# PDFCheck - PDF Metadata Analyzer & Validator

> Privacy-focused PDF analysis, validation, conversion, editing, and AI-assisted review tools for people, developers, and AI agents.

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://pdfcheck.online/) - Analyze PDF creation date, author, software, and edit history
- [PDF Validator](https://pdfcheck.online/pdf-validator) - Validate PDF structure and check for corruption
- [AI Detection](https://pdfcheck.online/pdf-ai-detection) - Detect AI-generated PDF signatures (ChatGPT, Claude, etc.)
- [AI PDF Chat](https://pdfcheck.online/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://pdfcheck.online/optimize-pdf) - Compress and reduce PDF file size
- [PDF Signature Checker](https://pdfcheck.online/pdf-signature-checker) - Verify digital signatures and certificates in PDFs
- [PDF Image Extractor](https://pdfcheck.online/extract-images) - Extract all images from PDF documents with original quality
- [PDF Accessibility Checker](https://pdfcheck.online/pdf-accessibility-checker) - Check PDF accessibility compliance, tagged structure, and WCAG readiness
- [PDF/A Validator](https://pdfcheck.online/pdf-a-validator) - Check archival PDF/A compliance signals
- [Batch PDF Checker](https://pdfcheck.online/batch-pdf-checker) - Analyze multiple PDFs in one workflow
- [PDF Text Extractor](https://pdfcheck.online/pdf-text-extract) - Extract searchable text from PDF files
- [PDF to Markdown](https://pdfcheck.online/pdf-to-markdown) - Convert PDF content to structured Markdown
- [PDF Font Checker](https://pdfcheck.online/pdf-font-checker) - Identify fonts and embedding details
- [Compare PDFs](https://pdfcheck.online/pdf-compare) - Compare PDF versions and document properties
- [PDF to Image](https://pdfcheck.online/pdf-to-image) - Convert PDF pages to PNG or JPEG images
- [Merge PDF](https://pdfcheck.online/merge-pdf) - Combine PDF files
- [Split PDF](https://pdfcheck.online/split-pdf) - Extract pages or page ranges
- [PDF Password Tool](https://pdfcheck.online/pdf-password) - Add or remove authorized password protection
- [PDF Metadata Editor](https://pdfcheck.online/pdf-metadata-editor) - Edit document metadata fields
- [PDF Metadata Remover](https://pdfcheck.online/pdf-metadata-remover) - Remove hidden metadata before sharing
- [PDF Form Filler](https://pdfcheck.online/fill-pdf-form) - Fill in interactive PDF form fields online
- [PDF Form Builder](https://pdfcheck.online/build-pdf-form) - Add fillable form fields to any PDF document
- [PDF Editor](https://pdfcheck.online/edit-pdf) - Edit PDF text, images, and annotations online
- [PDF Highlighter](https://pdfcheck.online/highlight-pdf) - Highlight PDF text, add notes, and download annotated PDFs online

## Resources

- [How It Works](https://pdfcheck.online/how-it-works) - PDF analysis methodology
- [API Documentation](https://pdfcheck.online/api-docs) - REST API for developers
- [MCP Server](https://pdfcheck.online/mcp-server) - Model Context Protocol server for AI integrations
- [AI Agents](https://pdfcheck.online/ai-agents) - Complete guide for using PDFCheck with AI agents (system prompts, skills, CLI, workflows)
- [AI PDF Chat Guide](https://pdfcheck.online/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://pdfcheck.online/changelog) - Product updates and new feature releases
- [Tools Directory](https://pdfcheck.online/pdf-tools) - Database of PDF software signatures
- [Sitemap](https://pdfcheck.online/sitemap) - All pages and resources
- [XML Sitemap Index](https://pdfcheck.online/sitemap.xml) - Canonical machine-readable URL inventory
- [OpenAPI Catalog](https://pdfcheck.online/.well-known/api-catalog) - Machine-readable API discovery
- [Agent Skills Index](https://pdfcheck.online/.well-known/agent-skills/index.json) - Agent-readable skill and documentation discovery
- [MCP Server Card](https://pdfcheck.online/.well-known/mcp/server-card.json) - MCP capability metadata

## API Access

Authentication and current usage limits are documented in the API documentation. Core endpoints include:
- `POST /api/v1/pdf/analyze` - Upload and analyze PDF
- `GET /api/v1/pdf/{token}` - Retrieve analysis results
- `GET /api/v1/user` - Check usage and remaining quota

## More Information

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