MCP server PdfPecker

pdfpecker for Python

Fast HTML and Markdown to PDF, and PDF to images and text, for Python. No browser, no dependencies, no .NET to install.

pip install pdfpecker

import pdfpecker

pdf = pdfpecker.html_to_pdf("<h1>Invoice 42</h1><p>Total: <b>1,250.00 EUR</b></p>")
pdfpecker.html_file_to_pdf("templates/invoice.html", "invoice.pdf")     # images and CSS resolve next to the file
pdfpecker.markdown_file_to_pdf("README.md", "readme.pdf")

pngs = pdfpecker.pdf_to_images(pdf, dpi=96)        # one PNG per page (or format="jpeg"/"webp")
text = pdfpecker.pdf_to_text(pdf)                  # pages separated by \f
both = pdfpecker.merge_pdfs([pdf, "terms.pdf"])

This is the PdfPecker .NET library, compiled ahead of time into a native library that ships inside the wheel. PdfPecker has its own HTML parser, CSS engine, layout engine, PDF writer and PDF renderer, so a conversion takes about a millisecond for a one-page invoice and never starts a browser. The package version is the library version it holds. Documentation of what PdfPecker renders, its CSS support and its limitations: pdfpecker.net/docs.

Platforms

Wheels for Linux (glibc 2.28+ and musl, x86-64 and ARM64), macOS (Apple Silicon and Intel) and Windows (x64 and ARM64), on Python 3.9 and later. Each wheel is about 9 MB and has no Python or system dependencies.

Speed

From Python, on a 4-core Linux cloud VM, median time per document after warm-up; the documents are the benchmark pages of the PdfPecker repository:

	Invoice, 1 page	Feature tour, 5 pages	Report, 29 pages	Start-up and first PDF	Peak memory, one PDF
pdfpecker	0.7 ms	2.9 ms	32 ms	57 ms	32 MB
Chromium 153 via Playwright	24 ms	48 ms	290 ms	735 ms	542 MB
xhtml2pdf 0.2.28	33 ms	209 ms	2.9 s	453 ms	63 MB
WeasyPrint 70.0	324 ms	797 ms	4.2 s	1.1 s	75 MB

API

Every function takes bytes or a path for PDFs, raises a subclass of PdfPeckerError on failure, is thread-safe and releases the GIL while it works, so threads convert in parallel.

Function	Returns
html_to_pdf(html, **options)	PDF bytes from an HTML str or UTF-8 bytes
html_file_to_pdf(path, output=None, **options)	PDF bytes, also written to output when given; base_dir is the file's folder
markdown_to_pdf(markdown, **options)	PDF bytes from CommonMark with GitHub tables, task lists, strikethrough and footnotes
markdown_file_to_pdf(path, output=None, **options)	as html_file_to_pdf
pdf_to_images(pdf, dpi=150, format="png", pages=None, width=None, height=None, transparent=False, quality=None, password=None)	a list of encoded images, one per page
pdf_to_text(pdf, pages=None, password=None, order="reading")	the text in reading order, pages separated by \f; order="top_to_bottom" reads across columns as before 1.24.0
pdf_to_text_pages(pdf, pages=None, password=None, order="reading")	a list with the text of each page
pdf_to_markdown(pdf, pages=None, include_links=True, include_annotations=True, include_images=False, page_comments=False, max_pages=None, password=None)	GitHub Flavored Markdown of any PDF: headings, lists and tables in reading order, for search indexes and language models
pdf_page_count(pdf, password=None)	the number of pages
merge_pdfs(pdfs, title=None, author=None, bookmarks=True, creation_date=None)	one PDF from several
pdf_to_pdfa(pdf, output=None, conformance="PDF/A-2b")	any PDF converted to PDF/A-2b, -2u, -3b or -3u, as a PdfAResult with pdf, changes, problems and is_conformant
redact_pdf(pdf, output=None, text=None, pattern=None, areas=None, ignore_case=False, fill_color="#000000")	any PDF with the matching text, or the (page, x, y, width, height) areas in points, removed from the file (text, image pixels, shapes, links and fields), not only covered
read_barcodes(data, formats=None, try_inverted=True, pages=None, password=None, dpi=None)	the QR, Data Matrix, Code 128 and EAN-13 codes in an image or the pages of a PDF, as Barcode objects with format, text, data, is_gs1, page, position and corners
library_version()	the version of the PdfPecker library inside

pages takes a page number, a list of numbers, or a range such as "1-3,5", "8-" or "last", numbered from 1. Every function also takes timeout in seconds.

Options of the HTML and Markdown functions:

Option	Meaning
base_dir	The folder relative image, stylesheet and font paths resolve against. Without it, a document from a string loads no local files.
allow_file_access	Let the document read files outside base_dir too. Only for HTML you trust.
page_size, landscape	"A3", "A4" (default), "A5", "Letter", "Legal" or (width_mm, height_mm). A CSS @page { size } rule wins.
margin	In points (72 per inch): one number or (top, right, bottom, left). Default 36. CSS @page { margin } wins.
scale, shrink_to_fit	Zoom the content; shrink content wider than the page (on by default).
header_text, footer_text	A line of text in the top or bottom margin; {page} and {pages} are replaced. CSS margin boxes (@top-center, ...) do more.
fonts, use_system_fonts	TrueType/OpenType files or folders that CSS font-family can name; or look families up among the installed fonts.
title, author, subject, keywords, language	Document properties.
user_style_sheet	CSS applied after the document's own.
creation_date	A fixed date (datetime, date or Unix seconds): the output is then byte-identical from run to run.
conformance	"PDF/A-2b", "PDF/A-3b", "PDF/A-2u", "PDF/A-3u", "PDF/A-4" or "PDF/A-4f".
accessibility	"tagged", "PDF/UA-1" or "PDF/UA-2".
compress, bookmarks, max_pages	Compress streams (on); bookmarks from headings (on); stop beyond this many pages (100,000).

Errors: PdfPeckerArgumentError (also a ValueError) for bad options, PdfReadError for input that is not a readable PDF, PdfPasswordError, PdfLimitError for max_pages and the size limits, PdfTimeoutError (also a TimeoutError) and PdfFileError (also an OSError) for a font or file that cannot be read.

Using it from AI agents and skills

pdfpecker suits code that an agent writes and runs in a sandbox: one pip install, nothing to download at run time, no browser to launch, and errors that say what went wrong. A few things to tell the agent:

• Write the document as HTML with CSS; put page size, margins, page numbers and running headers in @page rules, for example @page { size: A4; margin: 20mm; @bottom-center { content: "Page " counter(page) " of " counter(pages) } }.
• There is no JavaScript: charts must be SVG or images, not a script that draws them.
• Images, stylesheets and fonts load from base_dir (or data: URIs), never from the network.
• The built-in fonts (Helvetica, Times and Courier, with bundled fallback fonts for the letters they lack) cover Latin, Greek and Cyrillic; other scripts come out as question marks. For Chinese, Japanese, Arabic, Hebrew, Hindi or Thai, pass fonts=[...] with a font that covers the script, or use_system_fonts=True.
• To check a result, render it back with pdf_to_images(pdf, dpi=60) and look at the pages, or read it with pdf_to_text.

MCP server

The package includes a Model Context Protocol server, so chat apps and coding agents that speak MCP can make PDFs, look at their pages and read them. It runs over stdio and needs nothing but this package:

claude mcp add pdfpecker -- uvx pdfpecker mcp            # Claude Code

For Claude Desktop and other apps that read an mcpServers setting:

{ "mcpServers": { "pdfpecker": { "command": "uvx", "args": ["pdfpecker", "mcp", "--root", "/Users/me/Documents/pdfs"] } } }

Tool	What it does
html_to_pdf	HTML (inline or a file) to a PDF file, with previews of the first pages to check the layout
markdown_to_pdf	the same for Markdown
render_pdf_pages	PNG images of up to 20 pages, for the model to look at
pdf_to_text	the text of a PDF, page by page
pdf_to_markdown	any PDF as Markdown, returned or written to a file
pdf_to_pdfa	any PDF converted to PDF/A, with what changed and what could not be fixed
pdf_info	page count and file size
merge_pdfs	several PDF files into one

The tools read and write files only inside the --root folders (repeatable), because the model picks the paths. The default is the current folder, or ~/PdfPecker when the server starts in the filesystem's root, as chat apps often do. python -m pdfpecker mcp runs the same server without uvx.

Building from source

The wheel's native library is built from the released PdfPecker NuGet package named in PDFPECKER_VERSION. It needs the .NET 10 SDK with the NativeAOT prerequisites (clang on Linux, Xcode on macOS, the Visual Studio C++ tools on Windows):

ci/build.sh linux-x64 manylinux_2_39_x86_64          # RID and wheel tag; builds, packs and tests the wheel

Or by hand: dotnet publish native/PdfPecker.Native.csproj -c Release -r linux-x64, copy pdfpecker_native.so (.dylib, .dll) into src/pdfpecker/, and run pytest. PDFPECKER_NATIVE_LIB points the package at a library elsewhere.

The C ABI (native/Exports.cs) is one function, pdfpecker_invoke(op, input, input_len, options_json, &output, &output_len, &error), plus pdfpecker_free, pdfpecker_version and pdfpecker_abi_version, so other languages with an FFI can use the same library.

Releasing

A PdfPecker release on NuGet is followed by a pull request here that changes PDFPECKER_VERSION. Once it is merged, the owner publishes a GitHub release tagged v<version>; the Wheels workflow builds the eight wheels again, checks the tag against PDFPECKER_VERSION and uploads them to PyPI with Trusted Publishing. It then lists the new version of the MCP server (server.json) in the official MCP Registry.

License

MIT. The wheel also contains the .NET runtime, zlib-ng and the fonts and data PdfPecker bundles, each under its own license: see THIRD-PARTY-NOTICES.md.