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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.
+
+---
+
+Each tool serves a distinct role in managing and presenting PDF and document content, catering to different needs and platforms.