Can I use the PDF checker for legal documents?
Yes, you can run legal documents through HTPBE?, but the result is a technical statement about the file, not legal proof.
What the result can support
HTPBE? tells you whether a PDF was changed after it was generated. For legal documents that is useful when you receive a contract, agreement or court document by email and want to know whether the file in front of you was altered after it was created or after it was signed.
What it cannot support
- Content. HTPBE? does not read the text, so it cannot tell you whether a clause, a name or a date is the one that was agreed.
- Signature validity. It detects whether a digital signature is present, whether it was removed, and whether the file changed after signing. It does not test the signature certificate or the signer’s identity. Use a PDF reader or a trust service to validate a signature.
- Court-admissible authentication. The result does not replace a forensic expert or expert testimony.
Inconclusive is common for legal documents
Most contracts are drafted in office software. A PDF produced by software that anyone can use gets an Inconclusive verdict, because its structure can’t vouch for a file anyone could have produced from scratch. It does not mean the contract is false. Ask the counterparty for the signed original through a channel you control, or confirm the document with them directly.
Practical steps
- Keep the file exactly as you received it. Re-saving or printing to PDF creates a new file with a new history.
- Record the check ID and the date. The API result also returns the algorithm version. You can reopen the stored result later from the dashboard or through the API. If the detection software has been updated since, the result says so and recommends re-analysing.
- If a dispute is likely, talk to a lawyer about how a technical result fits your case, and consider a forensic examiner.
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3 answers
How Detection Works
Creator is the application that authored the document; Producer is the application that wrote the PDF file. They often differ, and that is normal. The pair shows what kind of software is behind a file.
An incremental update is how a PDF records a change by appending it to the end of the file instead of rewriting it, so one file can hold several versions. Signing, form filling and annotating also use it, so presence alone is not an accusation.
Privacy, Data & Limits
No. HTPBE? analyses the structure of the file – metadata, structure, signatures and embedded content – not what the document says. It does no OCR and cannot tell you whether amounts, names or dates inside are correct.