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Security and networkingRuns in your browser

SSL Certificate Checker

Enter a hostname to inspect the certificate through a single TLS handshake and get clear renewal signals.

  • expiry
  • SAN
  • hostname match
Online tool

Try the tool

Add your data, choose the settings, and get the result.

Hostname

Your data stays here

Text and selected files are processed in the current browser and are not sent to a server to produce the result.

Reviewed: 2026-07-17
01

How to use it

  1. 1

    Enter a hostname without https:// or path.

  2. 2

    Run the SSL check.

  3. 3

    Review expiry, issuer, SAN, and hostname match.

02

What the tool can do

  • Checks certificate validity and days until expiry.
  • Shows issuer, subject CN, and SAN coverage.
  • Rejects URLs, IP literals, and local/private targets.
03

Common use cases

  • Check whether a site certificate is close to expiry.
  • Find hostname mismatch after CDN or reverse-proxy setup.
  • Prepare a domain for SSL-expiry monitoring.
04

How it works inside

The tool connects to a public hostname with SNI and does not accept IP literals.

The result is not a legal security assessment of the site.

05

Questions and answers

Does this replace SSL Labs?

No. This is a fast embedded certificate check; deep TLS audit is a separate layer.

Can I check localhost?

No. The public tool accepts only public hostnames.