Some forms accept either a PDF or an image. They behave differently for size, multi-page documents, and acceptance. Here's how to choose.
When PDF wins
PDF is better for multi-page documents (everything in one file), for keeping text selectable, and because many official portals specifically expect PDFs.
When an image wins
A single photo or a simple one-page scan can be smaller as a JPG, and some image-only upload fields require it. If the form asks for a 'photo', use an image.
Converting between them
If you have images but need a PDF, combine them into one PDF. If you have a PDF but need an image, export the page as a JPG.
Step by step
- Check whether the form names a format. If it says PDF, that is the answer.
- For anything multi-page, choose PDF — one file, in order, is what a reviewer wants.
- For a single photograph or signature, an image is usually expected.
- Convert between the two rather than rescanning if you picked wrong.
What usually goes wrong
Multiple images where a PDF was wanted causes real problems
Pages arrive separately, out of order, sometimes with one missing. Reviewers reject these.
A PDF of one photograph is often refused
Photo and signature fields usually expect JPG. A PDF wrapper fails the check even though the content is right.
Converting changes the size
A JPG wrapped into a PDF grows slightly; a PDF page exported to JPG can grow a lot. Recheck against the limit after converting.
Frequently asked questions
Can I upload a multi-page document as an image?
Not as a single image — images are one page each. Use a PDF for multi-page documents.
Should I upload a PDF or a JPG?
Follow the form. As a rule: PDF for multi-page documents and certificates, JPG for photographs and signatures.
Can I convert a JPG to PDF for an upload?
Yes, and it is the right move when a multi-page document is wanted. It is the wrong move for a photo field that expects an image.