This is the single most-searched PDF task there is, and it's usually someone photographing a document with their phone and needing it as a PDF for an application form. Those photos are personal — ID cards, bank statements, certificates — which makes uploading them to a converter a strange thing to have to do.
Drop the images in, set the order, choose a page size and margin, and download. The images are embedded at their original quality rather than re-encoded, so nothing is lost on the way in — which matters when the thing being photographed is a document someone is going to have to read.
You can fit each page to its image, or place everything on a consistent A4 or Letter page with a margin, which is usually what an application form is expecting. If the result is larger than whatever upload limit you're up against, run it through Compress afterwards rather than degrading the images going in.
Type into real form fields, or anywhere on a flat form.
Draw, type, or upload a signature and place it on any page.
Number the pages, with control over position and format.
Add DRAFT, CONFIDENTIAL or a logo across the pages.
Cut away white margins or crop pages down visually.
Combine files into one PDF and set the order before you merge.
Break a document into separate files by range or interval.
Drag pages into a new order, rotate or drop the ones you don't need.
Turn sideways or upside-down pages the right way up.
Pick pages to drop, visually or by range.
Keep only the pages you want as a separate file.