Free Tools

Free online SSL tools

Diagnose certificate problems, generate what you need to buy one, and stay ahead of expiry. All free, all in your browser — no sign-up, no data stored.

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Check & Verify

Diagnose certificate problems before your users hit them. Spot expired certs, broken chains, and email auth issues.

🔒 SSL Certificate Checker Type any domain to see who issued the certificate, when it expires, and which TLS protocol it uses.
🔗 CA Chain Checker If browsers show "not trusted", a missing intermediate is usually why. This tool finds the gap.
🧩 SSL Certificate Decoder Paste a PEM certificate or CSR and read what's inside — subject, SANs, validity, serial, algorithm.
📧 Email Auth Checker Emails landing in spam? Verify whether SPF, DKIM, and DMARC are correctly set up on your domain.

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Generate & Convert

Get the files you need before buying a certificate, and verify everything matches up before you install it.

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Manage & Monitor

Keep your certificates running. A free reminder so an expired cert never takes your site offline.

⏰ SSL Expiry Reminder Drop in your email; we'll remind you before your certificate expires — so an unnoticed expiry doesn't take your site down.

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How to use the online SSL tools

Choose a tool — Select the tool that matches your task: check a live certificate, generate a CSR, decode a PEM file, verify your chain, or set up expiry reminders.
Enter your data — Most tools work with just a domain name or a pasted PEM block. No account or software installation needed.
Read the results — Results are shown instantly with clear pass / fail indicators and plain-English explanations.
Act on the findings — If a check fails, each result links to the relevant solution — whether that's a new certificate, a chain fix, or a DNS record update.

Common questions about SSL tools

Are these tools free?

Yes, all tools on this page are completely free with no registration required. They run in your browser or call publicly available DNS and certificate APIs.

Is my certificate data safe?

Tools that accept certificate input (the decoder, the chain matcher, the key/CSR/cert matcher) run entirely in your browser. Your certificate content and private keys are never uploaded to a server.

Which tool should I use to diagnose an SSL error?

Start with the SSL Certificate Checker for live domains. If the certificate looks valid but browsers still warn, run the CA Chain Matcher to check for missing intermediates. For installation problems, use the Key-CSR-Cert Matcher.