Turning a PDF into Markdown sounds simple until you try it on a real document. The text comes out fine. Then the tables collapse into mush, the formulas turn to gibberish, the figures vanish, and a two-column research paper reads in the wrong order. Markdown is how documents get fed to AI tools, pasted into notes, and stored in wikis, so "mostly right" usually isn't good enough.
I compared the tools people actually reach for, judged on the parts that break: tables, formulas, images, scanned pages, reading order, and how much setup it takes to get there.
Upfront disclosure: I'm the maker of pdfmarkdown.app, one of the tools below — so factor that in. I've tried hard to be fair; every other tool here is genuinely good at something, and I say so. Check the claims yourself; tools change.
The short version
- Just want clean Markdown without installing anything? Use a browser tool like pdfmarkdown.app: private, no signup, and you can see what you're getting before you trust it.
- A developer building a RAG or document pipeline? Reach for an open-source library: Marker, Docling, or MarkItDown.
- Mostly heavy math, scientific papers, or handwriting? Mathpix is the specialist.
- An occasional, mixed-format conversion? A general converter like CloudConvert is fine.
There's no single winner. The right pick depends on whether you live in a terminal, and what's actually in your PDFs.
pdfmarkdown.app: best for non-developers who want it clean and private
Best for: anyone who wants clean Markdown in seconds, without a command line or an upload.
This is mine, so weigh it accordingly. The idea is to do the hard parts (tables, formulas rendered with real math typesetting, images, stripping page headers and footers) entirely in your browser, so the file never leaves your device. The part I care most about: you see the original PDF and the Markdown side by side, and when a page is hard to read cleanly, like a scanned page with no real text layer, it tells you up front rather than quietly handing you garbage. So you can check it before you paste it somewhere.
▶ Try it live at pdfmarkdown.app — drop in a PDF and watch it turn into Markdown side by side: the original on the left, the generated Markdown on the right.
Strengths: runs in the browser (private, no signup, free), keeps tables and formulas readable, shows you the result side-by-side, honest about scanned / hard pages instead of faking them.
Weaknesses: it's a web app, not a scriptable library; if you want to batch thousands of files in a pipeline, an open-source tool fits better. Formulas mostly come through as real math, but the occasional one still trips it up. And very hard scanned documents are hard for everyone, me included.
MarkItDown: best free tool for developers prepping files for an LLM
Best for: developers who want a quick, free way to turn many file types into Markdown for an LLM.
Microsoft's open-source MarkItDown is a Python library and CLI that converts PDFs (plus Office files, images, audio and more) into Markdown aimed squarely at language models. It's fast, free, and trivial to drop into a script.
Strengths: open-source, handles many formats, made for LLM input, easy to automate.
Weaknesses: it's a library, so there's no UI and no preview; you don't see problems until later. Complex tables, dense math and scanned pages are basic compared with the heavier extractors below.
Marker: best open-source quality for complex PDFs
Best for: developers who want the highest-fidelity open-source conversion and can run Python.
Marker is one of the strongest open-source PDF→Markdown converters: it handles tables, equations and images well, restores reading order, and can optionally use an LLM to boost accuracy.
Strengths: excellent extraction quality, good with equations and tables, actively developed.
Weaknesses: real setup: Python, and ideally a GPU for speed. It's a developer tool, not something you'd hand a non-technical colleague.
Docling: best for RAG and document pipelines
Best for: teams building retrieval-augmented generation (RAG) or structured document workflows.
IBM's open-source Docling focuses on document understanding: clean structure, solid tables, and exports designed to feed downstream AI pipelines. If your endpoint is a vector database rather than a human reader, it's a strong fit.
Strengths: structured output, good tables, pipeline- and RAG-oriented, open-source.
Weaknesses: developer-oriented; overkill if you just want to read one PDF as Markdown.
Mathpix: best for heavy math and scientific papers
Best for: scientific and technical documents that are mostly equations, or even handwriting.
Mathpix is the specialist for math. Its OCR for formulas, including handwritten ones, is best in class, which makes it the go-to for STEM papers and problem sets.
Strengths: outstanding formula and scientific OCR, handles handwriting, polished.
Weaknesses: commercial and paid, with usage limits on the free tier; narrower than a general converter if your documents are mostly prose and tables.
CloudConvert & general web converters: best for the occasional job
Best for: a one-off conversion where you don't need perfect fidelity.
General converters like CloudConvert handle dozens of formats including PDF→Markdown. They're convenient when you already use them for other conversions.
Strengths: convenient, many formats, no install.
Weaknesses: it's built for shuffling file formats, not for document fidelity. In my testing, images were dropped entirely and most tables and formulas came out garbled. Files are also uploaded to a server (a privacy consideration for sensitive documents), and volume is gated by credits or limits.
A note on Pandoc, Adobe, and heavier tools
A few names that come up a lot:
- Pandoc is the universal document converter, but it goes from Markdown to other formats far better than the reverse; it isn't really built to read an arbitrary PDF into clean Markdown. For Markdown → PDF it's excellent; for PDF → Markdown, look elsewhere.
- Adobe (Acrobat and the PDF Services API) extracts accurately and is built for enterprises. The API has a free tier, but it's developer- and business-oriented, aimed at production workflows rather than a quick one-off conversion.
- The developer heavyweights (MinerU, LlamaParse and Mistral OCR) are increasingly used in serious RAG and document pipelines. I didn't make them main picks because this guide leans toward simpler, no-setup options, but if you're building a production pipeline they're worth evaluating.
How to choose
A quick decision guide:
| If you are… | Start with |
|---|---|
| A non-developer who wants it clean, private and fast | pdfmarkdown.app or a general web tool |
| A developer prepping files for an LLM, fast | MarkItDown |
| A developer who needs the best open-source quality | Marker |
| Building a RAG / document pipeline | Docling |
| Working mostly with heavy math or handwriting | Mathpix |
| Doing a one-off, mixed-format conversion | CloudConvert |
Frequently asked questions
What's the best free PDF to Markdown tool?
For non-developers, a browser-based tool like pdfmarkdown.app is free and needs no signup. For developers, MarkItDown, Marker and Docling are all free and open-source, though Marker's license carries some commercial-use conditions worth checking before you ship it in a product.
Which PDF to Markdown tool keeps tables and formulas intact?
Tables and formulas are exactly where most tools fail. Among open-source options, Marker handles them best; for browser use, pdfmarkdown.app renders real math and keeps tables readable; for math-heavy documents specifically, Mathpix leads.
Is it safe to convert a confidential PDF online?
It depends on the tool. Most web converters upload your file to a server. Browser-based tools like pdfmarkdown.app do the work on your own device, so the file never leaves it. That's the safer choice for sensitive documents.
What's the best PDF to Markdown tool for RAG?
For retrieval-augmented generation, Docling and Marker are built for structured, pipeline-friendly output. MarkItDown is a lighter, faster option when you just need usable Markdown quickly.
I'm Jerome, the builder of pdfmarkdown.app, a free, browser-based PDF↔Markdown tool. I included direct competitors and tried to credit each one fairly. If you think I got a call wrong, tell me at hey@pdfmarkdown.app.
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