v1.0 Early Access

Document conversion APIs, built for developers

Convert HTML to PDF, URLs to PDF, PDF to HTML, and more with a clean document conversion API - without managing Chromium, Docker, or Gotenberg infrastructure.

First 1,000 conversions free for waitlist members at launch (no credit card required).

HTML to PDF API Example

REST API 
curl -X POST https://api.convertstack.run/v1/pdf \
  -H "Authorization: Bearer sk_test_..." \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Hello, PDF!</h1>"}'

Document Conversion API Features

aspect_ratio

Pixel-perfect rendering

Powered by a headless Chromium engine to ensure your CSS is respected exactly as designed.

webhook

Async jobs

Don't block your main thread. Trigger jobs and poll for results, or process synchronously.

redeem

Generous free tier

Every account gets a recurring monthly quota of free conversions to build and prototype with ease.

payments

Predictable pricing

Simple per-document pricing. No hidden fees, no complicated compute hour calculations.

speed

Built for scale

Queue-based processing with warm browser pools ensures low latency and high throughput.

forward

Migration-friendly

URL-to-PDF support makes switching from wkhtmltopdf and legacy services painless.

Engineered for the Modern Web

Legacy tools weren't built for Built for products that process documents at scale, from SaaS platforms and internal tools to AI workflows and enterprise applications.

Legacy Tools

  • close Slow wkhtmltopdf engines
  • close Unmaintained libraries
  • close Synchronous blocking requests
  • close Complex server management

ConvertStack API

  • check Evergreen Chromium Engine
  • check Async jobs by default
  • check URL and HTML rendering
  • check Zero-ops managed infrastructure

Document conversion FAQ

Answers about HTML to PDF, PDF to HTML, URL conversion, and the ConvertStack API.

What is ConvertStack?

ConvertStack is a developer-first document conversion API for HTML to PDF, URL to PDF, PDF to HTML, and other format conversions — without running your own Chromium or Gotenberg stack.

How do I convert HTML to PDF with an API?

POST your HTML to the ConvertStack API. We render it with headless Chromium and return a secure download URL for the generated PDF.

Does ConvertStack support PDF to HTML conversion?

ConvertStack is built as a document conversion platform. PDF to HTML is on the roadmap alongside HTML to PDF and URL to PDF conversion endpoints.

Is ConvertStack a wkhtmltopdf alternative?

Yes. ConvertStack replaces wkhtmltopdf and self-hosted Gotenberg with a managed API, modern CSS support, async jobs, and URL-to-PDF rendering.

Be first in line

Get early access to the ConvertStack API and claim your free 1,000 conversion credits.