The usual reason to have a stack of PNGs that need to be one PDF is screenshots — a bug report, a set of receipts, a chat thread, a step-by-step. Add them, put them in order, and they become a single document, one image per page.
This runs in your browser. The file is not uploaded, there is no account to create, and nothing is added to the document you download.
Also searched for: png to pdf, convert png to pdf, screenshots to pdf, multiple png to one pdf. It is the same tool whichever way you found it.
Need to change the settings? Turn images into a PDF is the same tool with every option open.
Yes. Add them all, drag them into the order you want, and they become a single PDF with one image per page. This is the usual way to turn a set of screenshots into one attachable document.
Transparency has to become something on paper, and it becomes white — a logo with a transparent background lands on white rather than on black. This is deliberate: the alternative, which some converters do, is to composite it onto black and ruin the image.
Yes. This page is titled for PNG because that is what most people arrive with, but the same tool takes JPG, WebP and the other common formats a browser can read, and you can mix them in one document.
No. The file is opened, changed and written by this browser tab — it is never sent to a server, so there is no queue to wait in and nothing to delete afterwards. Once the page has loaded you can turn the network off and the tool still works.