TRED - Where trusted car buyers and sellers connect
pdflayer - Free, powerful HTML to PDF API supporting both URL and raw HTML conversion. Unlimited document size, lightning-fast and compatible PHP, Python, Ruby, etc.
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PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
html2pdf.app - HTML to PDF conversion API
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents