Screenshot Machine - Screenshot machine is an online website capturing service. Creates a screenshot or thumbnail of any online web page in couple of seconds for free.
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.
URL2PNG - Screenshots as a Service. Capture snapshots of any website, right in your app, quickly and reliably.
PDFShift - Convert any HTML documents to high-fidelity PDF using a single POST request
ApiFlash - ApiFlash is a powerful serverless screenshot API built with Chromium and AWS Lambda. It can easily scale to millions of screenshots per day and has an ever growing number of satisfied big clients.
Tcpdf - TCPDF: Open Source PHP Class for generating PDF documents