Why would I need to check payment confirmations and receipts?
Payment confirmation fraud is a real problem in online transactions. When someone sends you a PDF screenshot or receipt as “proof of payment”, it could have been digitally edited to fake the transaction details.
Common fraud scenarios:
- Marketplace sellers: A buyer sends a fake payment confirmation to receive goods before actually paying
- Freelancers: A client shows an edited bank transfer screenshot claiming payment was sent
- Rental/accommodation: A tenant provides a modified payment receipt to avoid actual payment
- Online businesses: Customers submit altered invoices or receipts to claim refunds or discounts
- Peer-to-peer transactions: Someone shows fake payment proof to receive goods or services
How HTPBE? helps: By checking if the PDF has been modified, you can quickly identify suspicious payment confirmations. If a payment screenshot shows as “modified” in our analysis, it’s a red flag that the document may have been tampered with.
Important: Always check payment through your actual bank account or payment platform. HTPBE? is an additional fraud-detection tool, not a replacement for checking your real account balance.
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How accurate is PDF modification detection?
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3 answers
Our PDF modification detection system provides high accuracy through multi-layer analysis combining metadata validation, structural analysis, and signature verification. The accuracy depends on several factors: the quality of PDF metadata, the sophistication of modification attempts, and the PDF creation tools used.
Results come in three states: Intact (no signs of modification found), Modified (modification detected), and Cannot Determine (the PDF was created with consumer software such as Microsoft Word or LibreOffice — integrity analysis does not apply to documents created with these tools).
There is one fundamental limitation to understand: the tool detects post-creation modifications, not fabricated content. If someone creates a fake invoice or certificate from scratch in Word and exports it to PDF, that PDF will show as Intact — because it was never modified after creation. The check only tells you whether the file was changed after it was generated, not whether the data inside it is truthful. See Can someone create a fake document from scratch? for details.
For critical decisions, we recommend using this tool as part of a broader fraud-detection strategy rather than relying solely on automated results.
Our PDF authenticity checker accepts PDF files up to 10 megabytes (10 MB) in size. This limit ensures fast analysis and optimal performance for most common PDF documents including contracts, certificates, invoices, reports, and academic documents.
Files exceeding this limit will be rejected with an error message. If you need to check larger PDF files, consider splitting them into smaller documents or compressing the PDF before upload.
The 10 MB limit applies to the original file size before any processing. Our free PDF tamper detection service is designed to handle typical document sizes efficiently while maintaining quick response times and reliable analysis results for PDF modification detection.
HTPBE? analyzes four layers of evidence: metadata (creation and modification timestamps, creator/producer applications), file structure (incremental update sections, cross-reference tables), digital signatures (presence, validity, post-signature modifications), and embedded content (JavaScript, hidden file attachments).
What you see is one of three results: Intact (no modification detected), Modified (modification detected), or Cannot Determine (the PDF was created with consumer software such as Microsoft Word, LibreOffice, or a print-to-PDF driver). The detailed metadata and findings on the result page explain the reasoning behind each outcome.