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Works 100% offline — test in Airplane Mode
100% client-side Web Crypto & JavaScript. Zero server round-trips.
NETWORK ON
DEVELOPER UTILITY

SSL Certificate (PEM / CRT) Decoder

Inspect SSL/TLS certificates, X.509 ASN.1 metadata, Subject Alternative Names (SANs), Issuer, and expiration dates 100% offline without uploading keys.

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SSL Certificate (PEM / CRT) Decoder
100% IN-BROWSER
Paste PEM Certificate (CRT / CER)
Certificate Metadata & X.509 Fields 100% Offline

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Capture JSON, cURL, API secrets, and tokens with instant regex search, on-device AI classification, and 1-click smart transforms.

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📚 Recommended Research & Mac Clipboard Guides

📊 Mac Clipboard Benchmark (2026) 🏆 7 Best Mac Clipboard Managers 🔒 State of Clipboard Privacy ⚡ Developer Clipboard Guide

Frequently Asked Questions

Is this tool free with no limits?
Yes. Unlike competitors that cap rows or require subscriptions, this tool runs entirely in your browser with unlimited operations and zero paywalls.
Is my input data uploaded to any remote server?
No. All computations execute locally in JavaScript memory. Verify by running in Airplane Mode.

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