Api2Pdf is a powerful PDF generation API with no rate limits or file size constraints. Generate PDFs from HTML, URLs, images, and office documents. Merge PDFs. Api2Pdf runs on AWS Lambda making it extremely reliable and the most affordable PDF service around. The REST API supports wkhtmltopdf, Headless Chrome, LibreOffice, and PDF Merge. Wkhtmltopdf and Headless Chrome have advanced formatting options available. See our website for details.