Can a scanned PDF be turned into Markdown?

Not directly. In a scanned PDF the text is a picture, so there is no text to pull out. Run OCR first to get a PDF that has text, then use this.

What happens to tables in the PDF?

They don’t become tables. The text inside a table comes out as lines and paragraphs in reading order.

They are guessed from text size, so they can be wrong. Check the headings and lists in the result box once.

Pull the text out of a PDF and save it as a .md file, keeping headings, lists and paragraphs. Your file never leaves this device.

PDF

How to use PDF to Markdown

Pulls the text out of a PDF and saves it as a .md file, keeping headings, lists and paragraphs. Pictures are not included; only text comes out.

Drop a PDF onto the screen, or click to choose one. Once it opens, the text is read and shown in the box.
On the “Markdown” tab, pick “Run on” or “Add a rule” under “Between pages”. It starts on “Run on”.
Click “Convert to Markdown”.
Check the result in the box, and click “Copy” to copy it.
To get a file, click “Save”. The file name is the original name with “-markdown” added, and the extension is .md.

Headings, lists and paragraphs are guessed from text size and line spacing. Text larger than the body becomes a heading, and from largest down it becomes #, ##, ###. They are guesses, so skim the result.
Tables don’t become tables. Bold, italic and links are not kept. Columns follow the reading order inside the PDF.
“Add a rule” puts --- where a page ends. “Run on” continues without a rule.
A scanned PDF, or one made from photos, holds its text as a picture, so it cannot be pulled out. Use “Open OCR” to run OCR first. If only some pages have no text, it tells you those pages are empty.
The file is processed in your browser and is not uploaded to a server.

Can a scanned PDF be turned into Markdown?: Not directly. In a scanned PDF the text is a picture, so there is no text to pull out. Run OCR first to get a PDF that has text, then use this.
What happens to tables in the PDF?: They don’t become tables. The text inside a table comes out as lines and paragraphs in reading order.
Are the headings accurate?: They are guessed from text size, so they can be wrong. Check the headings and lists in the result box once.