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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, Reader Mode should be more popular than Cert Decoder. It has been mentioned 7 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | readermode.io | certdecoder.com |
| Pricing | — | |
| Platforms | — | |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Reader Mode 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
Reader Mode is recommended for avid readers, individuals with attention difficulties, accessibility needs (such as visual impairments or dyslexia), and anyone who prefers a clean, minimalist reading interface for online content.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
No Cert Decoder videos yet. You could help us improve this page by suggesting one.
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Reader Mode 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 Reader Mode 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.


I usually tend to use Reader mode in Safari or ReaderMode[1] in Google Chrome. In-fact, I have set Reader Mode as default for a few common website such as that of PG's. 1. https://readermode.io/. - Source: Hacker News / over 2 years ago
You can use reader mode on a computer too Https://readermode.io/. Source: over 3 years ago
You probably used a site called outline.com but unfortunately the website was recently discontinued. There are many chrome extensions for it, which many of them can be used on chrome for android, as well as the fact that the safari... 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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