Glossary
What is JPEG?
MarkdownWhat it is
JPEG removes detail that is hard to see to save space. A lower quality setting makes a smaller file with more visible artifacts.
Why it matters on a Mac
It opens in every app and website, so it is the safe format for sharing photos. Resaving a JPEG repeatedly can add more loss.
How to check or change it on macOS
In Preview, choose File > Export, pick JPEG and use the Quality slider to see the size change.
How Toolbox handles it
Convert Images turns HEIC, PNG and other formats into JPEG. Compress Images reduces size with Low, Medium or High quality and can save as JPEG or HEIC, in batches and on your Mac.
Frequently asked questions
Are JPG and JPEG different?
No. They are the same format with different extensions.
Does JPEG support transparency?
No. Use PNG, WebP or HEIC.
What quality should I use?
Medium to high suits most photos.
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