# PDFCheck - Full Technical Documentation

## Overview

PDFCheck (https://pdf.businesspress.io) is a comprehensive PDF analysis platform that verifies document authenticity, extracts metadata, detects AI-generated content, and optimizes file size. Users get 50 free analyses per day with a registered account.

## Core Tools

### 1. PDF Metadata Checker
**URL**: https://pdf.businesspress.io/

Extracts and analyzes standard and custom PDF metadata fields:
- **Creation & Modification Dates**: Verifies if internal timestamps match claimed timeline
- **Software Identification**: Detects specific software (Producer/Creator) used to generate the PDF
- **Author Information**: Extracts author names and contributor details
- **PDF Version**: Identifies PDF specification version (1.4, 1.7, 2.0)
- **Edit History**: Detects incremental updates and modifications
- **File Structure**: Analyzes linearization, page count, and layout

### 2. PDF Validator
**URL**: https://pdf.businesspress.io/pdf-validator

Validates PDF structure and integrity:
- **Corruption Detection**: Identifies damaged or malformed PDFs
- **Structure Validation**: Verifies PDF specification compliance
- **PDF/A Compliance**: Checks archival format standards
- **Reference Integrity**: Validates cross-references and object streams

### 3. AI Content Detector
**URL**: https://pdf.businesspress.io/pdf-ai-detection

Detects AI-generated PDF signatures:
- **LLM Tool Detection**: Identifies PDFs created by ChatGPT, Claude, and other AI systems
- **Software Fingerprinting**: Detects ReportLab, PyPDF, WeasyPrint, pdf-lib, PDFKit, Puppeteer
- **Pattern Recognition**: Analyzes metadata patterns typical of AI generation
- **Confidence Scoring**: Provides likelihood assessment of AI involvement

### 4. PDF Optimizer
**URL**: https://pdf.businesspress.io/optimize-pdf

Compresses and reduces PDF file size:
- **Screen (72dpi)**: Maximum compression for web viewing
- **eBook (150dpi)**: Balanced quality and size
- **Printer (300dpi)**: Minimal compression for printing
- **Prepress (300dpi)**: High quality for professional printing

### 5. PDF Signature Checker
**URL**: https://pdf.businesspress.io/pdf-signature-checker

Verifies digital signatures and certificates in PDF documents:
- **Signature Detection**: Identifies all digital signatures in a PDF
- **Certificate Analysis**: Extracts signer name, organization, and certificate details
- **Integrity Verification**: Checks if the document has been modified after signing
- **Timestamp Validation**: Verifies signing timestamps and certificate validity
- **Trust Chain**: Analyzes certificate authority and trust chain

### 6. PDF Image Extractor
**URL**: https://pdf.businesspress.io/extract-images

Extracts all images from PDF documents:
- **Full Extraction**: Extracts every embedded image from all pages
- **Original Quality**: Preserves original image resolution and format
- **Batch Download**: Download all extracted images as a ZIP archive
- **Format Support**: Handles JPEG, PNG, TIFF, and other embedded image formats
- **Preview Gallery**: Visual preview of all extracted images before download

### 7. PDF Accessibility Checker
**URL**: https://pdf.businesspress.io/pdf-accessibility-checker

Checks PDF accessibility compliance and structure:
- **Tagged PDF Detection**: Verifies if the PDF has proper tag structure for screen readers
- **Document Title**: Checks for a meaningful document title in metadata
- **Language Declaration**: Validates that the document language is specified
- **Text Content**: Confirms the PDF contains extractable text (not image-only)
- **Bookmarks/Navigation**: Checks for document outline and navigation aids
- **Accessibility Score**: Provides an overall score (0-5) with actionable recommendations

### 8. PDF Form Filler
**URL**: https://pdf.businesspress.io/fill-pdf-form

Fill in interactive PDF form fields online. Upload a PDF with form fields, fill them in via the browser, and download the completed document.

### 9. PDF Form Builder
**URL**: https://pdf.businesspress.io/build-pdf-form

Add fillable form fields (text inputs, checkboxes, dropdowns) to any PDF document. Upload a PDF, visually place form fields, and export as an interactive fillable PDF.

### 10. PDF Editor
**URL**: https://pdf.businesspress.io/edit-pdf

Edit PDF text, images, and annotations online. Upload a PDF, make edits directly in the browser, and download the modified document.

## REST API

### Authentication
Register at https://pdf.businesspress.io/register to create API tokens. Include token in Authorization header:
```
Authorization: Bearer YOUR_API_TOKEN
```

### Endpoints

#### Analyze PDF
```
POST /api/v1/pdf/analyze
Content-Type: multipart/form-data

Parameters:
- file: PDF file (required, max 100MB)
- is_public: boolean (optional, default false)

Response: JSON with metadata, software info, timestamps, share_token
```

#### Get Analysis Results
```
GET /api/v1/pdf/{id}

Response: JSON with full analysis data
```

#### Get User Info
```
GET /api/v1/user

Response: JSON with usage stats, remaining quota
```

### Rate Limits
- Registered users: 50 analyses per day
- Anonymous users: 100 analyses per day (via web interface only)

## Privacy & Security

- **Secure Processing**: Files processed in memory, not permanently stored
- **HTTPS**: All data transferred via encrypted connection
- **Data Retention**: Analysis results retained 30 days, then deleted
- **Shareable Links**: Results can be shared via unique tokens

## Tools Directory

Comprehensive database of PDF software signatures:
**URL**: https://pdf.businesspress.io/pdf-tools

Categories include:
- PDF Editors (Adobe Acrobat, Foxit, Nitro)
- Office Suites (Microsoft Office, LibreOffice, Google Docs)
- Design Tools (Canva, Figma, Adobe Creative Suite)
- Programming Libraries (iText, PDFBox, ReportLab, pdf-lib)
- AI/LLM Tools (ChatGPT exports, Claude artifacts, etc.)

## Resources

- **How It Works**: https://pdf.businesspress.io/how-it-works
- **API Documentation**: https://pdf.businesspress.io/api-docs
- **MCP Server**: https://pdf.businesspress.io/mcp-server
- **AI Agents Guide**: https://pdf.businesspress.io/ai-agents
- **Sitemap**: https://pdf.businesspress.io/sitemap
- **About**: https://pdf.businesspress.io/about
- **Privacy Policy**: https://pdf.businesspress.io/privacy

## AI Agent Integration

### MCP Server (Recommended)
Endpoint: https://pdf.businesspress.io/api/mcp (Streamable HTTP — no downloads needed)
Compatible with: Claude Desktop, GitHub Copilot, Cursor, Windsurf, and any MCP client.

Config (add to your AI tool):
```json
{
  "mcpServers": {
    "pdfcheck": {
      "url": "https://pdf.businesspress.io/api/mcp"
    }
  }
}
```

Available MCP tools: analyze_pdf, get_analysis, list_analyses, check_usage

### REST API
Base URL: https://pdf.businesspress.io/api/v1
- POST /pdf/analyze — Upload and analyze a PDF (multipart/form-data)
- GET /pdf/{token} — Retrieve analysis results
- GET /pdf — List all analyses
- GET /user — Check usage quota

### CLI Tool
Wrap the API in a bash function:
```bash
pdfcheck() {
  curl -s -X POST "https://pdf.businesspress.io/api/v1/pdf/analyze" \
    -H "Authorization: Bearer $PDFCHECK_API_TOKEN" \
    -F "file=@$1" | jq .
}
```

### Rate Limits
- No account: 10 free checks/day
- Free account: 50 checks/day
- API tokens: Generate at https://pdf.businesspress.io/account/api-tokens

### PDF Skills for AI Agents
Downloadable skill files available at https://pdf.businesspress.io/ai-agents#pdf-skills:
- PDF Analysis Skill — Metadata extraction, anomaly detection, structured reporting
- PDF Generate Skill — Create PDFs using ReportLab, pdf-lib, Puppeteer, WeasyPrint
- PDF Validation Skill — Structure validation, PDF/A compliance, accessibility checking
- PDF Workflow Skill — Chain operations: analyze → validate → optimize → deliver

## Technical Details

### Supported PDF Versions
PDF 1.0 through PDF 2.0

### File Size Limits
- Web upload: 100MB
- API upload: 100MB

### Analysis Methods
1. XMP metadata extraction
2. Document Information Dictionary parsing
3. Binary structure analysis
4. Software signature matching
5. Timestamp cross-validation
6. Incremental update detection

## Contact

- **Website**: https://pdf.businesspress.io
- **Email**: support@pdf.businesspress.io