Librarycrates.io
Rust
The full API: byte output, writers, async file conversion, local resources, and opt-in remote fetching.
Start with RustOne engine, nine paths
Your first PDF.
Your runtime.
Pick the environment you already ship. Every guide starts from a clean project, produces a real PDF, then explains configuration, resources, lifecycle, and runtime limits.
Native entry points
Run inside your application.
Use native bindings when your service needs in-process execution, explicit ownership, and packaged platform libraries.
Binarycargo install
Command line
Convert HTML or Markdown files from a shell, a script, or standard input without writing application code.
Start with the CLINative ABIGitHub Releases
C
Link a versioned static or shared library through opaque handles, stable status codes, and explicit ownership.
Start with CBindingPyPI
Python
Install an ABI3 wheel and receive Python bytes from a native Rust renderer on Linux, macOS, or Windows.
Start with PythonBindingNuGet
.NET
Install one managed package with its native library for Linux, macOS, or Windows.
Start with .NETBindingMaven Central
Java
Use a Java 17 facade with deterministic ownership and native libraries for five platforms.
Start with JavaBindingRubyGems
Ruby
Use an idiomatic chainable converter backed by the same native Rust engine and package contract.
Start with RubyPortable WebAssembly
One npm package, two hosts.
Browser and Node.js use the same WebAssembly renderer. Supply fonts and document resources as bytes from the host application.
Client sideironpress
Browser JavaScript
Initialize the WASM module, render locally, and turn the returned Uint8Array into a Blob for download or preview.
Start in the browserServer sideironpress/node
Node.js
Use the package-owned WASM asset from Node.js 22 or 24 with ESM and write the returned Uint8Array where you need it.
Start with Node.jsChoose by capability
The important differences.
All paths render HTML and Markdown with reusable converter settings. Host integration is what differs.
| Capability | Rust | CLI | C | .NET | Java | Python | Ruby | WASM |
|---|---|---|---|---|---|---|---|---|
| PDF bytes | Yes | File | Yes | Yes | Yes | Yes | Yes | Yes |
| Local resources | Yes | Yes | Host bytes | Host bytes | Host bytes | Yes | Yes | Host bytes |
| Direct file output | Yes | Yes | No | No | No | Yes | Yes | No |
| Streaming or async | Yes | No | No | No | No | No | No | No |
| Remote HTTP | Opt-in | No | No | No | No | No | No | No |