PDF Signature Checker
Inspect PDF documents client-side to detect digital signatures, validation certificate blocks, and ByteRange objects.
Select PDF File
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Drag and drop or click to upload PDFPDF files only. Processing is run 100% locally.
Frequently Asked Questions
How does the signature checker work?
It processes the file client-side. It parses the PDF structure binary buffer and looks for `/Sig` metadata tags which indicate electronic signatures.
Is my document uploaded to a server?
No. The inspection runs entirely inside your browser. No PDF file is sent across the network, guaranteeing document secrecy.