PDF Sentinel

PDF Sentinel is a lightweight safety inspection library for PDF documents. It detects oversized, vector-heavy, or otherwise resource-intensive pages (like blueprints) that could slow down or crash OCR and pipelines.

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Features

• Detects dangerous or heavy PDF pages:

  • Large page dimensions (A0, engineering blueprints, etc.)
  • Massive embedded images
  • Vector-heavy drawings (architectural plans)
  • Pages that exceed safe rasterization thresholds

• Returns simplified or detailed analysis for pages and files

• Configurable limits (page size, pixel thresholds, etc.)

• Optional JSON response for easy API integration

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Installation

pip install PDFSentinel

This will install the library from PyPI and make it available to import in your project.

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Usage

Simplified file safety check

from pdfsentinel import PDFSentinel

sentinel = PDFSentinel()
result = sentinel.is_file_safe("samples/test.pdf")
print(result)

Output (Python dict):

{
    "file_name": "test.pdf",
    "pages": 23,
    "is_file_safety": true,
    "unsafety_pages": []
}

You can also get JSON-formatted output directly:

print(sentinel.is_file_safe("samples/test.pdf", json_response=True))

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Simplified page safety check

print(sentinel.is_page_safe("samples/test.pdf", 2, json_response=True))

Example output:

{
    "file_name": "test1.pdf",
    "page": 24,
    "is_page_safety": false,
    "errors": [
        "page_too_large:2592.0x1728.0",
        "too_many_vector_ops:33035",
        "raster_estimate_too_big:77760000"
    ]
}

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Full file analysis

print(sentinel.file_analysis("samples/test.pdf", json_response=True))

Output:

{
    "file_name": "test1.pdf",
    "pages": 2,
    "is_file_safety": true,
    "results": [
        {
            "page": 1,
            "is_page_safety": true,
            "errors": [],
            "page_width": 612.0,
            "page_height": 792.0,
            "max_image_pixels": 0,
            "max_vectors_operations": 58,
            "max_raster_pixels": 8415000
        },
        {
            "page": 2,
            "is_page_safety": false,
            "errors": [
                "page_too_large:2592.0x1728.0",
                "too_many_vector_ops:33035",
                "raster_estimate_too_big:77760000"
            ],
            "page_width": 2592.0,
            "page_height": 1728.0,
            "max_image_pixels": 354652,
            "max_vectors_operations": 33035,
            "max_raster_pixels": 77760000
        }
    ]
}

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Single page detailed analysis

print(sentinel.page_analysis("samples/test.pdf", 3, json_response=True))

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Configuration

You can override safety thresholds per call:

sentinel.is_file_safe(
    "samples/test.pdf",
    config={
        "max_page_size": 1800,
        "max_image_pixels": 10_000_000,
        "max_vectors_operations": 1000,
        "max_raster_pixels": 20_000_000
    }
)

Parameter	Default	Description
max_page_size	2000	Max page dimension in points
max_image_pixels	20,000,000	Max embedded image total pixels size (w × h)
max_vectors_operations	1500	Max allowed vector drawing operations
max_raster_pixels	30,000,000	Estimated max rasterization size (at 300 dpi)

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License

MIT License © 2025 — Not Empty Foundation