markdown-svg 0.6.2

Convert Markdown to SVG with automatic text wrapping

markdown-svg

The missing markdown-to-SVG library for Python

Convert Markdown to SVG with automatic text wrapping. Zero dependencies.

🚀 Try the Live Playground — see it in action, no installation required!

📝 Read the blog post for background on the challenges and how they were solved.

Why This Library?

SVG has no native text flow or wrapping. If you need to embed formatted text in SVG (for dashboards, diagrams, exports, or anywhere else), you've had to manually position every line. Until now.

markdown-svg parses your Markdown and renders it as properly wrapped, styled SVG.

Installation

pip install markdown-svg

Quick Start

from mdsvg import render

# Render markdown to SVG
svg = render("""
# Hello World

This is a paragraph with **bold** and *italic* text.

- Item one
- Item two
- Item three
""")

# Save to file
with open("output.svg", "w") as f:
    f.write(svg)

Features

• Headings (h1-h6)
• Paragraphs with automatic word wrapping
• Inline formatting: bold, italic, bold+italic, inline code
• Links (rendered as styled text, clickable in SVG viewers)
• Lists: unordered (bullets) and ordered (numbers)
• Code blocks with syntax highlighting background
• Blockquotes with styled left border
• Horizontal rules
• Tables with headers and alignment
• Images (as <image> elements)
• Zero dependencies - pure Python

API

Basic Rendering

from mdsvg import render, measure

# Render with default settings
svg = render("# Hello World")

# Customize width and padding
svg = render("# Hello World", width=600, padding=30)

# Measure dimensions without rendering
size = measure("# Hello\n\nLong paragraph...", width=400)
print(f"Height needed: {size.height}px")

Custom Styling

from mdsvg import render, Style

style = Style(
    # Fonts
    font_family="Georgia, serif",
    mono_font_family="'Courier New', monospace",
    base_font_size=16.0,
    line_height=1.6,

    # Colors
    text_color="#333333",
    heading_color="#111111",
    link_color="#0066cc",
    code_color="#c7254e",
    code_background="#f9f2f4",

    # Heading scales
    h1_scale=2.25,
    h2_scale=1.75,
)

svg = render("# Styled Heading", style=style)

Built-in Themes

from mdsvg import render, DARK_THEME, GITHUB_THEME, LIGHT_THEME

# Use dark theme
svg = render("# Dark Mode", style=DARK_THEME)

# Use GitHub-style theme
svg = render("# GitHub Style", style=GITHUB_THEME)

Working with the AST

from mdsvg import parse, render_blocks

# Parse to AST (for inspection or modification)
blocks = parse("# Hello\n\nWorld")
# Returns: [Heading(level=1, ...), Paragraph(...)]

# Render pre-parsed blocks
svg = render_blocks(blocks, width=400)

Modifying Styles

from mdsvg import Style

# Create a base style and modify it
style = Style()
dark_style = style.with_updates(
    text_color="#e0e0e0",
    code_background="#2d2d2d",
)

Text Width Estimation

By default, this library estimates text width using character-based heuristics. This works well for common system fonts but may be less accurate for unusual fonts.

Precise Measurement (Default)

Text measurement uses fonttools for accurate width calculation:

from mdsvg import FontMeasurer, create_precise_wrapper

# Use system font
measurer = FontMeasurer.system_default()
width = measurer.measure("Hello World", font_size=14)

# Or use precise text wrapping
wrap = create_precise_wrapper(max_width=300, font_size=14, measurer=measurer)
lines = wrap("Long text that needs accurate wrapping...")

Custom Fonts

Use any TTF/OTF font file for measurement:

from mdsvg import FontMeasurer

# From your project's fonts directory
measurer = FontMeasurer("./fonts/MyFont-Regular.ttf")

# Or from system font directories
measurer = FontMeasurer("/Library/Fonts/Arial.ttf")  # macOS
measurer = FontMeasurer("C:/Windows/Fonts/arial.ttf")  # Windows

Recommended font locations:

• Project directory: ./fonts/MyFont.ttf
• macOS user fonts: ~/Library/Fonts/
• Linux user fonts: ~/.local/share/fonts/
• Windows user fonts: C:\Users\<user>\AppData\Local\Microsoft\Windows\Fonts\

Google Fonts

Download fonts from Google Fonts automatically:

from mdsvg import download_google_font, FontMeasurer

# Downloads and caches the font
font_path = download_google_font("Inter")
measurer = FontMeasurer(font_path)

# With specific weight (400=regular, 700=bold)
bold_path = download_google_font("Inter", weight=700)

# Popular Google Fonts that work well:
# - Inter (modern sans-serif)
# - Roboto (Android default)
# - Open Sans (highly readable)
# - Lato (elegant sans-serif)
# - Source Code Pro (monospace)

Disabling Precise Measurement

To use heuristic estimation instead (faster but less accurate):

from mdsvg.renderer import SVGRenderer

renderer = SVGRenderer(use_precise_measurement=False)

Full Style Options

Option	Default	Description
font_family	system-ui, sans-serif	Primary font stack
mono_font_family	ui-monospace, monospace	Font for code
base_font_size	14.0	Base font size in pixels
line_height	1.5	Line height multiplier
text_color	#1a1a1a	Default text color
heading_color	None	Heading color (falls back to text_color)
link_color	#2563eb	Link color
link_underline	True	Whether to underline links
code_color	#be185d	Inline code text color
code_background	#f3f4f6	Code background color
blockquote_color	#6b7280	Blockquote text color
h1_scale - h6_scale	2.0 - 0.9	Heading size multipliers
paragraph_spacing	12.0	Space between paragraphs (px)
list_indent	24.0	List indentation (px)
char_width_ratio	0.48	Average character width ratio

Playground

Try markdown-svg in your browser with the interactive playground:

🚀 Live Demo and Playground — no installation required!

Or run locally:

git clone https://github.com/davefowler/markdown-svg
cd markdown-svg
make play
# Open http://localhost:8765

Features:

• Live preview as you type
• Customize styling via JSON
• Load example markdown files
• Download rendered SVGs

See playground/README.md for details and API documentation.

Examples

See the examples/ directory for more usage examples:

• basic.py - Simple rendering
• custom_style.py - Custom styling and themes
• measure_and_render.py - Measuring before rendering

The playground/examples/ directory contains markdown files showcasing various features.

Development

# Clone and install
git clone https://github.com/davefowler/markdown-svg.git
cd markdown-svg
make dev          # Install with dev dependencies

# Common commands
make play         # Run the playground
make test         # Run tests
make lint         # Run linter
make typecheck    # Run type checker
make help         # Show all commands

Roadmap

Planned enhancements:

• Syntax Highlighting - Colorized code blocks using Pygments with VS Code theme support. See notes/SYNTAX_HIGHLIGHTING_PLAN.md for details.

License

MIT License - see LICENSE for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

Related Projects

• This is the only Python library (that we know of) for rendering Markdown directly to SVG
• For HTML output, see markdown, mistune, or markdown-it-py