Covert Image to pdf using pdf tool

Hi Team,

User fill the form and upload images from mobile or tab, The images size is more than 15 mb and i need to convert and merge in a pdf  with form data and images,When i am trying to convert images to pdf using plugin pdf tools(image to pdf) the server is getting heap memory and casuing down which leads to total env down, How can i achive this functionality of converting images to pdf

I see we have other plugins which will add images inside pdf but not at the end of the page,