Verify PDF Signature
Scans a PDF for signature form fields and produces a plain-text report listing them, along with the page count and document information such as title, author, producer and creation and modification dates. It does not validate certificates or check whether the document was changed after signing.
Drop your files here
or click to browse files
Up to 1 files
Verify PDF digital signature:
- Check for digital signature fields
- View document metadata
- Analyze creation and modification dates
- Generate verification report
Note: Full cryptographic signature verification requires Adobe Acrobat or similar software.
How to Use
- 1Drop one PDF onto the upload area.
- 2Click the Verify Signature button.
- 3Download the report; it is a .txt file named after your PDF with -signature-report added.
- 4Open the report and read the Signature Analysis section, then take any signed document to Adobe Acrobat or similar software for real validation.
Features
- Accepts one PDF per run (maxFiles is 1), up to 200 MB.
- Counts signature form fields (the AcroForm signature type) and lists their names.
- Report includes file name, size in KB, page count, title, author, subject, creator, producer, and creation and modification dates.
- Output is always a .txt report, never a modified PDF.
- Does not validate certificates, byte ranges or document integrity.
- Runs in your browser; the file is not uploaded.
FAQ
Does this tell me whether a signature is valid?
No. It only looks for signature form fields and reports what it finds. It does not check certificates, trust chains, ByteRange coverage or whether the document was modified after signing. The report itself says that full verification needs Adobe Acrobat or similar software.
What does the report contain?
A plain-text file with the file name, size, page count, the document information fields (title, author, subject, creator, producer, created and modified dates), the number of signature fields found and their names.
What if the report says no signatures were found?
That only means no signature form fields were detected. A PDF that has a visible typed or image signature stamped on the page, for example one made with Sign PDF, has no signature field and will show none.
Is my PDF uploaded?
No. The check runs in your browser with pdf-lib and the file is not sent to a server.