Free SSL Certificate Checker

SSL certificates keep websites secure by encrypting connections and verifying id...

SecureFastFree

Updated

Quick check:

SSL Grade Reference

A+
Excellent
A
Very Good
B
Good
C
Fair
D
Poor
F
Critical
SSL Secured
256-bit Encryption
Cloud Processing
Mobile Friendly

What's Analyzed

Security Grade - A+ to F rating at a glance
Days Remaining - Expiration countdown
Chain Validation - Full certificate chain
HSTS Detection - Check security headers
TLS Version - Protocol verification
Cipher Analysis - Encryption strength

Why Use Free SSL Certificate Checker?

Complete Security Analysis

Get a full breakdown of certificate details, TLS protocol version, cipher strength, HSTS status, and an overall security grade from A+ to F.

Expiration Monitoring

See exactly when your certificate expires and how many days remain. Catch expiring certificates before they cause browser warnings and lost visitors.

Certificate Chain Verification

View the complete certificate chain from your site to the root CA. Identify missing intermediate certificates that cause trust issues.

Instant Results

No waiting around - get complete SSL information in seconds. We connect directly to your domain and retrieve live certificate data.

Works with Any Domain

Check any website's SSL certificate - your own sites, competitor sites, or any domain you're curious about. Subdomains work too.

No Account Required

Just enter a domain and check. No signup, no email, no limits. Use it as often as you need to monitor your certificates.

Who Uses SSL Checkers

Website Owners

Monitor your SSL certificates to avoid embarrassing expiration warnings. Set a reminder to check monthly or before your renewal date.

DevOps & SysAdmins

Verify certificate installations after deployment. Check TLS configuration, confirm the certificate chain is complete, troubleshoot HTTPS issues.

SEO Professionals

Ensure client sites have valid SSL - it's a Google ranking factor. Check competitor security configurations. Verify before site migrations.

Security Auditors

Assess website security posture as part of audits. Document certificate details, identify weak configurations, verify compliance requirements.

How It Works

1

Enter Your Domain

Type the domain you want to check. You can include https:// or just enter the domain name - we handle the formatting. Works with subdomains like mail.example.com too.

2

Check the Certificate

Click the button and we'll connect to your domain over HTTPS, retrieve the certificate, and analyze its configuration. Takes just a few seconds.

3

Review Your Results

See your security grade, certificate details, expiration date, issuer info, TLS version, and any issues. Expand sections to see the full certificate chain and all alternative names.

SSL Best Practices

Set Up Automatic Renewal

If you're using Let's Encrypt, set up certbot or your hosting panel to renew automatically. Most hosting providers do this by default. Manual renewals are easy to forget, and an expired certificate means browser warnings and lost traffic.

Don't Forget Intermediate Certificates

If your certificate works in some browsers but not others, you're probably missing intermediate certificates. Your CA provides these - install them alongside your site certificate. Without them, some clients can't verify the trust chain.

Test After Any Server Changes

After updating server software, changing hosting, or modifying web server config, check your SSL again. Configuration changes can accidentally disable TLS, enable weak ciphers, or break the certificate chain.

Enable HSTS After Testing

HSTS improves security but locks you into HTTPS. Test your site thoroughly, ensure SSL works on all subdomains, then enable HSTS with a short max-age first. Increase the duration after confirming everything works.

Frequently Asked Questions

An SSL certificate encrypts the connection between your website and visitors' browsers. Without one, data travels in plain text - passwords, credit cards, everything readable by anyone between the user and your server. Browsers now show 'Not Secure' warnings for sites without SSL, Google uses HTTPS as a ranking factor, and many features (like geolocation APIs) require HTTPS. For any modern website, SSL isn't optional - it's essential.
We grade certificates from A+ to F based on security strength. A+ means excellent - modern TLS 1.3, strong ciphers, valid certificate, HSTS enabled. A is very good with TLS 1.2 and no major issues. B means acceptable but with room for improvement. C and D indicate problems like weak ciphers or approaching expiration. F means critical issues - expired certificate, wrong domain, or broken trust chain. Aim for A or higher.
DV (Domain Validated) certificates only verify you control the domain - they're quick to get and usually free. OV (Organization Validated) certificates also verify your organization exists, taking a few days. EV (Extended Validation) requires extensive verification and traditionally showed the company name in the browser bar (most browsers no longer do this). All three provide the same encryption - the difference is identity verification level. DV is fine for most sites; EV is overkill for most use cases.
Renew it before expiration - ideally 2-4 weeks early. If you're using Let's Encrypt with automatic renewal, check that the renewal process is working (cron job, certbot timer, etc.). For paid certificates, your CA will email renewal reminders. After renewal, install the new certificate on your server and test. If you're using a hosting provider, they usually handle renewal automatically.
TLS (Transport Layer Security) is the protocol that encrypts HTTPS connections - it replaced the older SSL protocol years ago (we still call them SSL certificates by habit). You should support TLS 1.2 at minimum. TLS 1.3 is better - it's faster and more secure. TLS 1.0 and 1.1 are deprecated and insecure; most browsers no longer support them. Check your server configuration if you're still on old TLS versions.
HSTS (HTTP Strict Transport Security) tells browsers to only connect to your site over HTTPS, even if someone types http:// or follows an HTTP link. This prevents downgrade attacks where attackers intercept the initial HTTP request before the redirect to HTTPS. You should enable HSTS, but be careful - once browsers cache the HSTS policy, they won't connect over HTTP at all. Make sure your HTTPS works perfectly before enabling.
SANs are additional domain names covered by a single certificate. A certificate for example.com might also include www.example.com, mail.example.com, and api.example.com in its SANs. This is more efficient than having separate certificates for each subdomain. Our checker shows all SANs so you can verify your certificate covers all the domains you need.
Common reasons: The certificate expired (check the expiration date). The domain doesn't match (certificate for www.example.com used on example.com without SAN). The certificate chain is incomplete (missing intermediate certificates). The certificate was revoked. The certificate is self-signed and not trusted by browsers. The clock on the server or your computer is wrong. Our checker tells you which issue it found.
Browsers only trust certificates issued by Certificate Authorities (CAs) they recognize. Your certificate is signed by an intermediate CA, which is signed by a root CA that browsers trust. This chain of trust must be complete - if your server doesn't send the intermediate certificate, some browsers can't verify the chain and show security warnings. Our checker validates the complete chain.
Yes. Enter the full subdomain (mail.example.com, api.example.com, etc.) to check its specific certificate. Subdomains might have the same certificate as the main domain (if covered by SANs or a wildcard), or they might have their own separate certificates. Check each subdomain you're concerned about.
You want strong, modern cipher suites. Good examples: TLS_AES_256_GCM_SHA384, TLS_CHACHA20_POLY1305_SHA256, ECDHE-RSA-AES256-GCM-SHA384. Avoid anything with DES, RC4, MD5, or export ciphers. If your server supports old ciphers, attackers can sometimes force a downgrade. Our checker shows what cipher was used for the connection.
Yes, completely free with no limits. Check as many domains as you want, as often as you want. No signup required, no premium tier. We built this to help people keep their sites secure.

Related Tools

DNS Lookup

Query DNS records for any domain

WHOIS Lookup

Find domain registration details

HTTP Headers

Check HTTP response headers

Website Screenshot

Capture website screenshots