JPG File

What is a JPG file?

A JPG file (also written as JPEG) is a compressed raster image format designed for photographs. It reduces file size using lossy compression, which makes it great for sharing photos, but repeated re-saves can reduce quality over time.

Common uses

• Photos from phones and cameras
• Web images where smaller size matters
• Social media uploads and sharing
• Email attachments and quick previews
• Photo archives (with reasonable quality settings)

How to open a JPG file

• Windows: Photos app, browsers, image editors
• macOS: Preview, Photos, browsers
• Mobile: Built-in gallery/photos apps
• Edit: Photoshop, GIMP, Affinity Photo, Lightroom (varies)

Common problems

• Compression artifacts (blocky edges, smeared details)
• Quality loss after repeated editing and saving
• Color profile differences between apps/devices
• Not ideal for transparency (use PNG instead)
• Corruption from incomplete uploads/downloads

History

JPEG was developed in the late 1980s and became one of the most widely used photo formats on the web because it compresses images efficiently. Even with newer formats available, JPG remains extremely common due to universal support across devices and platforms.