Markdown to PDF Converter

How It Works

This converter runs entirely inside your web browser. When you type Markdown into the left pane, a custom parser tokenizes the text and transforms it into HTML for the live preview on the right. When you click "Download as PDF," the tool constructs a valid PDF file byte-by-byte in memory, handling text layout, line wrapping, page breaks, and basic styling. The resulting file is offered as a direct download with no server involvement.

The PDF generator creates proper PDF 1.4 structure, including a header, page objects, content streams with text drawing operators, a cross-reference table, and a trailer. This means every PDF it produces is spec-compliant and opens correctly in all major PDF readers.

Supported Markdown Syntax

The -in parser handles the most widely used Markdown features without relying on any external library:

• Headings - # H1 through ###### H6
• Bold - bold or __bold__
• Italic - *italic* or _italic_
• Strikethrough - ~~deleted~~
• Inline code - `code`
• Code blocks - triple backtick fences with optional language tag
• Blockquotes - > quoted text
• Ordered lists - 1. item
• Unordered lists - - item or * item
• Links - [text](url)
• Images - ![alt](url)
• Horizontal rules - --- or *
• Tables - pipe-delimited tables with header separator

PDF Output Options

Before generating your PDF, you can configure several output settings to match your needs.

Page Size

Choose between A4 (210 x 297 mm, standard in most countries) and US Letter (8.5 x 11 inches, standard in North America). The converter adjusts margins and text flow to match the selected size.

Themes

Three visual themes are available:

• Light - white background with dark text, printing
• Dark - dark background with light text, easier on the eyes when reading on screen
• Sepia - warm, paper-like tones for a classic reading experience

Font Size

Adjust the base font size from 8pt to 24pt. Headings scale proportionally based on the base size you choose.

Common Use Cases

Markdown-to-PDF conversion is useful in many scenarios where you need polished documents from plain text source files:

• Documentation - Turn README files and project docs into shareable PDFs
• Reports - Write structured reports in Markdown and distribute as PDF
• Notes - Export study notes or meeting minutes for offline reading
• Resumes - Maintain a Markdown resume and generate a PDF when needed
• Blogging - Preview how Markdown content will look before publishing
• Proposals - Draft client proposals in Markdown and send polished PDFs

Tips for Better PDFs

Getting the best results from this tool comes down to a few simple practices:

• Use headings consistently. Start with # Title and use ## for major sections, ### for subsections.
• Keep paragraphs short. Walls of text are harder to read in PDF format than on a web page.
• Use code blocks for technical content. Fenced code blocks render with a monospaced font and distinct background in the PDF.
• Test with the Light theme if you plan to print. Dark and Sepia themes are better for on-screen reading.
• Try different font sizes. 11pt or 12pt works well for most documents; bump up to 14pt for presentations.

Technical Details

The PDF generation in this tool follows the PDF specification (ISO 32000). Each generated file includes:

• A PDF 1.4 header
• A catalog object pointing to the page tree
• Page objects defining media box dimensions
• Content streams with text operators (BT/ET, Tf, Td, Tj)
• Font resource dictionaries using Helvetica (a standard PDF base font)
• A cross-reference table for random access to objects
• A trailer with the root reference and object count

The Markdown parser is from scratch using regular expressions and line-by-line tokenization. It processes block-level elements first (headings, code blocks, lists, blockquotes, tables, horizontal rules, paragraphs), then applies inline formatting (bold, italic, strikethrough, code, links, images). This two-pass approach is consistent with how most Markdown implementations work, as described in the MDN Markdown reference.