SSL Certificate Checker

SSL Certificate Checker Check if a domain's SSL certificate is valid, when it expires, and who issued it. Useful for webmasters and developers monitoring HTTPS status and domain security. Quick Start

Enter a domain name (e.g., example.com) Click "Check SSL Certificate" Review the certificate status, issuer, and expiration date

Features Free Features

SSL Certificate Validation: Check if a domain's SSL certificate is valid and properly installed Expiration Monitoring: See when certificates expire and how many days remain Issuer Information: View who issued the certificate (Let's Encrypt, DigiCert, etc.) Certificate Details: Access comprehensive certificate metadata including serial number and signature algorithm Daily Limits: Check up to 10 domains per day for free

Pro Features ⭐

Bulk Processing: Upload a CSV file to check up to 500 domains at once Certificate History: Track certificate changes over time for monitored domains Export Results: Download results in CSV or JSON format Subject Alternative Names: View all domains covered by the certificate Extended Details: Access advanced certificate information Unlimited Checks: No daily limits on certificate checks API Access (Ultimate tier): Programmatic access via REST API

How to Use Single Domain Check

Navigate to the SSL Checker tool Enter the domain name in the input field (without https://)

Example: bulkcreator.com or www.example.com

Click the "Check SSL Certificate" button View the results showing:

Certificate validity status Expiration date and days remaining Issuer details Certificate serial number Subject information And more

Bulk Domain Check (Pro)

Prepare a CSV file with a column header named "domain" List one domain per row under the header Click the "Bulk" tab or navigate to bulk processing Upload your CSV file (drag and drop or click to select) Click "Process Domains" to check all certificates Review the summary statistics and detailed results Download results in CSV or JSON format

FAQ Q: What information does this tool provide? A: The SSL Checker provides certificate validity status, issuer details, expiration date, days remaining until expiry, serial number, signature algorithm, subject information, and subject alternative names (Pro). It helps you monitor HTTPS implementation and certificate health. Q: Can I check multiple domains at once? A: Yes! Pro users can upload a CSV file with up to 500 domains for bulk checking. Free users can check domains one at a time with a daily limit. Q: What does it mean if my certificate is invalid? A: An invalid certificate may indicate several issues: the certificate has expired, it's not properly installed, there's a trust chain problem, or the certificate doesn't match the domain. Check the error details for specific information. Q: Why would a certificate show as "Expiring Soon"? A: Certificates with fewer than 30 days remaining before expiration are marked as "Expiring Soon." This gives you time to renew before expiration causes service disruption. Q: What is a Subject Alternative Name (SAN)? A: Subject Alternative Names list all domains and subdomains covered by a single certificate. Modern SSL certificates often use SANs to protect multiple domains with one certificate. Q: How often should I check my SSL certificates? A: We recommend checking certificates at least monthly, or more frequently if they're close to expiration. Pro users can enable monitoring to track certificate changes automatically. Q: Can this tool detect certificate transparency issues? A: While this tool focuses on certificate validity and expiration, it provides the serial number and issuer information needed to look up certificates in Certificate Transparency logs. Q: What's the difference between the issuer and subject? A: The subject is the domain or organization the certificate was issued TO. The issuer is the Certificate Authority (CA) that created and signed the certificate. Examples Example 1: Check a Standard Website Input:

Domain: google.com

Expected Output:

Status: Valid Valid Until: [Date approximately 90 days in future] Issuer: GTS CA 1D4 (Google Trust Services) Days Remaining: ~90 Subject: google.com SANs: google.com, *.google.com

Example 2: Check an Expired Certificate Input:

Domain: expired.badssl.com

Expected Output:

Status: Expired Valid Until: [Past date] Days Remaining: Negative value Status Message: Certificate has expired

Example 3: Bulk CSV Format (Pro) Create a CSV file named domains.csv: csvdomain google.com github.com stackoverflow.com cloudflare.com Upload this file for bulk processing to check all domains at once. Troubleshooting "Failed to connect" Error

Verify the domain is accessible from the internet Check that the domain uses HTTPS (port 443) Ensure there are no firewall rules blocking the connection Try adding or removing www. from the domain

"Could not retrieve certificate" Error

The domain may not have SSL/TLS enabled The server might not be responding on port 443 There could be a network connectivity issue Check if the domain is correctly spelled

"Invalid domain name" Error

Remove http:// or https:// from the domain Remove any path components (e.g., /page) Ensure the domain format is correct (e.g., example.com)

Daily Limit Reached

Wait 24 hours for the limit to reset Upgrade to a Pro plan for unlimited checks Sign in to access higher limits

CSV Upload Issues

Ensure the file is in CSV format (not Excel) Verify the header row contains "domain" Check that domains are properly formatted Remove any empty rows Ensure file size is under the upload limit

CSV Format for Bulk Processing (Pro) Your CSV file must have a header row with a "domain" column: csvdomain example.com another-site.com third-domain.org Important Notes:

Do not include http:// or https:// in domain names Remove any path components Maximum 500 domains per file (Pro users) Maximum 10 domains per file (Free users with bulk access) One domain per row Ensure proper CSV encoding (UTF-8 recommended)

Pro Benefits Summary Upgrade to Pro for:

✅ Bulk processing up to 500 domains ✅ Unlimited daily checks ✅ Certificate history tracking ✅ CSV and JSON exports ✅ Subject Alternative Names ✅ Extended certificate details ✅ Priority support ✅ API access (Ultimate tier)

Need help? Contact support or check our FAQ section for more information.