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The @cle-does-things/pdfitdown-wasm package lets you run PdfItDown directly in the browser through WebAssembly. It is built from the pdfitdown-wasm Rust crate using wasm-bindgen and wasm-pack.

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Installation

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Via npm

npm install @cle-does-things/pdfitdown-wasm

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Via CDN (esm)

<script type="module">
  import init, { convert } from 'https://cdn.jsdelivr.net/npm/pdfitdown-wasm@4.0.0/pdfitdown_wasm.js';
  await init('https://cdn.jsdelivr.net/npm/pdfitdown-wasm@4.0.0/pdfitdown_wasm_bg.wasm');
  // ... use convert()
</script>

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Supported Formats

CategoryFormats
Markup.md, .html, .htm
Office.docx, .xlsx, .pptx
Images.png, .jpg, .jpeg, .webp, .tiff, .avif
Text.txt, .csv, .xml, .json, and more
Other.pdf (pass-through)

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API

All functions accept a Uint8Array of input bytes and return a Uint8Array of PDF bytes.

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General conversion

import init, { convert } from '@cle-does-things/pdfitdown-wasm';

await init();

const inputBytes = new Uint8Array(/* ... */);
const pdfBytes = convert(inputBytes);

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Specialized converters

If you already know the file type, you can call a dedicated converter for a slightly smaller WASM footprint: 
import init, {
  convertImage,
  convertMarkup,
  convertOffice,
  convertText
} from '@cle-does-things/pdfitdown-wasm';

await init();

const imagePdf = convertImage(imageBytes);
const markupPdf = convertMarkup(markdownBytes);
const officePdf = convertOffice(docxBytes);
const textPdf = convertText(txtBytes);

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Browser example

<!DOCTYPE html>
<html>
<head>
  <title>PdfItDown WASM Demo</title>
</head>
<body>
  <input type="file" id="fileInput" />
  <a id="download" style="display:none">Download PDF</a>

  <script type="module">
    import init, { convert } from '@cle-does-things/pdfitdown-wasm';

    await init();

    document.getElementById('fileInput').addEventListener('change', async (e) => {
      const file = e.target.files[0];
      const bytes = new Uint8Array(await file.arrayBuffer());
      const pdfBytes = convert(bytes);

      const blob = new Blob([pdfBytes], { type: 'application/pdf' });
      const url = URL.createObjectURL(blob);

      const link = document.getElementById('download');
      link.href = url;
      link.download = file.name.replace(/\.[^.]+$/, '.pdf');
      link.style.display = 'inline';
      link.textContent = 'Download PDF';
    });
  </script>
</body>
</html>

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Build targets

The package ships three build flavours:
TargetUse case
web (default)Native ES modules in the browser
bundlerWebpack, Vite, Rollup, etc.
nodejsNode.js (if you prefer WASM over NAPI-RS)
You can rebuild for a specific target from the monorepo root: 
cd packages/wasm
bun run build          # web target
bun run build:bundler  # bundler target
bun run build:nodejs   # nodejs target