> ## Documentation Index
> Fetch the complete documentation index at: https://pdfitdown.eu/llms.txt
> Use this file to discover all available pages before exploring further.
# WebAssembly (WASM) API Usage
> Use PdfItDown in the browser via WebAssembly
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`](https://github.com/rustwasm/wasm-bindgen) and [`wasm-pack`](https://rustwasm.github.io/wasm-pack/).
## Installation
### Via npm
```bash theme={null}
npm install @cle-does-things/pdfitdown-wasm
```
### Via CDN (esm)
```html theme={null}
```
## Supported Formats
| Category | Formats |
| -------- | -------------------------------------------------- |
| 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) |
## API
All functions accept a `Uint8Array` of input bytes and return a `Uint8Array` of PDF bytes.
### General conversion
```javascript theme={null}
import init, { convert } from '@cle-does-things/pdfitdown-wasm';
await init();
const inputBytes = new Uint8Array(/* ... */);
const pdfBytes = convert(inputBytes);
```
### Specialized converters
If you already know the file type, you can call a dedicated converter for a slightly smaller WASM footprint:
```javascript theme={null}
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);
```
## Browser example
```html theme={null}
PdfItDown WASM DemoDownload PDF
```
## Build targets
The package ships three build flavours:
| Target | Use case |
| --------------- | ----------------------------------------- |
| `web` (default) | Native ES modules in the browser |
| `bundler` | Webpack, Vite, Rollup, etc. |
| `nodejs` | Node.js (if you prefer WASM over NAPI-RS) |
You can rebuild for a specific target from the monorepo root:
```bash theme={null}
cd packages/wasm
bun run build # web target
bun run build:bundler # bundler target
bun run build:nodejs # nodejs target
```