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# Guide to PDF and PostScript Tools
This guide provides an overview of three key tools used for handling PDF and PostScript files: Ghostscript, MuPDF, and PDF.js. Each tool has unique features and typical use cases.
## Ghostscript
### Role
- A versatile tool for handling PDF and PostScript (PS) files.
- Used for rendering, converting, and processing these file types.
### Typical Uses
- **PDF and PostScript Rendering**: Renders pages from PDF and PS files to bitmap formats for previewing and printing.
- **File Conversion**: Converts between PDF and PostScript formats and to other image formats like JPEG, PNG.
- **Processing and Analysis**: Analyzes, modifies, and creates PDF and PS files.
- **Integration**: Often integrated into other applications to provide PDF/PS processing capabilities.
## MuPDF
### Role
- Lightweight software developed by Artifex Software for viewing PDF, XPS, and eBook documents.
- Known for its high performance and simpler licensing.
### Typical Uses
- **PDF and XPS Viewing**: Primary use as a viewer for PDF and XPS files, suitable for desktop and mobile applications.
- **Annotations and Form Filling**: Supports interactive features in PDFs.
- **Cross-Platform Compatibility**: Works across various platforms, including Windows, Linux, macOS, and mobile OS.
## PDF.js
### Role
- An open-source PDF viewer developed by Mozilla, implemented entirely in JavaScript.
- Designed for web-based PDF viewing.
### Typical Uses
- **Web-based PDF Viewing**: Displays PDF files within web browsers, ideal for web applications.
- **Cross-Browser Compatibility**: Works across different web browsers without the need for specific PDF plugins.
- **Interactive Features**: Supports hyperlinks, annotations, and form fields in PDFs.
- **Customization and Integration**: Can be customized and integrated into web applications for a seamless user experience.
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Each tool serves a distinct role in managing and presenting PDF and document content, catering to different needs and platforms.