JPG vs PDF: Which Format Should You Use?
A practical comparison of the two most common ways to share a document or an image, and which to pick for receipts, forms, photos and reports.
JPG and PDF get used interchangeably, which is why people end up emailing a twelve-photo receipt collection or a single-page PDF of a holiday snap. They solve different problems.
What a JPG is
A JPG is a grid of pixels — one image, no pages, no text. Its compression is lossy and tuned for photographs, discarding detail the eye is poor at noticing. That works beautifully on continuous tones like skin and sky.
It works badly on sharp edges. Text and line art develop visible fuzz around the strokes, and it gets worse every time the file is re-saved. A JPG also has no concept of pages, so multiple images means multiple files.
What a PDF is
A PDF is a page container. It can hold text as text, vector graphics as maths, and images as images, all with defined page dimensions. It is designed so a document looks the same wherever it is opened or printed.
That makes it the right choice for anything with pages, anything meant to be printed at a specific size, and anything where the text should stay selectable and searchable.
Choosing in practice
- A single photograph to share or post: JPG. Wrapping it in a PDF only adds overhead.
- Scanned receipts for an expense claim: PDF. One file, in order, that prints at a sensible size.
- A form someone must fill in and return: PDF. Fixed layout, and it can carry real form fields.
- A report or contract: PDF, always. Text stays searchable and pagination is preserved.
- A portfolio of images: PDF, so it stays in order as one document.
- An image for a website: JPG or WEBP. A PDF is not a web image format.
Converting between them
Use JPG to PDF to combine photos or scans into a single ordered document, choosing page size and margins to suit printing. Going the other way, PDF to JPG renders each page as an image, which is handy when you need a page as a picture for a slide or a message.