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JWK Inspector

Inspect a public JWK locally and compute its RFC 7638 SHA-256 thumbprint without verifying any signature.

How it works

Choose at least two PDFs in the required order.
Check the available options, then select “Run tool”.
Open and check the downloaded file before using it.

Related tools

Inspect JWT

Decode the header and claims of a three-part JWT without sending it anywhere.

Text encoding detector

Inspect a text file for BOM evidence, UTF-8 validity and bounded UTF-16 null-byte patterns without pretending to know the original encoding.

JSON-LD Structure Validator

Check JSON-LD syntax and core @context/@type structure locally without fetching remote contexts.