How this works
The document size you pick (e.g. 35×45 mm) is the exact size of the final merged sheet — not the photo's size plus a signature on top. A slice of that height, at least 5 mm and at most 30% of the total, is set aside for the signature; the photo fills whatever remains. DPI only changes the pixel resolution behind that same physical size (413×531 px at 300 DPI, 827×1063 px at 600 DPI, for 35×45 mm). Use the Upload Photo and Upload Sign buttons on the right to add a JPG or a PDF (its first page is used); drag either image to position it and use the corner handles to resize it — only the part inside its own area is kept. What you see in the frame is exactly what gets downloaded, as a JPG or a one-page PDF.
Common questions
Can I upload a PDF instead of a photo?
Yes — for either the photo or the signature. The first page of the PDF is rendered and used exactly like an uploaded image.
Does adding a signature make the output bigger than the size I picked?
No — the size you pick (e.g. 35×45 mm) is the final sheet's exact size. The signature's height is carved out of that total, capped at 30% of it, and the photo fills whatever height is left.
Why can't I set the signature's width separately?
The signature strip shares the photo's width so the two stack into a single clean sheet — only its height is adjustable, which is all official forms usually specify anyway.
What does the DPI setting change?
It sets the pixel resolution behind the physical size you picked — the sheet stays the same physical size either way, only the pixel count changes. 300 DPI is standard print quality; go higher for sharper prints at a larger file size, or lower for a smaller file.