PDF vs JPG vs PNG: Which Format Should You Use?
Understand when PDF, JPG or PNG is the better choice for documents, photographs, screenshots and online submissions.
PDF, JPG and PNG can all contain visual information, but they are built for different jobs. PDF is a document container that can preserve pages, text, vectors and other structures. JPG and PNG are image formats. Choosing the right one affects file size, readability, editing options and what the recipient can do with the file later.
Use PDF when page structure matters
PDF is usually the best choice for multi-page reports, forms, invoices, manuals and documents that should look consistent when opened on different devices. A PDF can contain selectable text, vector graphics, images, links, annotations and metadata in one file.
If the recipient expects a document rather than an image, keep or create a PDF. Combining several photos into one PDF can also be more convenient than sending a folder of separate image files.
Use JPG for photographs and continuous-tone images
JPEG compression is designed for photographs and images with many color variations. It can produce small files, but it is lossy: repeated saving or aggressive quality settings can introduce visible artifacts around text and sharp edges.
JPG is a poor choice for screenshots dominated by text, line art or diagrams when clarity is critical. It also does not support transparent backgrounds.
Use PNG for screenshots, diagrams and transparency
PNG uses lossless compression and is well suited to interface screenshots, charts, logos and images with crisp edges. It can preserve transparency and generally keeps small text cleaner than a heavily compressed JPG.
The trade-off is file size. A photographic page saved as PNG can be much larger than a comparable JPG. For a PDF containing photo scans, converting every page to PNG may create very large downloads.
Converting a PDF page to an image changes the document
When you convert a PDF page to JPG or PNG, you create a visual image of that page. Selectable text, links, form fields and other PDF-specific structures are not preserved inside the image file. That can be exactly what you want for a preview or social upload, but it is not equivalent to keeping the original PDF.
Choose a sufficient render resolution for the intended use. A small web preview can use fewer pixels than a page that must remain readable when printed.
A practical decision rule
For a multi-page document, start with PDF. For a photograph, start with JPG. For a screenshot, logo or diagram with sharp edges, start with PNG. Convert only when the destination specifically benefits from another format.
Keep the original whenever the conversion removes useful structure. File-format conversion should create a new copy, not replace the best source available.