Universal Document Viewer for the Web
Open-source, embeddable viewer for PDF, PPTX, and images — powered by a high-performance WebAssembly engine.
Runs entirely in the browser. No server required. No document upload.
$ npm install @docmentis/udoc-viewer
Why udoc-viewer
Built different, on purpose
A unified rendering engine designed for accuracy, performance, and embeddability — built specifically for modern web applications.
Unified Rendering Engine
Single engine for PDF, PPTX, and images. Consistent layout, no format-specific hacks. Powered by a custom WebAssembly engine written in Rust.
High-Fidelity Rendering
Accurate text, embedded fonts, vector graphics, EMF/WMF support.
Fully Client-Side
All rendering happens in the browser. No server required.
Embeddable by Design
MIT-licensed viewer layer with a clean JavaScript API.
See it in action
Try it right here
This is the actual viewer running live — not a screenshot. Open a PDF, switch documents, zoom, navigate pages.
Quick Start
Up and running in minutes
Three steps to embed the universal document viewer in your application.
Install the package
Add @docmentis/udoc-viewer via npm, yarn, or pnpm.
Add the component
Import and place the viewer element in your HTML or framework component.
Load a document
Pass a file URL or ArrayBuffer — the viewer handles the rest.
import { UDocClient } from "udoc-viewer";
const client = await UDocClient.create();
const viewer = await client.createViewer({
container: document.getElementById("viewer"),
});
await viewer.load("/document.pdf");Formats
Supported Formats
One viewer, multiple document types.
Full rendering with annotations and embedded fonts
PPTX
PowerPoint presentations with slides and shapes
Images
PNG, JPEG, TIFF, BMP, and more
DOCX
Word documents (coming soon)
XLSX
Excel spreadsheets (coming soon)
Free PDF Tools
More than just viewing
Powered by the same engine. All processing happens in your browser — files never leave your device.
Licensing
Free Viewer for Commercial or Personal
Viewer
MIT License
Open-source and free for any project, commercial or personal.
WASM Engine
Free with the viewer
The rendering engine is free to use when embedded through the viewer.
Commercial
Custom licensing
Use the engine standalone, remove attribution branding, or get dedicated support.
Start embedding documents today
Free to embed. Powered by Rust and WebAssembly.