@open-secure-viewer/core

Framework-agnostic secure PDF + Office viewer SDK powered by Google PDFium WASM (BSD-3). Zero Apryse/PDFTron license fees.

Install

npm i @open-secure-viewer/core

Features

• PDF rendering via PDFium WASM — pixel-perfect, runs entirely in the browser
• IntersectionObserver lazy rendering — pages 1–2 appear instantly; rest render on scroll
• Streaming fetch with progress (onProgress callback)
• Watermarks burned into canvas pixels (not a DOM overlay — cannot be removed with DevTools)
• Security controls: block print, copy, context menu, keyboard shortcuts
• Full annotation engine — 11 annotation types, XFDF import/export, burn-to-PDF
• PDF mutations — reorder/delete/rotate/duplicate pages, redaction, form filling
• Password-protected PDF support
• Full-text search with highlights
• DOCX/XLSX/Image/Text renderers (via @open-secure-viewer/office)
• onDownloadAttempt hook for DRM enforcement

Quick Start

import { OsvViewer } from '@open-secure-viewer/core';

const viewer = new OsvViewer(document.getElementById('viewer')!, {
  security: {
    disablePrint: true,
    disableCopy: true,
    watermark: { text: 'CONFIDENTIAL', opacity: 0.15 },
  },
});

await viewer.load('https://example.com/document.pdf');

Serve the WASM file

Copy node_modules/@hyzyla/pdfium/dist/pdfium.wasm to your public folder and pass the URL:

new OsvViewer(el, { wasmUrl: '/assets/pdfium.wasm' });

Links

• Full documentation
• React component → @open-secure-viewer/react
• Office renderers → @open-secure-viewer/office
• IRM key exchange → @open-secure-viewer/irm
• GitHub

License

Apache-2.0