Pdf MCP Server

pdf-mcp

Agentic RAG over your PDFs, with the evidence to check every answer.

The agent decides when to search; pdf-mcp does the retrieval and hands back excerpts, each with the page it came from. When the extracted text might be wrong, the agent can render that page and check it against what's actually printed. Hidden text, including injected instructions, is flagged, not silently passed on. It's an MCP server that lets Claude Code and other AI agents search one PDF or a whole folder, read only the pages that matter, and pull out tables, images, and scanned text, even from multi-column and Japanese layouts.

mcp-name: io.github.jztan/pdf-mcp

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See what your AI agent sees →

Drop in any PDF, or a whole folder of them, and watch an agent triage the corpus, search across every document at once, and read only the pages that matter, using a fraction of the tokens. 100% client-side, no install required.

Why pdf-mcp?

Installation

Claude Desktop: nothing to install first

1. Download pdf-mcp.mcpb.
2. In Claude Desktop, open Settings > Extensions, drag the file onto that page, and click Install.
3. Ask Claude about a PDF by its location, for example "Use pdf-mcp to summarize C:\Users\me\Downloads\report.pdf", or about a whole folder.

The first start downloads pdf-mcp's components (about 250 MB) and can take a few minutes; later starts take seconds. OCR for scanned pages is included: the first scanned page downloads an English-only Tesseract (about 14 MB). Needs Windows 10 or later, or macOS 13 or later (14 on Apple Silicon), and works in Claude Desktop's Chat. Updating, uninstalling and other details are in docs/clients.md.

Claude Code and other MCP clients

Needs Python 3.11 to 3.14. On 3.15 the installer falls back to a very old release, because a dependency has no 3.15 build yet. Install the pdf-mcp command with uv or pipx:

uv tool install pdf-mcp     # or: pipx install pdf-mcp

pip install pdf-mcp works inside a virtual environment; Homebrew's Python and recent Debian and Ubuntu refuse a system-wide pip install.

Then add it to your client. For Claude Code:

claude mcp add pdf-mcp -- pdf-mcp

For VS Code, Cursor, Codex CLI, Kiro or any other MCP client, see docs/clients.md. Then ask your agent to read a PDF.

Search, the corpus tools, tables and multi-column and CJK reading order work out of the box. For non-English documents, see language support. OCR on scanned pages also needs Tesseract:

brew install tesseract                             # macOS
sudo apt install tesseract-ocr                     # Ubuntu/Debian
winget install -e --id UB-Mannheim.TesseractOCR    # Windows

Optional: CUDA embedding on an NVIDIA card warms large folders one to two orders of magnitude faster; see docs/configuration.md.

From Python

pdf-mcp's tools are also plain Python functions, so you can import them and hand a PDF to the Anthropic SDK without running a server. Two runnable scripts, for a question and for a whole document: examples/.

Why this exists, and what broke along the way: Claude's 100-page PDF limit and how I got around it

Tools

13 specialized tools rather than one monolithic one. Typical pattern: pdf_info to plan, pdf_search to locate (its paragraph excerpts often answer the question outright), pdf_read_pages when you need more. For a folder, pdf_corpus_overview to triage, then pdf_corpus_search.

Text returned by any of these is untrusted content extracted from a PDF. pdf_info(content_trust=True) reports hidden text a human reader cannot see, and the read tools flag it per page.

Example prompts:

"Read the PDF at /path/to/document.pdf"
"Which pages discuss supply chain risks?"
"Find sections about the training process"
"Show me what page 5 looks like"
"OCR pages 3-5 of the scanned PDF"

Full reference, every parameter and response shape: docs/tool-reference.md. Embedding model selection: docs/embedding-models.md.

Example Workflow

For a large document (e.g., a 200-page annual report):

User: "Summarize the risk factors in this annual report"

Agent workflow:
1. pdf_info("report.pdf")
   → 200 pages, TOC shows "Risk Factors" on page 89

2. pdf_search("report.pdf", "risk factors")
   → Matches with structural paragraph excerpts: each excerpt
     is the bullet, paragraph, or heading that matched, not a
     fixed-width window. Often enough to answer directly.

3. If excerpts are sufficient → synthesize answer

4. If more context needed:
   pdf_read_pages("report.pdf", "89-95")
   → Full page text for deeper reading

Remote / HTTP transport

STDIO is the default and is what every example above uses. pdf-mcp-http serves the same tools over HTTP, for clients that cannot spawn a process (the Anthropic API MCP connector, claude.ai custom connectors) and for a warm corpus shared by several clients.

export PDF_MCP_AUTH_TOKEN="$(openssl rand -hex 32)"
pdf-mcp-http

Paths resolve on the server, so an HTTP agent reads what is already there: files under an allow-listed root, or a URL the server fetches. It cannot hand over a file from its own machine. It is single-tenant and fails closed: with no auth token and no [paths] allow list, the process exits rather than serving an open endpoint.

Docker images are published to GHCR for amd64 and arm64, with everything baked in, so every tool works on the first request:

./deploy.sh              # token, image, start, health-check
cp your.pdf documents/   # this folder is the server's /data/pdfs

Read docs/remote-access.md for the trust boundary and threat model before deploying, and docs/configuration.md for setup, client config, and token rotation.

Configuration

pdf-mcp works out of the box. To restrict which paths and URL hosts the server may touch, tune cache and worker settings, or add your own content-trust phrases, see docs/configuration.md.

Roadmap

See ROADMAP.md for planned features and release history.

Contributing

Contributions are welcome. See docs/contributing.md for setup, checks, the coherence eval harness, and quality-loop guidelines.

Contributors

Thank you to everyone who has helped improve this project through code, reviews, testing, and feature requests:

@Summer907 · @ebbsanchez · @VooDisss · @DerDennisOP · @deepdmk · @TheSOV · @janLo · @bbulkow · @HillsCloud · @phinnphace

Per-release contributor credits are listed in the Changelog.

Security

Found a vulnerability? See SECURITY.md for the threat model, reporting channel, and expected response timeline. Please do not open a public GitHub issue for unpatched security reports.

License

MIT. See LICENSE.

Links

• pdf-mcp on PyPI
• pdf-mcp on GitHub

Blog posts

The story behind the releases. Building pdf-mcp keeps surprising me: benchmarks that go the wrong way, formats that break everything, features I had to remove. I write about that thinking in The Dispatch. Come along if that's your kind of thing.

Background, benchmarks, and design notes from building pdf-mcp:

Getting started

• How I Built pdf-mcp: The problem with large PDFs in AI agents and a working solution
• How to Send PDFs Over 100 Pages to Claude's API: Measuring the real page and token ceilings on the Claude API, and the two ways around them: search the PDF on disk for questions, window the text and render only the picture pages for whole-document tasks
• How Claude Code Actually Reads PDFs: How AI agents use pdf-mcp tools to read and navigate PDF documents
• How AI Agents Should Read PDFs: 5 Patterns That Survived Production: Five production-tested patterns for how agents should navigate PDFs at scale

Corpus & multi-document search

• A Knowledge Base Is Just a Folder: Turning a folder of PDFs into an agent knowledge base with the corpus tools, no ingestion pipeline or vector store
• Cross-Document Retrieval for AI Agents Without a Vector Database: Why BM25 scores don't merge across per-document indexes but ranks do, and how two-stage RRF puts a gold document in the top 3 on 84.8% of 184 graded queries over a 100-PDF corpus
• How Amazon Bedrock Helped Me Make My RAG Better: Benchmarking pdf_corpus_search against Bedrock Knowledge Bases at an equal 2,000-token budget for four cents surfaced two bugs eight months of self-testing missed: an excerpt picker discarding answers from pages it had already retrieved, and one embedding per page hiding short answers
• Does a PDF Search Tool Still Matter for AI Agents?: Claude Code with and without pdf-mcp on 53 multi-paper questions over 120 papers: answer quality tied, but the search tool read 7.5 pages per question instead of 187 and answered in 25 seconds instead of 92

Search & retrieval

• Semantic vs Keyword Search for AI Agents: Benchmarks and a dual-search routing pattern: FTS5 for exact identifiers, embeddings for natural language
• Hybrid Search vs Query Routing for AI Agents: Why pdf-mcp uses hybrid RRF instead of query routing: benchmarks showing RRF wins across query types
• Section Chunking vs Page Chunking for AI Agents: Why section-aware search delivers full section content in one call while page-mode costs 2–6 extra tool calls per query
• Section-Level RAG: Why BM25 Beat Hybrid Search in My Benchmark: Why pdf-mcp's section-grain search is BM25-only: hybrid RRF caused a 33% lexical regression at section grain, so granularity decides the search technique
• How One Search Change Eliminated an Entire Agent Step: Switching pdf_search from fixed-width snippets to paragraph excerpts turned it from a pivot tool into a terminal tool: 97% vs 80% answer containment across a 30-query benchmark

Engineering & security

• MCP Server Security: 8 Vulnerabilities: What we found when we audited an MCP server for security holes
• Your LLM Is Free QA for Your MCP Server: Four Payload UX bugs in pdf-mcp that schema tests missed but Claude Desktop surfaced during real use
• Why Multi-Column PDFs Scramble Reading Order in RAG: Fixing two-column extraction (0.564 → 0.816 fidelity), the title-page author-grid regression it caused, and the aggregate metric that stayed blind to both
• How I Fixed Vertical Japanese PDF Extraction: Tategaki pages extract scrambled because reading order is geometric, not stored; rebuilding it from glyph positions (columns right to left, characters top to bottom), with no OCR and no new dependency
• My AI Agent Stopped Using My Own PDF Tool: The 72 DPI Bug: Phone scans silently downsampled to 72 DPI to fit the response byte budget made handwriting unreadable, so the agent routed around pdf_render_pages; the fix spends JPEG quality before resolution and makes the response say when a render is illegible and which clips to retry
• Extract Chart Data From PDFs: An MCP Tool That Won't Guess: Reading exact chart values straight from a PDF's vector geometry, then handing the ambiguous judgment calls back to the LLM instead of guessing