An SSL certificate is a small digital file that proves your website\u2019s identity and enables an encrypted HTTPS connection between your site and your visitors. With one, data such as passwords, form entries and payment details travels privately instead of in plain text.<\/p>\n
Technically, today\u2019s connections use TLS (Transport Layer Security), the successor to SSL. The name \u201cSSL certificate\u201d stuck, so this guide uses it, and the certificate you buy or install works with TLS.<\/p>\n
A certificate does three things:<\/p>\n
Think of the difference between a postcard and a sealed, tamper-evident envelope. Without a certificate, anyone on the network path can read the postcard.<\/p>\n
You\u2019ll know a site uses one when the address starts with All of this happens in milliseconds, before the page loads.<\/p>\n All three use the same strength of encryption. The difference is how much identity checking sits behind the certificate. Browsers no longer show a green bar or company name for EV, so its value today is mostly in verification and compliance.<\/p>\n Without HTTPS, logins, contact forms and payments can be read or altered by anyone on the network between the visitor and your server. That includes public Wi-Fi.<\/p>\n Browsers warn visitors before they open HTTP pages and block or warn on expired or invalid certificates. Many visitors leave at that warning, and shoppers won\u2019t enter card details on a page marked \u201cNot secure\u201d.<\/p>\n Google uses HTTPS as a lightweight ranking signal. It won\u2019t rank a weak page, but it removes a handicap, and it prevents the browser warnings that hurt engagement.<\/p>\n Modern browser features, including HTTP\/2 and HTTP\/3, geolocation, service workers and many APIs, require HTTPS.<\/p>\n Laws and standards such as GDPR expect appropriate security for personal data, and PCI DSS requires strong cryptography for cardholder data in transit. A properly configured certificate is a standard part of meeting them.<\/p>\n Running your own server? See our guide on how to install SSL on a VPS<\/a>. To buy one, see AvenaCloud SSL certificates<\/a>.<\/p>\n Certificates expire, and lifetimes are getting shorter:<\/p>\nhttps:\/\/<\/code>. Browsers also show a lock-style indicator, and they warn visitors about HTTP pages as \u201cNot secure\u201d.<\/p>\nHow an SSL\/TLS certificate works<\/h2>\n
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Types of SSL certificates<\/h3>\n
By validation level<\/h4>\n
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\n \nType<\/th>\n What\u2019s verified<\/th>\n Best for<\/th>\n<\/tr>\n<\/thead>\n \n DV<\/strong> (Domain Validated)<\/td>\n Control of the domain only<\/td>\n Blogs, portfolios, most small sites<\/td>\n<\/tr>\n \n OV<\/strong> (Organization Validated)<\/td>\n Domain plus the organization\u2019s real identity<\/td>\n Business and company sites<\/td>\n<\/tr>\n \n EV<\/strong> (Extended Validation)<\/td>\n Strictest checks on the legal entity<\/td>\n Banks, enterprises, regulated industries<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n By coverage<\/h4>\n
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\n \nType<\/th>\n Covers<\/th>\n<\/tr>\n<\/thead>\n \n Single-domain<\/strong><\/td>\n One domain name (for example, example.com<\/code>)<\/td>\n<\/tr>\n\n Wildcard<\/strong><\/td>\n One domain and all its subdomains ( *.example.com<\/code>)<\/td>\n<\/tr>\n\n Multi-domain (SAN)<\/strong><\/td>\n Several different domains in one certificate<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n Why you need an SSL certificate<\/h2>\n
1. Security<\/h3>\n
2. Trust and conversions<\/h3>\n
3. SEO<\/h3>\n
4. Features and compatibility<\/h3>\n
5. Privacy and compliance<\/h3>\n
How to get an SSL certificate<\/h2>\n
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Renewal: shorter lifetimes in 2026<\/h2>\n
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\n \nIssued on or after<\/th>\n Maximum validity<\/th>\n<\/tr>\n<\/thead>\n \n March 15, 2026<\/td>\n 200 days<\/td>\n<\/tr>\n \n March 15, 2027<\/td>\n 100 days<\/td>\n<\/tr>\n \n March 15, 2029<\/td>\n 47 days<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n