> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/core/viewer/viewer.md). # Server/Desktop PDF Viewer Library Apryse delivers a robust document viewer that supports text selection, search, and multiple page view modes, making it ideal for dynamic document handling. With features like zoom and fit modes, it en The viewer is a viewing and rasterization scroll view component that handles a number of viewing operations including rendering, caching, high level zoom rendering and layout modes. Viewing represents reading a document and displaying it as the author intended. Through the process of rasterization, it can take document data and convert it into pixels that come together to be rendered on a display. Apryse SDK offers the following benefits: * Interactive PDF Viewing or Rasterization * Full transparency support (Transparency Groups, Soft Masks, including all supported Blend Modes) * Core viewing operations (scrolling, panning, zooming, jumping to pages) * Standard & custom page viewing modes (e.g. single, facing, cover, scrolling, fit-page, fit-width, etc.) * Extensive support for PDF forms & digital signatures * Extensive annotation & real-time collaboration support * Regex text search across a page or an entire document * Manipulate pages (rotate, crop, move, copy/export, delete, merge documents) * View PDF separations * Easy navigation (with thumbnails, bookmarks, links, and history) * Selective viewing and hiding of contents in different layers (OCGs) * Security settings (custom encryption & DRM controls, dynamic watermarks) * PDF/A viewing mode * Support for R2L (Right to Left) languages (e.g. Arabic, Hebrew, etc) * Keyboard shortcuts More features: * PDF Image Export (JPEG, TIFF, PNG, and BMP) * Advanced image quality and compression settings controlling the rasterization process, allowing the user to choose between the output image quality and rendering speed * Reflow * Night, sepia and custom-color mode * ICC color management * Overprint control & preview * Display-list caching (speeding-up viewing of complex documents) * Direct & serverless rendering support for PDF, Word, PowerPoint, Excel, XPS, plain-text, mark-down, TIFF, and other image formats * PDF package support * Pressure-sensitive stylus support * Infinite Undo/Redo * Text to Speech Support * Font-substitution control ## Get started [View a document](/core/viewer/viewing.md) To view a PDF document. [Coordinates](/core/viewer/coordinates.md) To convert between PDF page and screen coordinates. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.apryse.com/core/viewer/viewer.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.