PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
MJML - The open source framework for responsive emails
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Api2Pdf - PDF Generation API, powered by AWS Lambda. HTML to PDF | URL to PDF | Office Doc to PDF | Merge PDFs . Supports wkhtmltopdf, Headless Chrome, and LibreOffice. No rate limits and no file size limits.
Elite Email - Drag & drop email builder for awesome newsletters