A comprehensive guide and workflow for reducing PDF file sizes through intelligent compression, image optimization, and structural cleanup.
Install & Download
1. ClawHub CLI
The fastest way to install a skill directly from the registry.
npx clawhub@latest install pdf-compress
2. Manual Installation
Copy the skill folder to one of these locations
~/.openclaw/skills/ <project>/skills/ Priority: Workspace > Local > Bundled
3. Prompt Installation
Copy this prompt to OpenClaw to install it automatically.
Help me install pdf-compress using Clawhub. If Clawhub is not installed, install it first (npm i -g clawhub).
Prefer to download?
Get the raw skill files in a ZIP archive.
What is PDF Compress?
The PDF Compress skill is designed to help users navigate the complex trade-offs between document quality and file size. By leveraging this tool within Openclaw Skills, developers and office professionals can systematically reduce PDF footprints for easier sharing via email, faster web loading, or efficient long-term storage. It provides a structured approach to analyzing document components—such as images, fonts, and metadata—to apply the most effective compression strategy without compromising the necessary visual fidelity.
PDF Compress Use Cases
- Reducing large document sizes to meet email attachment limits (e.g., under 5 MB).
- Optimizing high-resolution PDFs for fast-loading web previews.
- Batch processing multiple reports for archival storage with minimal quality loss.
- Preparing documents for professional printing by maintaining high DPI while removing unnecessary metadata.
- Cleaning up internal document structures to remove unused objects and hidden layers.
How PDF Compress Works
- Analyze the input PDF to identify size-heavy components like high-resolution images or un-subsetted fonts.
- Define the target output quality based on the intended use case (e.g., Archive, Print, Web, or Maximum Compression).
- Apply image optimization techniques including downsampling DPI and adjusting JPEG quality levels.
- Execute structural cleanups such as font subsetting and removing unused objects or annotations.
- Generate a comprehensive compression report comparing before and after metrics to ensure quality standards are met.
PDF Compress Setup
To get started with these Openclaw Skills, ensure you have access to the recommended PDF processing utilities.
For CLI Users
Install Ghostscript or qpdf for automated workflows:
# Install on macOS
brew install ghostscript qpdf
# Install on Ubuntu
sudo apt-get install ghostscript qpdf
For AI Agent Integration
Configure your environment to allow the agent to read file metadata and execute file operations commands.
PDF Compress Data Schema & Taxonomy
The skill generates detailed optimization plans and reports structured as follows:
| Data Object | Description | Key Fields |
|---|---|---|
| Compression Report | Post-process summary | File Size (Before/After), % Change, Quality Rating |
| Optimization Plan | Pre-process strategy | Target Size, Recommended DPI, JPEG Quality |
| Batch Job Template | Multi-file tracking | Input Folder, Total Savings, Progress Status |
| Quality Guide | Visual comparison | DPI Settings, Format Conversion (TIFF to JPEG) |
Files are typically organized by their intended use case (e.g., /optimized/web/ or /optimized/print/).
PDF Compress Advanced Features
- Multi-level preset logic ranging from Archival (minimal loss) to Maximum (preview-only).
- Advanced font optimization including subsetting to remove unused characters and duplicate instances.
- Detailed image downsampling controls across various resolutions (72 DPI to 300 DPI).
- Linearization for Fast Web View to enable streaming of large documents over slow connections.
- Automated batch compression jobs for processing entire directories of Openclaw Skills documentation assets.
SKILL.md
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