PDF Signature Checker

Inspect PDF AcroForm signature fields, ByteRange values, and available signer metadata.

Choose PDF

Select a local, unencrypted PDF up to 50 MiB.

Local inspection only

No cryptographic validation or trust check is performed.This tool inspects signature structures and declared metadata. It does not verify PKCS#7 integrity, document digests, certificate chains, revocation, timestamps, or signer trust.

Choose a PDF to inspect its AcroForm signature fields. The file is not uploaded.

About this tool

Made for the task at hand.

Inspect digital-signature structures in a local PDF with PDF.js. The report lists AcroForm signature fields, signed byte ranges, revision coverage, and available signature metadata without confusing a readable signer name or date with a verified identity.

How to use

Choose an unencrypted PDF that may contain AcroForm digital signatures.
Review each signature field, ByteRange, declared signer, and declared signing time.
Read the limitations: this inspector does not perform cryptographic signature, certificate-chain, revocation, or trust validation.

Your work stays yours.
Tool inputs are processed locally in your browser and are never sent to KitVerse servers. Clear the workspace when using a shared device.

Common questions

Does a listed signature mean the PDF signature is valid?

No. This tool only inspects structure and metadata. It does not verify the PKCS#7 signature, document digest, certificate chain, revocation status, or trust, so it never labels a signature cryptographically valid.

Is the displayed signing time independently verified?

No. A signing time or signer name extracted from the signature dictionary is declared metadata and may be absent or misleading. A validated signed timestamp and trusted certificate require separate cryptographic verification.

PDF Signature Checker

Made for the task at hand.

How to use

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