JPG Converter
JPG is the format that opens everywhere. Nearly thirty years of universal support make it the safe default for sharing photographs, at the cost of lossy compression that discards detail on every save and no support for transparency.
JPG at a glance
| Full name | Joint Photographic Experts Group |
|---|---|
| Extension | .jpg |
| MIME type | image/jpeg |
| Compression | Lossy |
| Transparency | No |
| Animation | No |
| Colours | 16.7M (24-bit) |
| Browser support | All browsers, all devices |
| Typical use | Photos, web images, email attachments |
| Introduced | 1992 |
Convert JPG to another format
Create JPG from another format
More about JPG
Still stuck? Try the help centre or the FAQ.
Already have JPG files that are too large? Compress JPG instead of converting.
JPG questions
Is there any difference between .jpg and .jpeg?
None at all in the file. The three-letter extension survives from MS-DOS, which allowed no more, and both name the same JPEG format with the same MIME type. KoalaPic accepts .jpg, .jpeg and the Windows .jfif spelling interchangeably.
Does re-saving a JPG make it worse every time?
Yes, if the pixels are re-encoded. Each JPG save quantises the image again and the losses accumulate, visibly around text and hard edges after several rounds. Rotating by exact quarter turns can be done losslessly, but any edit that changes pixels cannot.
What quality setting should I use for JPG?
85 is the usual sweet spot: the difference from 100 is invisible in normal viewing while the file is a fraction of the size. Drop to 75 for thumbnails and previews, and stay above 90 only for images that will be edited again.
Why does my JPG have a white background instead of a transparent one?
JPG has no alpha channel, so transparency cannot be stored. Anything transparent in the source is composited onto a solid colour, white by default. Save to PNG, WEBP or AVIF if the background needs to stay see-through.