seamless-pdf 1.0.3

Convert HTML, Markdown, and DOCX documents into continuous, single-page PDFs.

Seamless PDF

Convert HTML, Markdown, and DOCX documents into continuous, single-page PDFs -- no page breaks.

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Standard PDF converters split your content across fixed-size pages. Seamless PDF renders the entire document onto a single continuous page perfectly sized to the content's width and height. Ideal for long-form reports, documentation snapshots, newsletters and any workflow where page breaks get in the way or you want to retain the original content viewing experience i.e it retains original table of contents.

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Features

Feature	Description
Single-Page Output	One continuous PDF sized exactly to your content
Multi-Format Input	Supports .html, .md, .markdown, and .docx files
CLI & Python API	Use from the terminal or integrate directly into your code
Markdown Rendering	GitHub-flavored Markdown with syntax highlighting via Pygments
Theme Selection	Render output with light or dark theme via API/CLI
Page Width Control (v1.0.0)	Option to enforce a maximum page width (e.g., 800px)
Custom Margins (v1.0.0)	Added --margin-top, --margin-right, --margin-bottom, and --margin-left arguments
PDF Outlines / Bookmarks (v1.0.0)	Automatically extracts headers (<h1> to <h6>) and maps them into native PDF bookmarks

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Installation

pip install seamless-pdf
python -m playwright install chromium
playwright install

[!IMPORTANT] Playwright uses a headless Chromium browser under the hood to render documents. The standard pip install does not download the browser binary automatically. For first-time installs or updates, you must download the Chromium browser by running python -m playwright install chromium followed by playwright install.

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Quick Start

Command Line

seamless-pdf input.html -o output.pdf
seamless-pdf README.md -o README.pdf
seamless-pdf report.docx -o report.pdf
seamless-pdf README.md -o README-dark.pdf --theme dark

# Width and Margin control
seamless-pdf README.md -o README-custom.pdf --width 1000px --margin-top 50px --margin-bottom 50px

Python API

from seamless_pdf import convert

convert("input.html", "output.pdf")
convert("README.md", "readme.pdf")
convert("report.docx", "report.pdf")

# Theming, width, and margin overrides
convert(
    "README.md", 
    "readme-custom.pdf", 
    theme="dark", 
    width="1000px", 
    margin_top="50px"
)

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Usage

The convert function automatically detects the input format from the file extension (.html, .htm, .md, .markdown, .docx). You can also specify the format explicitly:

from seamless_pdf import convert

# Auto-detected as Markdown
convert("docs/notes.md", "notes.pdf")

# Explicit input type override
convert("docs/notes.txt", "notes.pdf", input_type="markdown")

# Optional render theme (light or dark)
convert("docs/notes.md", "notes-dark.pdf", theme="dark")

CLI Options

# Explicit input type override
seamless-pdf docs/notes.txt -o notes.pdf --input-type markdown

# Dark theme rendering
seamless-pdf docs/notes.md -o notes-dark.pdf --theme dark

# Custom page width and margins
seamless-pdf docs/notes.md -o notes.pdf --width 800px --margin-left 20px --margin-right 20px

Notes on Dark Mode

[!NOTE] Dark mode behavior depends on the input type:

• Markdown / DOCX inputs: Seamless PDF generates HTML and injects the selected theme styles. Using --theme dark is guaranteed to produce dark-themed output consistently.
• HTML inputs: Seamless PDF respects the source HTML/CSS. If the source HTML is not dark-aware (no dark styles or prefers-color-scheme), dark output is best effort and cannot be guaranteed. Provide dark-ready HTML for the best results!

Supported Input Types

Extension	Type Keyword
.html, .htm	html
.md, .markdown	markdown
.docx	docx

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Requirements

Dependency	Version
Python	3.10, 3.11, 3.12, 3.13
Playwright (Chromium)	>= 1.40.0
markdown	>= 3.10.1
Pygments	>= 2.17.0
pymdown-extensions	>= 10.0
mammoth	>= 1.6.0
pypdf	>= 3.17.0

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Roadmap

• PDF-to-PDF re-rendering (merge & reflow existing PDFs)
• Broader PDF manipulation toolset

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What's New in V1.0.1 / V1.0.0

• Fixed an issue where fractional pixel rounding in Chromium caused a blank second page to render for certain documents.
• Fixed pypdf not installing automatically with pip install seamless-pdf.
• Added Page Width Control via the --width CLI argument or API parameter to bound extremely wide documents.
• Added Custom Margins / Padding (--margin-top, --margin-right, --margin-bottom, --margin-left) to let text breathe.
• Added PDF Outlines (Bookmarks). Seamless PDF now automatically parses headers (<h1> to <h6>) and injects them hierarchically into the final continuous PDF!
• Hardened unit tests, stabilized edge cases, and expanded CLI/API configuration consistency.

see changelog.md for more

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Cloning for your purposes...

git clone https://github.com/SleepyPandas/Document-to-ContinuousPDF.git
cd Document-to-ContinuousPDF
pip install -e ".[dev]"
pytest

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License

This project is licensed under the MIT License -- see the LICENSE file for details.