Is my PDF uploaded to any server?

No. All PDF parsing and Markdown conversion run 100% locally in your browser memory using PDF.js. Your documents never touch any server or cloud database.

How does heading detection work?

The converter analyzes the font size and font weight metrics of every text item on the page relative to the median body font size, mapping titles to H1, H2, and H3 headers automatically.

Can I edit the generated Markdown immediately?

Yes! You can view and edit the generated Markdown in real-time, preview it side-by-side, download the .md file, or open it directly in the MDPreview live editor.

100% Client-Side & Private

Convert PDF to Clean Markdown Online

Fast, zero-latency in-browser converter. Extract text, headings, lists, and formatting from PDF files into GitHub-flavored Markdown. Your files never leave your device.

Drag & drop your PDF file here

Supports text-based PDF documents up to 50MB

Auto-detect Headings (by font size) Insert Page Dividers (---) Preserve Hard Line Breaks

100% Private & Client-Side

All parsing runs inside your browser using WebAssembly and PDF.js. Your sensitive contracts, notes, and research never leave your local machine.

Smart Structural Analysis

Automatically identifies title hierarchies (H1/H2/H3), bullet points, numbered lists, and monospace code blocks based on spatial typography layout.

Seamless Ecosystem Flow

Jump straight from converted Markdown to MDPreview live editor, or create viral social knowledge cards with one click in MD to Card.

How to Convert PDF to Markdown Online

Select or Drop PDF

Drag your PDF file into the drop zone, or click "Choose PDF File" to select any document from your computer.

Instant In-Browser Conversion

MDPreview processes every page locally, grouping lines, recognizing heading scales, and generating clean Markdown.

Copy, Download, or Edit

Copy formatted Markdown directly, download the .md file, or open it in our dual-pane live editor for further writing.

Frequently Asked Questions

Is my data uploaded to any remote server?

No. MDPreview runs 100% locally in your browser memory. We do not store, log, or upload your PDF files to any cloud server.

Can it convert scanned image-only PDFs?

This tool is designed for text-based PDFs (generated from Word, LaTeX, Google Docs, Notion, or export tools). Scanned image-only PDFs require OCR processing.

Is there a file size limit?

Since processing occurs directly in your computer's RAM, files up to 50MB and hundreds of pages convert with lightning speed without server limits.

Is this tool free to use?

Yes, MDPreview PDF to MD is completely free and open-source with no registration or subscription required.