When a PDF Has No Text Layer
A scanned PDF is often just images of pages. Without a text layer, PDF.js cannot extract words to turn into Markdown.
How to tell
- You cannot select text in a normal PDF reader.
- The converter reports that no extractable text was found.
What this preview does
The free preview tells you when extraction failed. It does not run OCR in-browser. For scans, use an OCR tool you trust, then paste the resulting text into PDFtoMD’s Paste plain text path to get Markdown structure (headings, lists, paragraphs).