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JPEG XL was built to replace both PNG and JPEG, and PNG to JXL is one of the conversions where it shows what it can do. The same picture typically lands well under what PNG needed, with nothing about the image itself changed.
On photographs and detailed artwork a saving of a third or more is ordinary. On a small flat graphic there is far less to win, since PNG is already efficient on that kind of image. The finished figure sits beside the original on every row, which is the only reliable way to know what your own files will do.
This is the catch, and it is a real one. Safari displays JXL, the other major browsers currently do not, and desktop software is a mixed bag. Sending someone a .jxl is a gamble. Keeping your own library in it, or serving it deliberately to Apple devices, is a different proposition.
Transparency, full colour depth and the exact dimensions. Nothing is discarded, which is what makes this a fair swap for PNG rather than the compromise you accept when converting to JPEG.
JXL encoding is genuine work and files are handled one after another. The first has to wait for the encoder to load before anything happens, so a long list is best started and left alone.
Lossless and smaller
The picture is untouched while the file itself shrinks.
Colour depth kept in full
Nothing about the range of shades in the PNG is trimmed on the way over.
Safari displays it natively
Apple browsers show a .jxl without any fallback image.
JPG to JPE Converter
Give your JPG photos the .jpe extension that a few strict systems ask for by name.
JPG to JIF Converter
Rewrite JPG photos as .jif files for the tools and validators that still use that spelling.
Image DPI Converter
Change the DPI stored in a JPG, PNG, TIFF or BMP, keeping either the pixels or the printed size.
PNG To ICO Converter
Turn a PNG into a ready-to-use ICO icon for your website favicon or a Windows shortcut. Free and handled entirely in your browser.
Lossless from a PNG, which is why the picture comes out identical. The format can work either way, and this direction keeps everything.
Only with a fallback. Most visitors are on browsers that will show nothing at all for a .jxl, so WebP or AVIF is the safer choice today.
Recent versions of a few image editors and viewers, plus macOS itself. Older software will report the file as unreadable rather than showing anything.
By name and by committee, not by compression. It is a newer design that happens to carry the JPEG label, and old JPEG software cannot read it.