FREE · DEVELOPER TOOLS
X.509 Certificate Inspector.
Read certificate identity, dates, extensions and a SHA-256 fingerprint.
How to use X.509 Certificate Inspector
Enter your input, adjust settings and generate locally. Review the output before use.
How it works
Read certificate identity, dates, extensions and a SHA-256 fingerprint. One PEM certificate, 100,000 characters. No live server request, trust-chain, signature, hostname or revocation validation. Input remains in this browser page.
Example
Run the editable example to inspect the result.
Questions about X.509 Certificate Inspector
Is X.509 Certificate Inspector free, and do I need an account?
Yes. This tool is free to use in your browser without an account. Processing takes place on your device.
What are the limits and what should I check?
One PEM certificate, 100,000 characters. No live server request, trust-chain, signature, hostname or revocation validation. Review the result before using it in your work.
Is my input sent to a server?
Your input is processed in your browser and is not uploaded by this tool. Files and pasted text are cleared when the page is refreshed. Normal website requests are still required to load the page and its libraries. Read the privacy explanation.