PDF, JPG and PNG are not interchangeable formats. PDF is generally used for documents and fixed page layouts, while JPG and PNG are image formats. Choosing among them depends on what the file contains and what the recipient needs to do with it.
PDF is well suited to multi-page documents, forms, reports and files where page layout matters. It can contain text, vector graphics, images, links and other document features.
JPG
JPG uses lossy compression and is particularly effective for photographs and visually complex images. Repeated editing and saving can introduce compression artifacts, while text and sharp lines may not remain as clean as in a lossless format.
PNG
PNG uses lossless compression and is often a good choice for screenshots, diagrams, logos and text-heavy graphics. It can produce larger files than JPG when the image contains photographic detail.
Which format should you choose?
- Use PDF for multi-page documents and stable page layouts.
- Use JPG for photographs and compact photographic images.
- Use PNG for screenshots, diagrams and sharp graphics.
Quality versus file size
There is no universally smallest or highest-quality format. A text-heavy page can become a large JPG while a photograph can become a large PNG. Choose based on the visual content and the destination.
Conversion considerations
Converting a PDF page to an image removes much of the document structure and turns the page into pixels. Converting images to PDF can package those pixels into a document, but it does not automatically recreate editable text.
Practical decision
If someone needs to read and print a document, start with PDF. If someone needs an individual picture, choose JPG or PNG based on the image type and quality requirements.
Think about whether the file is a document or an image
If the recipient needs selectable text, multiple pages, links or document-style navigation, PDF is usually a better starting point. If the recipient needs one visual asset, JPG or PNG is often simpler.
Do not choose by file extension alone
Two files with similar dimensions can have very different sizes and quality depending on their contents and compression. Test the format with a representative file before converting a large collection.
Practical example
A three-page instruction sheet is better distributed as PDF because readers need the whole document and its layout. A photograph from that sheet is better shared as JPG. A screenshot containing small interface text is often better as PNG because its sharp edges survive lossless compression. The destination determines the appropriate format.