# 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) - MCP and REST integration examples, shell wrapper, and copyable task instructions
- [Changelog](https://pdfcheck.online/changelog) - Product updates and new feature releases
- [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

The browser tools listed above are separate from the public integration methods. REST endpoints include:
- `POST /api/v1/pdf/analyze` - Inspect metadata; multipart field `file`
- `POST /api/v1/pdf/extract-text` - Extract text; multipart field `pdf`
- `POST /api/v1/pdf/to-markdown` - Convert to Markdown; multipart field `pdf`
- `GET /api/v1/pdf/{token}` - Retrieve an account-owned or public analysis; bearer token required
- `GET /api/v1/pdf` - List your analyses; bearer token required
- `GET /api/v1/user` - Check account usage; bearer token required

Metadata results use `data.metadata.basic.pages`, `data.metadata.basic.pdf_version`, `data.metadata.document`, and `data.metadata.dates`. The analysis identifier is `data.id`.

The remote MCP endpoint is `https://pdfcheck.online/api/mcp`. Its PDF tools are `analyze_pdf` (arguments: `file_base64`, `filename`), `get_analysis` (argument: `token`), `list_analyses`, and `check_usage`. Read the JSON result from `content[0].text`. It does not expose the browser utilities or text/Markdown extraction as MCP tools.

Anonymous metadata access allows 10 checks per day per IP across MCP and REST. A free account token has 100 checks per day. Authenticate when analyzing to retrieve the private result later; anonymous results must be kept by the client. Other tools have separate limits. Metadata cannot prove AI authorship, authenticity, signature trust, standards compliance, or accessibility.

## 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