PDF vs JPG — Which File Format Should You Use?
Understand the key differences between PDF and JPG files, when each format is the right choice, and how to convert between them instantly online.
PDF and JPG are two of the most widely used file formats, but they serve fundamentally different purposes. Choosing the wrong format means text that cannot be selected, images that are blurry, files too large to share, or documents that render differently on every device. This guide explains what each format does and helps you decide which is right for your situation.
What is a PDF?
PDF stands for Portable Document Format. Created by Adobe in 1993 and now maintained as an open standard by the ISO, a PDF is a document container rather than an image. It can hold text, vector graphics, raster images, fonts, hyperlinks, interactive forms, and digital signatures — all packaged in a single file that renders identically on every device and operating system. Text inside a PDF is stored as actual characters, meaning it is selectable, searchable, and copyable. PDFs can be secured with passwords, and they are the standard format for legally binding digital documents.
What is a JPG?
JPG (also written JPEG) stands for Joint Photographic Experts Group. A JPG is a raster image file — a rectangular grid of pixels, each storing colour information. JPG uses lossy compression, which means it permanently discards some image data to achieve smaller file sizes. The amount discarded is controlled by the quality setting: at high quality (90%+), the loss is invisible to the human eye; at lower settings you may see colour banding, blurry edges, and blocky artefacts. JPG is optimised for photographs with smooth gradients and many colours.
When to Use PDF
Use PDF when the document must look identical on every device that opens it, regardless of screen size, operating system, or installed fonts. PDF is the right format for multi-page documents; official records and legal agreements; anything that will be sent to a printer or print shop; files that need to contain selectable, searchable text; documents requiring digital signatures or form fields; and anything where precise typography and layout must be preserved exactly as designed.
When to Use JPG
Use JPG when you are sharing a single visual image and file size matters. JPG is the right format for photographs and images with complex colour gradients; images uploaded to websites, social media, or digital galleries; email attachments where recipients do not need to select or copy text; thumbnails, preview images, and web graphics; and images that need to be opened on any device without a document viewer. JPG is the most universally compatible image format in the world.
Converting Between PDF and JPG
Converting a PDF to JPG gives you individual image files for each page — useful for editing in design tools, embedding in presentations, or sharing on social media. Converting JPG images to PDF creates a single shareable document — ideal for submissions, archives, and professional sharing. Both conversions can be done instantly and for free in your browser at 55pixel, with no uploads, no account required, and no software to install.