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HTPBE?

Structural PDF tamper detection API. Catches edits your KYC stack misses.

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Status

Algorithm v2.43.1

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FAQ

How can I share PDF analysis results with others?

Each PDF authenticity check generates a unique, permanent URL that you can share with others to view the analysis results. After uploading your PDF and completing the PDF tamper detection, you'll receive a results page with a shareable link (format: htpbe.tech/result/[unique-id]).

This link provides full access to the analysis including modification status, metadata details, and all findings. You can share this link via email, messaging apps, or embed it in documents. The results page includes social sharing buttons for easy distribution.

Recipients don’t need accounts or special access—the link works for anyone. This makes it easy to share PDF modification detection results with colleagues, clients, or legal professionals.

Note: The shared link shows analysis results only, not the original PDF file, maintaining privacy while enabling collaboration on PDF authenticity analysis.

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What PDF formats and versions are supported?

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What happens to my uploaded PDF file after analysis?

Related questions

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3 answers

Reading Your ResultsPrivacy, Data & Limits

Reading Your Results

Why does my PDF show as modified even though I didn't edit it?

A PDF showing as “modified” doesn’t necessarily mean someone tampered with the content. Many legitimate actions create modifications that our PDF authenticity checker detects:

  • Saving or exporting: Re-saving a PDF in any tool (even without changes) updates the modification date and metadata
  • Format conversion: Converting from Word/Excel to PDF, or PDF to PDF/A, creates new metadata
  • Adding signatures: Digitally signing a PDF creates incremental updates
  • Printing to PDF: “Printing” a PDF to create a new PDF changes all metadata
  • Auto-save features: Some PDF viewers auto-save which triggers modification timestamps
  • Annotation or comments: Adding notes, highlights, or comments modifies the file structure

Our system detects any structural changes after the PDF was originally created. This is intentional—it helps you know the document’s complete history. A “modified” result doesn’t automatically mean fraud or tampering; it means the file has a history beyond its initial creation.

Review the detailed findings on the results page to understand what specific changes were detected and whether they align with your document’s known history.

Privacy, Data & Limits

What happens to my uploaded PDF file after analysis?

It depends on how you submit the file. Files uploaded through the free web tool are stored in encrypted cloud storage (Cloudflare R2, hosted in the European Union) and may be retained after analysis and used, in anonymized and aggregated form, to test and improve our detection algorithm. Before a file is used for this purpose it is dissociated from your identity and any contact details. Files submitted through our public API are never stored — an API submission is fetched, analyzed once, and discarded.

What we keep for every check: the analysis results and metadata — filename, file size, creation and modification dates, creator, producer, and detected findings. Those results stay at your unique result URL so you can reference them later.

In every case our analysis is strictly structural: we examine the file’s technical layout, never the substantive content of your document, so the text of sensitive contracts, financial statements, and personal records is never read.

How long are analysis results stored?

Analysis results are stored permanently in our database. Once you upload and analyze a PDF, the results remain accessible indefinitely at the unique URL (htpbe.tech/result/[unique-id]).

This permanent storage has several benefits:

  • You can reference analysis results months or years later for audits or legal proceedings
  • Shared links remain valid indefinitely, ensuring recipients can always view results
  • Historical analysis can be compared if you check the same document multiple times

What is stored permanently: Analysis metadata, modification verdict, creation/modification dates, creator/producer information, structural findings, and detection results.

What about the original file? As stated in our privacy policy, files uploaded through the free web tool may be retained in anonymized form and used to improve our detection algorithm; files submitted through the public API are never stored. In neither case is the substantive content of your document read — analysis is limited to the file’s technical structure.

This approach ensures you have long-term access to detection results while keeping the analysis strictly structural.

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