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Decode and verify SSL/TLS certificates online. Extract X.509 details including issuer, validity, SAN, and fingerprint. Fast, secure, and browser-based.

Which is more popular?
Based on our record, DNS66 should be more popular than Cert Decoder. It has been mentioned 10 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | github.com | certdecoder.com |
| Pricing | — | |
| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of DNS66 yet.
Cert Decoder is a free online tool that helps you decode X.509 SSL/TLS certificates in PEM format. It instantly shows important information like the issuer, expiry date, SAN entries, and fingerprint. All data is processed locally in your browser, so nothing is ever sent or stored elsewhere.
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of DNS66 yet.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
DNS66- Block commercials and banners from your whole device
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing DNS66 and Cert Decoder.
Cert Decoder's answer:
I built certdecoder.com over the weekend for my own needs. Sometimes in my work, I need to verify and check certificate details.
Cert Decoder's answer:
certdecoder.com was built using just JavaScript and HTML—simple, fast, and with all processing happening locally in your browser, so no certificate data is sent to any server
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Cert Decoder's answer:
Simple, fast, and reliable. Some similar tools can’t even decode basic certificates. I rigorously tested my tool with many real-world certificates and covered several edge cases where competitors fall short.
Cert Decoder's answer:
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
Share your experience with using DNS66 and Cert Decoder. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


DNS66 is a free and open-source Android Repository that allows blocking hostnames through domain name systems (DNS). This DND-based host blocker is an effective tool that instantly blocks all the ads, malware,...
We have no reviews of Cert Decoder yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


Also use DNS66 btw, it works great for adblocking Wattpad (find on GitHub, DNS66, Releases) https://github.com/julian-klode/dns66 and you don't have to pay premium. Source: over 3 years ago
Here's DNS66, it feels like an abandoned open source adblocker and only maintainers are the ones who update the Blocklist which are owned by other people: https://github.com/julian-klode/dns66. Source: over 3 years ago
This will block all the youtube ads on both browsers. If your toddler is watching on a phone, I would recommend newpipe or dns66 for android https://github.com/julian-klode/dns66 . Those aren't great, but they do. Firefox on android... Source: almost 4 years ago
Why? Because I built certdecoder.com and couldn’t find a decent place to submit it. So I said screw it — I’ll build my own. With blackjack and hookers. - Source: dev.to / over 1 year ago
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