Click the padlock icon to display SSL Certificate information of the current tab.

What is CertViewer?
CertViewer is a Chrome extension that provides a quick and easy way to view SSL Certificate information of the current tab. It eliminates the hassle of multiple mouse clicks or using keyboard shortcuts to access this crucial information.
This extension was removed from Chrome Web Store on 2022-02-01
Users: 1,000+
Rating: 3.53 (15)
Version: 0.4.8 (Last updated: 2017-07-19)
Creation date: 2017-07-19
Risk impact: Moderate risk impact
Risk likelihood: High risk likelihood
Manifest version: 2
  • activeTab
  • webRequest
  • *://*.ip-show.com/
  • tabs
Size: 69.12K
Stats date:

Other platforms

Not available on Firefox
Not available on Edge
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Chrome doesn't have the ability to (easily) view the SSL Certificate and SSL information. It will either take 5 mouse clicks or 2 if you use Ctrl+Shift+i.

When you click the CertViewer Icon (padlock), it will display a popup that contains information about the site in your current tab.

How it works:

  1. Go to an HTTPS website (https://<hostname.domain>)
  2. Click the padlock icon in top right
  3. Popup will show up and display the SSL connection and PKI certificate information of that site.


  1. This makes an external connection to the site, so the site needs to be externally accessible and not have any access control policies.
  2. You do send your active tab URL to my server when you click the padlock. I don't do anything with the URL except make connections using tools such as openssl and curl.
  3. The site needs to have SSL enabled for this to work.
User reviews
Okay-ish - it's limited and slow, but that's because of Google's shielding of the required info, not due to the extension itself. That being said, the extension is no longer needed at all since you can have the original, native behaviour back if you enable chrome://flags/#show-cert-link .
by Lennert Van Alboom, 2017-10-17

Not sure how this extension can be as slow as it is. The reliance on a backend service means this is not useful for many of the people that would want simplified certificate inspection.
by Stephen Dayman Stephen Dayman, 2017-09-08

It's not perfect, but it's great to have this functionality back in Chrome. I have no idea what the devs were thinking when they removed native support for this function in Chrome v. 56, especially as security is becoming more important we should be able to quickly confirm the details of a SSL/TLS certificate.
by Jeremy Andrews Jeremy Andrews, 2017-07-10
View all user reviews
Risk impact

CertViewer may not be safe to use and it requires some risky permissions. Exercise caution when installing this extension. Review carefully before installing.

Risk likelihood

CertViewer may not be trust-worthy. Avoid installing if possible unless you really trust this publisher.

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