# PDFCheck - PDF Metadata Analyzer & Validator

> Free online PDF analysis tool. Check metadata, validate documents, detect AI-generated PDFs, and optimize file size. 50 free checks daily with account.

PDFCheck is a comprehensive PDF analysis platform that helps verify document authenticity, extract metadata, detect AI-generated content, and optimize PDF files.

## Main Tools

- [PDF Metadata Checker](https://pdf.businesspress.io/) - Analyze PDF creation date, author, software, and edit history
- [PDF Validator](https://pdf.businesspress.io/pdf-validator) - Validate PDF structure and check for corruption
- [AI Detection](https://pdf.businesspress.io/pdf-ai-detection) - Detect AI-generated PDF signatures (ChatGPT, Claude, etc.)
- [AI PDF Chat](https://pdf.businesspress.io/pdf-ai-chat) - Chat with a PDF using source-backed AI answers, summaries, comments, selected context, OCR fallback, Markdown export, and page citations
- [PDF Optimizer](https://pdf.businesspress.io/optimize-pdf) - Compress and reduce PDF file size
- [PDF Signature Checker](https://pdf.businesspress.io/pdf-signature-checker) - Verify digital signatures and certificates in PDFs
- [PDF Image Extractor](https://pdf.businesspress.io/extract-images) - Extract all images from PDF documents with original quality
- [PDF Accessibility Checker](https://pdf.businesspress.io/pdf-accessibility-checker) - Check PDF accessibility compliance, tagged structure, and WCAG readiness
- [PDF Form Filler](https://pdf.businesspress.io/fill-pdf-form) - Fill in interactive PDF form fields online
- [PDF Form Builder](https://pdf.businesspress.io/build-pdf-form) - Add fillable form fields to any PDF document
- [PDF Editor](https://pdf.businesspress.io/edit-pdf) - Edit PDF text, images, and annotations online
- [PDF Highlighter](https://pdf.businesspress.io/highlight-pdf) - Highlight PDF text, add notes, and download annotated PDFs online

## Resources

- [How It Works](https://pdf.businesspress.io/how-it-works) - PDF analysis methodology
- [API Documentation](https://pdf.businesspress.io/api-docs) - REST API for developers
- [MCP Server](https://pdf.businesspress.io/mcp-server) - Model Context Protocol server for AI integrations
- [AI Agents](https://pdf.businesspress.io/ai-agents) - Complete guide for using PDFCheck with AI agents (system prompts, skills, CLI, workflows)
- [AI PDF Chat Guide](https://pdf.businesspress.io/blog/chat-with-any-pdf-ai-pdf-chat-tool) - Educational guide to AI PDF chat, source citations, OCR, annotations, and PDF review workflows
- [Changelog](https://pdf.businesspress.io/changelog) - Product updates and new feature releases
- [Tools Directory](https://pdf.businesspress.io/pdf-tools) - Database of PDF software signatures
- [Sitemap](https://pdf.businesspress.io/sitemap) - All pages and resources

## API Access

Registered users get 50 free PDF analyses per day. API endpoints available:
- `POST /api/v1/pdf/analyze` - Upload and analyze PDF
- `GET /api/v1/pdf/{id}` - Retrieve analysis results
- `GET /api/v1/user` - Check usage and remaining quota

## More Information

- [Full Documentation](https://pdf.businesspress.io/llms-full.txt) - Detailed technical documentation
- [About](https://pdf.businesspress.io/about) - Our mission
- [Privacy Policy](https://pdf.businesspress.io/privacy) - Data handling practices