How to Check If Your SSL Certificate Is Valid (Free Tool)

An expired SSL certificate is one of the fastest ways to kill your website's traffic. Google marks sites with invalid certificates as "Not Secure," visitors see a scary browser warning, and your search rankings can drop within days.

The good news: checking your SSL certificate takes about 10 seconds and costs nothing.

How to Check Your SSL Certificate in 3 Steps

1. Open the SSL Checker tool below and enter your domain name (e.g. example.com).
2. Click "Check SSL" — the tool queries the certificate transparency log database and returns your cert's issuer, valid-from date, expiry date, and days remaining.
3. Review the results. If expiry is within 30 days, renew now. If it's already expired, act immediately.

What the Results Mean

✅ Valid (30+ days remaining)

Your certificate is healthy. Make a note to check again closer to expiry, or set up auto-renewal alerts with your hosting provider.

⚠️ Expiring Soon (under 30 days)

Renew now. Most CAs allow renewal up to 90 days before expiry without losing remaining time. Don't wait until the last week.

❌ Expired

Your site is actively showing security warnings to every visitor. Renew immediately. If you're on Let's Encrypt, run certbot renew --force-renewal. On shared hosting, check your control panel for SSL renewal options.

How SSL Certificates Affect SEO

Google has used HTTPS as a ranking signal since 2014. But it's not just about having HTTPS — an invalid or expired certificate causes browsers to block access entirely, which sends your bounce rate to 100% and signals to Google that your site is not trustworthy.

• Google Search Console will flag certificate errors as coverage issues
• Your page may be deindexed if Google's crawlers can't access it
• Core Web Vitals data stops flowing once visitors can't reach the page

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