference between SSL and TLS certificates is only in the label on the shop page. If you see two products whose only distinction is “SSL” vs “TLS” in the name, compare their validation level and coverage instead.

What are SSL and TLS certificates, explained in one paragraph?

SSL and TLS certificates are digital files that bind a domain name (and, for higher validation levels, an organization) to a public key, signed by a trusted CA. Browsers check that signature during the TLS handshake before they show the padlock. For the full picture of issuance and trust, read our guide to what an SSL certificate is.

What does “SSL certificate” stand for?

The SSL certificate full form is “Secure Sockets Layer certificate.” The matching modern term is “Transport Layer Security certificate,” but both expand to the same product.

Is TLS more secure than SSL?

Yes. TLS 1.2 and 1.3 close the attacks that broke SSL 2.0 and 3.0, so disabling SSL entirely is standard practice. Encryption strength also depends on your server settings and key size; we cover that separately in how secure SSL is.

Which certificate should you choose: SSL or TLS?

Pick the certificate by what it needs to cover, not by the protocol name. Every certificate in our catalog works with TLS 1.2 and TLS 1.3.

• One website: a single-domain certificate.
• All subdomains on one level: a wildcard certificate.
• Several different domains: a multi-domain (SAN) certificate.
• Verified company identity: an OV or EV certificate.

When you know what you need, you can buy SSL certificates from DigiCert, Sectigo, GeoTrust, Thawte and RapidSSL in one place. The certificate will work for TLS on any current server.