Hack the Hydra

PDF to Markdown for ChatGPT

Paste clean Markdown instead of raw PDF text and ChatGPT keeps track of sections, lists and headings, and stays inside its context window.

🔒 Private by design: the conversion runs in this browser tab. Nothing is uploaded.

PDF to Markdown for ChatGPT is a free online tool by Hack the Hydra. Convert a PDF to Markdown before pasting it into ChatGPT: structure kept, fewer tokens, better answers. Free, in your browser, no upload.

100% freeNo upload: runs in your browserNo sign-up

Why not upload the PDF directly?

Uploading works, but the model only sees what its own extractor pulls out, often without headings, with broken hyphenation and running headers repeated on every page. Markdown you control is predictable: you can trim irrelevant pages, check the text, and paste exactly what matters.

A prompt that works well

Paste the Markdown between triple backticks and say what it is: "Below is the Markdown of a 12-page contract. Answer only from it and quote the section heading you used." Headings in the Markdown make that citation possible.

Long PDFs

If the Markdown is longer than the context window, split it on the # and ## headings and ask about one section at a time. Headings are natural chunk boundaries.

How to use

  1. Drop your file in the box above, or click to pick it.
  2. Wait a few seconds while it converts locally.
  3. Copy the result or download it.

FAQ

Does ChatGPT read Markdown better than PDF?

Yes. Markdown keeps the document structure explicit (headings, lists, tables) with very few extra tokens, which helps the model locate and quote information.

Is my PDF sent to a server?

No. The conversion runs in your browser with pdf.js. Only you decide what goes into ChatGPT.

What about scanned PDFs?

They contain images, not text. Run the pages through the free Image to Text tool, or use the API, which OCRs scanned pages automatically.

Bulk conversion API

Need hundreds of PDFs, scanned PDFs (OCR) or real Markdown tables? Use the API: $3 per 1,000 PDFs, failed files free. Open the API →

curl -X POST "https://api.apify.com/v2/acts/extas_corp~pdf-to-markdown/run-sync-get-dataset-items?token=YOUR_TOKEN" \
  -H "Content-Type: application/json" -d '{"pdfUrls":[{"url":"https://arxiv.org/pdf/1706.03762"}]}'

Use it via API, with a free plan: Document to Markdown API (RapidAPI) · Apify

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