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

Dotenv
DataDrop
DropSpot
OnDrop
secure file sharing
Send Files Encrypted
View Once Link
Share .env files, API keys, and configs through password-protected, encrypted, expiring bundles. Client-side encryption. Zero-knowledge architecture.
Which is more popular?
Based on our record, Cert Decoder seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | certdecoder.com | secretdrop.dev |
| Pricing | ||
| Platforms | — | |
| Company | — | Startup from Germany · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


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.
SecretDrop is a zero-knowledge secret sharing tool for developers. Files are encrypted in the browser using AES-256-GCM before they ever reach the server. The server stores only encrypted blobs and can never read your content, filenames, or passwords. Upload files, set a password, share a link....
What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
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
How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Cert Decoder and SecretDrop.dev.
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.
SecretDrop.dev's answer:
Built by a dev agency founder in Germany who got tired of watching teammates share database credentials and API keys over Slack every week. Not because they didn't care about security — because there was no frictionless alternative. SecretDrop was built to fill that gap.
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
SecretDrop.dev's answer:
React 19, Vite 6, Tailwind CSS 4, and shadcn/ui on the frontend. NestJS 11 with TypeScript on the backend. Astro 5 for the landing page. Supabase for auth, database, and storage. Web Crypto API (AES-256-GCM, PBKDF2) for all encryption. Polar for billing.
Cert Decoder's answer
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
SecretDrop.dev's answer:
Developers, freelancers, and small dev teams who need to share API keys, .env files, and credentials quickly and securely without spinning up a Vault instance or paying for enterprise tooling.
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.
SecretDrop.dev's answer:
The real competitor is "paste it in Slack." Vault is heavy, enterprise tools are expensive and require setup. SecretDrop gives you zero-setup, encrypted-by-default sharing with a free tier — no accounts for recipients, no credit card, no infrastructure to manage.
Cert Decoder's answer
certdecoder.com is primarily built for developers, sysadmins, cybersecurity enthusiasts, and DevOps engineers.
SecretDrop.dev's answer:
SecretDrop is an early-stage product — there's no public customer list to share. It's built for and used by indie developers, freelancers, and small agencies.
SecretDrop.dev's answer:
True zero-knowledge encryption that happens entirely in the browser using only the Web Crypto API — no third-party crypto libraries, no server-side access to your data. It's as simple as upload, set password, share link — but with enterprise-grade cryptography underneath.
Share your experience with using Cert Decoder and SecretDrop.dev. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


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
Tracking SecretDrop.dev since Feb 2026.