JPG — JPEG Image
JPG (or JPEG, for the Joint Photographic Experts Group that created it in 1992) is the world's most widely used photo format. It achieves small file sizes through lossy compression: it permanently discards visual detail the human eye is least likely to notice.
Every digital camera and phone shoots JPG (or its modern successor HEIC), and every device on earth displays it.
What JPG files are used for
- Photographs — the format was literally designed for them
- Web images where transparency isn't needed
- Email attachments and messaging, where size matters
Advantages
- Small files for photographic content
- Universal compatibility — the safest image format to send anyone
- Adjustable quality/size trade-off
Limitations
- Lossy: every re-save at lower quality degrades the image further
- No transparency support
- Poor at sharp edges — text and flat graphics get visible artifacts
- EXIF metadata can leak location and device details if not stripped
How to open a JPG file
Everything opens JPG files — browsers, photo viewers, editors, office software. The more common tasks are converting: to PNG for lossless editing, or to WEBP for smaller web-ready files.
Frequently asked questions
Are JPG and JPEG the same thing?
Yes, exactly the same format. JPEG is the name of the standard (from the Joint Photographic Experts Group), and .jpg is the three-letter extension older Windows versions required. A .jpg and a .jpeg file are interchangeable; renaming one to the other changes nothing.
Which has better quality, JPG or PNG?
PNG is lossless, so it keeps every pixel exactly. JPG is lossy and discards fine detail to make files much smaller. For photos the difference is usually invisible and JPG is the better choice. For screenshots, text, logos and anything with sharp edges, PNG looks noticeably cleaner.
Does a JPG lose quality every time it is saved?
Only when it is re-encoded. Opening, viewing and copying a JPG costs nothing, but editing and saving it again recompresses it, and repeated saves add visible artifacts. Keep an original and export a fresh JPG from it rather than editing the same JPG over and over.
Can a JPG have a transparent background?
No. JPG has no transparency channel, so transparent areas are filled with a solid color, usually white or black. For a transparent background use PNG or WEBP.
How do I turn a JPG into a PDF?
Upload it to the JPG to PDF converter and download the PDF. To combine several photos into one PDF in a chosen order, use the Image to PDF tool.