zeerotrust · signature inspector
See exactly who signed this PDF — and whether it still holds up.
Drop in a digitally signed PDF. This reads the embedded certificate chain, checks the cryptographic signature, and flags anything added after signing. Nothing leaves your browser.
Drop a signed PDF here, or click to choose one
.pdf · processed locally, never uploaded
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All parsing happens in your browser. The file is read with the local File API and never sent to a server — you can verify this in your browser’s network tab.