GitHub - firecrawl/anydoc: Convert Word, PowerPoint, Excel, OpenDocument, RTF, EPUB, CSV, and PDF to clean Markdown. Built in Rust, with Nod

anydoc

Fast Rust library that converts documents (Word, PowerPoint, Excel, OpenDocument, RTF, EPUB, CSV, and PDF) into clean GitHub-Flavored Markdown. Includes bindings for Node.js , Python , and the browser (WebAssembly).

Built by Firecrawl to turn any office document into LLM-ready Markdown in single-digit milliseconds, with one consistent output no matter which format goes in.

It powers Firecrawl Parse , so if you'd rather not run it yourself, the hosted API gives you the same conversion plus our OCR models for the scanned pages anydoc can't read on its own.

Try it in your browser : the demo page runs the library as WebAssembly, so files are converted locally and never leave your machine.

Quick start

Agent skill

anydoc ships as an Agent Skill , so your agent can read any document it runs into:

npx skills add firecrawl/anydoc

The skill teaches the agent to convert documents with the anydoc CLI. Works with Claude Code , Codex , Cursor , OpenCode , and any other compatible agent .

CLI

npx @firecrawl/anydoc report.docx # Markdown to stdout

npx @firecrawl/anydoc slides.pptx -o slides.md # or to a file

npx @firecrawl/anydoc - --format csv < data.csv # read stdin

npx downloads the prebuilt binary for your platform on first run. For a permanent anydoc command, install globally with npm install -g @firecrawl/anydoc . Run anydoc --help for all options.

Node.js

npm install @firecrawl/anydoc

import { toDocument , toMarkdown , toMarkdownBytes } from '@firecrawl/anydoc' ;

// From a file path: const markdown = await toMarkdown ( 'report.docx' ) ;

// From bytes, with the format detected from the content: const fromBytes = await toMarkdownBytes ( bytes ) ;

// Or name it, which signature-less formats (CSV) need: const fromCsv = await toMarkdownBytes ( bytes , 'csv' ) ;

// Or stop at the document model, which also carries embedded assets: const document = await toDocument ( bytes ) ;

Full API reference: node/README.md

Python

pip install firecrawl-anydoc

import anydoc

From a file path:

markdown = anydoc . to_markdown ( "report.docx" )

From bytes, with the format detected from the content:

markdown = anydoc . to_markdown_bytes ( data )

Or name it, which signature-less formats (CSV) need:

markdown = anydoc . to_markdown_bytes ( data , "csv" )

Or stop at the document model, which also carries embedded assets:

document = anydoc . to_document ( data )

Full API reference: python/README.md

Browser (WebAssembly)

npm install @firecrawl/anydoc-wasm

import init , { toMarkdownBytes , toDocument } from '@firecrawl/anydoc-wasm' ;

await init ( ) ;

// From bytes, with the format detected from the content: const markdown = toMarkdownBytes ( bytes ) ;

// Or name it, which signature-less formats (CSV) need: const fromCsv = toMarkdownBytes ( bytes , 'csv' ) ;

// Or stop at the document model, which also carries embedded assets: const document = toDocument ( bytes ) ;

Full API reference: wasm/README.md

Rust

cargo add anydoc

// From a file path: let markdown = anydoc :: to_markdown ( "report.docx" ) ? ;

// From bytes, with the format detected from the content: let markdown = anydoc :: to_markdown_bytes ( & bytes , None ) ? ;

// Or name it, which signature-less formats (CSV) need: let markdown = anydoc :: to_markdown_bytes ( & bytes , anydoc :: Format :: Csv ) ? ;

// Or stop at the document model, which also carries embedded assets: let document = anydoc :: to_document ( & bytes , None ) ? ;

Features

• One output for every format. Each format parses into a shared document model and renders through a single Markdown serializer, so escaping, tables, heading anchors, and footnotes behave identically whether the input was a .doc from 2003 or a .pptx from yesterday.

• Full document structure. Headings with anchors, bold/italic/strikethrough, inline code and code blocks, links and internal cross-references, bulleted/numbered/nested/task lists with the source's own numbering, tables with merged cells and header rows, block quotes, footnotes and endnotes, and speaker notes.

• Embedded assets. Images and embedded objects render as their alt text in the Markdown, and the raw bytes stay available on the document model, tagged with their media type. Images with an external URL become ordinary Markdown images.

• Content-based format detection. The format is read from the bytes themselves (PDF header, RTF open group, OLE stream names, ZIP package mimetype), so mislabeled files still convert correctly.

• Fast. Pure Rust, no ML models, no external services. Median conversion time is under 5ms per document.

• Bindings that stay out of the way. Node.js conversion runs on the libuv thread pool and never blocks the event loop; Python releases the GIL so other threads keep running. TypeScript types and Python stubs ship with the packages.

• PDF support built in. Text-based PDFs convert locally through pdf-inspector , no OCR service required.

• Agent ready. Ships as an Agent Skill : one npx skills add firecrawl/anydoc and any agent can read office documents.

Supported formats

Format Extensions

Word .doc , .docx , .docm

PowerPoint .ppt , .pps , .pot , .pptx , .pptm , .ppsx , .ppsm

Excel .xls , .xlsx , .xlsm , .xlsb

OpenDocument .odt , .ods , .odp

Rich Text Format .rtf

EPUB .epub

CSV .csv

PDF .pdf

Benchmark

anydoc is measured against six other converters on 100 real-world documents spanning fourteen formats. Scores run from 0 to 100, higher is better; speed is the median time to convert one document.

tool formats median ms docs judged score completeness structure formatting cleanliness

anydoc 14/14 4.4 94 81 87 79 78 81

libreoffice 12/14 1129.5 87 40 59 42 40 24

unstructured 8/14 572.9 58 63 76 59 51 63

markitdown 6/14 134.8 33 65 78 66 60 52

pandoc 5/14 102.1 34 56 74 57 56 38

docling 4/14 513.6 21 57 60 60 57 51

mammoth 1/14 52.5 8 70 84 71 75 51

Per format, like for like:

format anydoc libreoffice unstructured markitdown pandoc docling mammoth

doc 87 57 67 - - - -

docm 84 48 - - - - -

docx 88 56 53 71 68 71 70

epub 77 - 72 72 52 - -

odp 86 23 - - - - -

ods 82 38 - - - - -

odt 80 51 68 - 60 - -

ppt 80 26 - - - - -

pptx 74 24 - 66 - 52 -

rtf 88 53 46 - 45 - -

xls 80 38 66 62 - - -

xlsm 76 32 - - - - -

xlsx 72 30 66 55 - 47 -

How quality was scored: an LLM judge (Claude Sonnet 5) compares two tools' outputs blind against ground truth: the document's first six pages, rendered to images by LibreOffice. Each output is scored on completeness, structure, formatting, and cleanliness.

Every pair is judged twice with the outputs swapped to cancel position bias, for 482 verdicts in total. Each tool's score averages its per-format scores over the formats it supports, so a corpus heavy in one format can't skew it.

It also means each row averages a different set of formats (mammoth's 69 is docx alone, while anydoc's 81 spans all fourteen), so the per-format table is the fair comparison.

Speed is one warm conversion per document on a Ryzen 9 9950X3D (Windows 11, 64 GB DDR5-6400). anydoc and the Python libraries are timed with process spawn excluded; the CLI tools include it, since that is how they are used.

The harness lives in bench/ ; the corpus is not redistributable and is not in the repo.

Best fit: pipelines that receive a mixed bag of office documents and need one consistent, structured Markdown output.

In this comparison, anydoc was the only tool to cover all fourteen formats, scored highest on every judged format, and converted documents an order of magnitude faster than the next-fastest tool.

Format detection

The format is read from the file content, using the marker its specification designates: the PDF header, the RTF open group, OLE stream names, the ZIP package mimetype and content types. CSV has no such marker, so the extension or an explicit format names it instead.

Format :: from_bytes ( & bytes ) ; // Some(Format::Docx), or None when nothing matches Format :: from_extension ( "pptm" ) ; // Some(Format::Pptx) Format :: from_path ( Path :: new ( "report.odt" ) ) ; // Some(Format::Odt)

The same three functions exist in Node ( formatFromBytes , ...) and Python ( anydoc.format_from_bytes , ...).

Errors

A conversion returns Err only when no meaningful Markdown could come out of the file. ConvertError names what went wrong:

match anydoc :: to_markdown ( path ) { Ok ( markdown ) => Some ( markdown ) , // No document comes out of these, so record the file and take the next one. Err ( error @ ( ConvertError :: Encrypted | ConvertError :: Unsupported ( _ ) ) ) => { unconverted .

push ( ( path , error ) ) ; None } Err ( error ) => return Err ( error ) , }

Variant Meaning

Unsupported Unknown format, or one that cannot be converted (an image-only PDF)

Malformed Structurally unusable: no meaningful content could be extracted

Encrypted Encrypted or password-protected

ResourceLimit Crossed a fixed safety limit (decompression, nesting, node count)

MissingPart A part required for any meaningful output is absent

Io The file could not be read, from to_markdown only

Node and wasm publish the variant name on error.code ; Python raises one anydoc.ConvertError subclass per variant, or OSError when the file cannot be read.

How it works

document bytes │ ├─► format detection → content markers, not the extension │ ├─► format parser → one per format (doc, docx, ppt, pptx, xls, │ xlsx, odt/ods/odp, rtf, epub, csv) │ │ │ └─► Document → shared model: blocks, inlines, tables, │ footnotes, assets │ │ │ └─► GFM serializer → Markdown │ └─► PDF → pdf-inspector → Markdown directly

Because every format funnels through the same document model and serializer, output quirks get fixed once. A table-escaping fix for docx is automatically a table-escaping fix for rtf, odt, and everything else.

Development

cargo test

cd node && npm install && npm run build && npm test

cd python && pip install maturin && maturin develop && python -m unittest discover -s tests

wasm-pack build wasm --release --target web --scope firecrawl && node --test wasm/test.mjs # see wasm/README.md

A committed fixture corpus under tests/fixtures/ is snapshot-tested, tests/robustness.rs mutation-tests every fixture, and fuzz/ carries cargo-fuzz targets per format. The speed and quality benchmark lives in bench/ .

Releases are tagged v<version> , which publishes the crate, the npm package, and the PyPI wheels from .github/workflows/release.yml . The version lives in three places, bumped together for a release:

• Cargo.toml : the crate

• node/package.json : the npm package

• python/Cargo.toml : the wheel ( python/pyproject.toml reads it)

License

MIT

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