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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, Rocket seems to be a lot more popular than Cert Decoder. While we know about 25 links to Rocket, we've tracked only 1 mention of Cert Decoder.
Website, pricing, platforms and company facts side by side.
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| Website | matthewpalmer.net | certdecoder.com |
| Pricing | — | |
| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Rocket 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.


Overall verdict
Why this product is good
Recommended for
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Rocket 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 Rocket and Cert Decoder. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


The emoji picker on macOS isn't that great, but Rocket makes it so easy to add emojis. I can't tell you how many times a day I use this. - Source: dev.to / over 2 years ago
In no particular order: Prologue [0] - iOS Audiobook player, used Plex as a media source Overcast [1] - iOS Podcast player CleanShotX [2] - macOS screenshot/video/gif capture with annotation Drafts [3] - iOS/macOS note taking tool... - Source: Hacker News / over 2 years ago
Since I discovered this, I’ve been making major use out of the feature. I add emojis into way more of my messages, blog posts, and other written works than I ever imagined I would. I actually got so accustomed to this means of adding... - Source: dev.to / over 2 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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