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Format
Convert an image to JPG
Anything your browser can decode goes in — PNG, WebP, BMP, GIF, even another JPEG — and JPEG comes out. Drop a whole folder's worth and they convert one after another.
Converted
What you gain and what you give up
JPEG is the most widely accepted image format there is. Every upload form, every printer, every ancient piece of software will take it, which is usually the reason people convert. It is also far smaller than PNG for photographic content, often by a factor of five or ten.
Two things are lost on the way in. Transparency, which JPEG has no concept of, so anything see-through gets filled with the colour you choose above. And a little detail, because JPEG is lossy by design. At 88% the loss is invisible on a photograph; on a screenshot full of text it is not, and you should stay with PNG.
Converting a PNG screenshot to JPG
You can, and the file will get smaller, but look closely at the text afterwards. JPEG spreads colour information across blocks of pixels, and hard black-on-white edges pick up a faint coloured halo as a result. If the screenshot is going into a document that will be read carefully, keep it as PNG and reduce the dimensions instead.
Common questions
Is there a difference between JPG and JPEG?
None whatsoever. The three-letter spelling is a leftover from the days when MS-DOS only allowed three characters after the dot. The files are identical.
How many files can I convert at once?
There is no hard limit, but everything happens in one browser tab using your own memory, so a few dozen photographs at a time is sensible. Very large batches of very large images can make the tab unresponsive while it works.
Why did my file get bigger?
That happens when the source was already a well-compressed JPEG and you converted it at a higher quality than it was originally saved at. Converting a JPEG to a JPEG is rarely worth doing.
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