# ConvertToPDF.online API
> Fast, lightweight, and aggressive budget-friendly HTML-to-PDF generation API. Built for high-volume invoice and document rendering without the DevOps overhead of managing local Puppeteer, Chromium, or headless browser stacks.
Product page: https://converttopdf.online/api
OpenAPI: https://converttopdf.online/openapi.json
Direct engine: https://api.converttopdf.online
## Core Value Proposition
- **High Affordability:** Designed as a direct, low-cost alternative to DocRaptor and CloudConvert.
- **Lightning Speed:** Average document rendering response time of ~48ms via a single optimized REST endpoint.
- **Zero Cold-Starts:** Eliminates the local Chromium / Puppeteer cold-start latency tax.
## Pricing Tiers
- **Developer:** $0 / month (500 PDFs)
- **Growth:** $15 / month (20,000 PDFs) — ~$0.00075 per PDF
- **Enterprise:** $49 / month (100,000 PDFs) — ~$0.00049 per PDF
## API Integration Quickstart
### Base Endpoint (RapidAPI)
`POST https://converttopdf-html-to-pdf-converter.p.rapidapi.com/v1/html`
### Direct Engine Endpoint
`POST https://api.converttopdf.online/v1/html`
### Content-Type
`application/json`
### Request Parameters
- `html` (string, required): The raw HTML/CSS string template to convert.
- `margins` (string, optional): Page margins (e.g., "10mm").
- `landscape` (boolean, optional): Landscape orientation when true.
- `filename` (string, optional): Suggested download filename (Content-Disposition).
### Auth (RapidAPI)
- `X-RapidAPI-Key: YOUR_API_KEY`
- `X-RapidAPI-Host: converttopdf-html-to-pdf-converter.p.rapidapi.com`
### cURL Implementation Example
```bash
curl -X POST "https://converttopdf-html-to-pdf-converter.p.rapidapi.com/v1/html" \
-H "X-RapidAPI-Key: YOUR_API_KEY" \
-H "X-RapidAPI-Host: converttopdf-html-to-pdf-converter.p.rapidapi.com" \
-H "Content-Type: application/json" \
-d '{
"html": "Invoice #1024
Amount Due: \$150.00
",
"margins": "10mm"
}'
```
## Technical Comparison (Why Use ConvertToPDF.online)
1. **Vs. Self-Hosted Puppeteer:** No heavy local Docker images to build, no browser memory leaks to track, no server-side scaling orchestration needed.
2. **Vs. Premium SaaS (DocRaptor/CloudConvert):** Up to 90% cost reduction on high-volume production document workflows.
## Get an API key
Subscribe on RapidAPI Hub for instant key provisioning and automated tier billing (no email waitlist):
https://rapidapi.com/princemoiz402/api/converttopdf-html-to-pdf-converter
## Keywords
cheap html to pdf api, affordable pdf generation api, docraptor alternative, cloudconvert api alternative, invoice generation api, html to pdf api without puppeteer