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.
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.
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.
npm install @firecrawl/anydoc
js
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]
pip install firecrawl-anydoc
python
import anydoc
markdown = anydoc.to_markdown("report.docx")
markdown = anydoc.to_markdown_bytes(data)
markdown = anydoc.to_markdown_bytes(data, "csv")
document = anydoc.to_document(data)
Full API reference:
[python/README.md]
npm install @firecrawl/anydoc-wasm
python
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]
cargo add anydoc
js
// 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)?;
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 throughpdf-inspector, no OCR service required.Agent ready. Ships as anAgent Skill: onenpx skills add firecrawl/anydoc
and any agent can read office documents.
| 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 |
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.
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
, ...).
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.
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.
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:
: the crateCargo.toml
: the npm packagenode/package.json
: the wheel (python/Cargo.toml
python/pyproject.toml
reads it)