PDF Signature Checker
Verify the authenticity and integrity of digital signatures within a PDF file.
Drag and drop a PDF file here, or click to select a file
How to Check a PDF Signature
Need to verify that a digital signature in a PDF is authentic and has not been tampered with? Here is how to check it.
Step 1: Upload Your Signed PDF
Drag and drop the signed PDF file into the upload area. The tool will analyze the document and find all digital signatures.
Step 2: View Signature Details
For each signature found, the tool shows you:
- Who signed the document
- When the signature was created
- Whether the signature is valid
- Whether the document has been modified since signing
Step 3: Review Certificate Information
You can view the full certificate details including the issuer, expiration date, and trust status.
Why Verify PDF Signatures
Digital signatures are used to ensure that a document came from the right person and has not been altered. Before you trust a signed contract, agreement, or official document, verifying the signature gives you confidence that everything is legitimate.
The entire verification happens in your browser. The signed PDF is not uploaded to any server.
Common Questions About PDF Signature Verification
What types of digital signatures can be verified?
The tool checks standard PDF digital signatures created with certificate based signing. These are commonly used in legal, financial, and government documents.
Can a valid signature be faked?
A valid digital signature that passes verification has strong cryptographic proof of authenticity. It is extremely difficult to forge. The tool checks the cryptographic chain to confirm the signature is genuine.
What does an invalid signature mean?
An invalid signature could mean the document was modified after signing, the signer's certificate has expired, or the certificate was revoked. The tool explains the reason for the failure.
Do I need any special software?
No. Everything runs in your browser. Upload the PDF and get the results instantly.
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