SSL Certificate Expiry Checker
Instantly check when any domain's SSL certificate expires
About AxelBase SSL Checker
AxelBase SSL Checker is a 100% client-side, open-source, and completely free web tool designed to help developers, sysadmins, and website owners instantly verify the SSL/TLS certificate status of any public domain — without compromising privacy.
Built in 2025 using modern SvelteKit and deployed via GitHub Pages, this tool was created out of frustration with bloated, tracking-heavy alternatives. We believe privacy and performance should never be traded off.
Every single operation — from domain parsing to certificate lookup — happens entirely in your browser. No backend. No logs. No cookies. No data collection. Even the public API calls are routed through anonymized CORS proxies that we don’t control or monitor.
Whether you're checking your own sites, auditing a client’s infrastructure, or teaching web security concepts, AxelBase delivers accurate, real-time results in under two seconds.
This project is proudly MIT-licensed and hosted on GitHub. Contributions, forks, and improvements from the community are not just welcome — they’re encouraged.
Why We Built This
"An expired certificate shouldn’t cost anyone their reputation — or their revenue."
— The AxelBase Team • November 2025
How to Use AxelBase SSL Checker
Enter Any Domain or URL
Type a bare domain like github.com, or paste a full URL such as https://randomwordgenerator.com/color.php. Our smart parser extracts the correct hostname automatically.
Click “Check SSL Certificate”
The button only activates when a valid domain is detected. Once clicked, your browser securely queries public certificate data via a trusted CORS proxy — no server of ours ever sees your request.
Get Instant Results
Within seconds, you’ll see the certificate issuer, validity period, exact expiry date, days remaining, and a color-coded status badge: Valid (green), Expiring Soon (yellow), or Expired (red).
That’s it. No signup. No limits. No tracking.
Just paste → click → know.
Frequently Asked Questions
Is my data private and secure?
Yes — absolutely. Nothing you enter ever leaves your device except as an anonymized request to a public API. We don’t log, store, or track anything. No cookies. No analytics. Full details in our Privacy Policy.
Why do you use a CORS proxy?
The SSL API we use doesn’t send CORS headers, so browsers block direct requests. We route through a trusted public proxy that adds the necessary headers. It sees only the domain — never your IP or session.
Can I use this for internal/private domains?
No. This tool only works with publicly resolvable domains that have certificates exposed via standard TLS handshakes (port 443). Internal IPs, localhost, or self-signed certs cannot be checked.
Is there a rate limit or usage cap?
No official limit from us — but the public proxy and API may throttle excessive automated use. For personal and manual checks, you’ll never hit limits.
Can I contribute or run my own version?
Absolutely! The entire project is MIT-licensed on GitHub. Fork it, modify it, self-host it — it’s yours. Pull requests welcome!