JavaScript & TypeScript In-Browser WASM Engine
Embed client-side PDF to Markdown conversion in your web apps. High-performance WebAssembly with Web Worker sandboxing and real-time streaming.
Live JavaScript Web Worker Sandbox
100% In-Browser Conversion — Your Files Are Never Uploaded
Drag & Drop your PDF document here
or browse files on your device
NPM Installation
TypeScript / Web Worker Implementation
import { initPdfConverter } from '@pdftomarkdown/wasm';
// Initialize non-blocking WASM worker
const converter = await initPdfConverter({
workerUrl: '/workers/pdfConverter.worker.js',
onProgress: (page, total) => {
console.log(`Processing page ${page} of ${total}...`);
}
});
// Convert File / ArrayBuffer from drag-and-drop input
async function handleFileUpload(file: File): Promise<string> {
const arrayBuffer = await file.arrayBuffer();
const markdown = await converter.convert(arrayBuffer, {
extractTables: true,
mathDelimiters: 'dollar',
mode: 'gfm'
});
return markdown;
}Frequently Asked Questions
Everything you need to know about format extraction, privacy, and markdown compatibility.
Can I run this WebAssembly converter inside modern frontend frameworks like React, Next.js, and Vue?
Yes. The `@pdftomarkdown/wasm` package works seamlessly with React, Next.js, Vue, Nuxt, Svelte, and vanilla JavaScript. It runs inside a dedicated Web Worker so the main UI thread never drops frames during conversion.
Does it require Node.js or server-side rendering?
No. The WASM module compiles directly to client-side WebAssembly and executes locally inside any evergreen browser (Chrome, Firefox, Safari, Edge) without making a single backend API call.
How does it handle memory management for large PDF files?
The library utilizes transferable `ArrayBuffer` instances between the UI thread and Web Worker. Memory is allocated within a linear WASM page buffer and freed immediately upon page emission, keeping heap usage under 35 MB even for 200+ page documents.
Is streaming progress supported?
Yes. The worker posts `{ type: 'PROGRESS', page: current, totalPages: total }` events as each page completes, enabling rich real-time progress bars and streaming UI previews.
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