Photo or PDF? Choosing the format for document submissions
4 min read
When the submission rules name a format, follow them. The problem is “send it however” — and having one default rule removes the decision entirely.
The default is PDF
Think from the receiving side. Image files display at unpredictable sizes on different devices, lose their order when there are several, and print with no guarantee of layout. PDF has a page concept, which makes all three problems disappear.
With two or more pages, bundling into a PDF is close to basic courtesy: the difference between a clerk opening six attachments one by one, and paging through a single file in order.
The exceptions where a photo is right
Some apps and web forms accept only image uploads — typically where the system machine-reads the image, like ID verification. There, upload the JPG or PNG exactly as requested; wrapping it in a PDF can break the automated reading.
One or two pages where fine detail matters — small print on a receipt, say — are also better sent as the original photo, avoiding any recompression that conversion might introduce.
When you do convert photos to PDF
A phone photo dropped into a PDF as-is can run 5–10MB per page — a few pages and you're over most upload limits. Set the page size to A4 when converting, and if there's a quality option, the middle setting is usually the right balance of size and legibility.
It pays to shoot carefully in the first place: bright light, no shadow, the document filling the frame, camera square-on. A photo taken at an angle is still at an angle inside the PDF.
The last check before bundling
Before merging pages into one PDF, check three things: the order matches the document list in the submission guide, every page is upright, and no stray page (the same document photographed twice, say) slipped in.
Name the file so it identifies the person and contents — “JaneDoe_ProofOfResidence_plus3.pdf” — because the person receiving it gets dozens of files named “scan.pdf” every day.