Inspect a live HTTPS certificate or paste PEM/CSR offline for subject, expiry, and fingerprint.
- Free
- No signup
- Fast
- Privacy-friendly
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SSL/TLS Certificate Checker
Or paste PEM / CSR for offline decode (used instead of URL when filled)
Waiting for bot check… this usually takes a second.
What next?
Keep going with SSL/TLS Certificate Checker
Finish this check in the browser, then pick the path that matches how you work — another related tool, REST for apps, or MCP for agents.
- 1. Related check
After this result, run DNS lookup for the next signal.
DNS lookup - 2. Automate with API
Same job from your server with
Create free accountX-Api-Key. Free tier includes 500 credits/month. - 3. Hand off to an agent
Connect MCP and run playbook ship-gate, then verify until pass.
ship gate
What is SSL/TLS Certificate Checker?
Check live TLS peer certificates or paste PEM/CSR for offline decode. Not a full SSL Labs grade. This check is part of ship-gate and full-security-audit playbooks — agents plan, run, and verify until certificate issues clear. See <a href="/developers/ship-gate">ship gate</a>. Related browser tools: DNS Lookup, HTTP Security Redirect Checker.
What are common questions about SSL/TLS Certificate Checker?
What does SSL/TLS Certificate Checker do?
Inspect a live HTTPS certificate or paste PEM/CSR offline for subject, expiry, and fingerprint.
Is this available via API and MCP?
Yes. Same route under /api/v1/security-apis/{slug} with one ToolYour API key.
What are the key features of SSL/TLS Certificate Checker?
Expiry countdown
Days remaining with warn under 30 days and fail when expired or under 14.
SAN and fingerprint
Subject alternative names and SHA-256 fingerprint for inventory and pinning notes.
How do you use SSL/TLS Certificate Checker?
Enter an https URL
Hostname is taken from the URL; custom ports are supported.
Review findings
Check expiry, issuer, and whether SANs match the host you expected.
Honest scope
Useful for renewal ops and quick host checks. Follow with your CA/ACME monitor and a periodic SSL Labs or similar deep scan for cipher policy.
Free · API · MCPToolYour platform
Use SSL/TLS Certificate Checker three ways
The free SSL/TLS Certificate Checker on this page works in your browser. The same workflow is available via REST API for apps and via the remote MCP server for Cursor, Claude, and other agents — one API key, one plan, one quota. This tool is part of the security-apis module under Security Tools.
Agents close the full job with run_playbook ship-gate, then verify until pass — see ship gate.
- 1Create a free accountGet an API key for REST and MCP — 500 credits/month on the free tier.
- 2Connect or callPaste the MCP URL into Cursor/Claude, or call REST with
X-Api-Key. - 3Same key & creditsBrowser smoke-checks stay free; API-backed runs share one monthly credit quota.
- Free in browserUse SSL/TLS Certificate Checker here — no account required.
- REST APICall from your server with
X-Api-Key. - Remote MCP serverSame job from Cursor or Claude via the ToolYour remote MCP server — one API key with REST.
Which transport & DNS tools sit in this cluster?
Where does this job fit on ToolYour?
Which SEO or privacy tools pair with this security check?
Where do you browse more security tools tools?
- Security Tools tools
Browse the full Security Tools category on ToolYour.
- Developer Tools tools
Format JSON, encode Base64/URL, mint UUIDs, convert timestamps, and test regex in the browser. REST and MCP sh
- Marketing Tools tools
Build UTM links, check ads copy limits, QA email subjects, and calculate ROAS/CPC/CTR — free in the browser; R
Which toolkits include SSL/TLS Certificate Checker?
- Security Toolkit
HTTP security headers, TLS, cookies, CORS, redirects, DNS, secrets, JWT, passwords, hashes, HMAC, bcrypt, security.txt, SRI, and email auth — plus agent playbooks for full audits and ship gates.
- Developer Toolkit
JSON/XML/SQL formatters, encoders, UUID/timestamp/regex, JSON codegen, JWT minting, HTTP headers, request builders, cron, minifiers, and color conversion — plus security and text peers.