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PNG is the right choice when your JXL image has transparency or you need lossless edges - for logos, screenshots or graphics. Unlike JXL, PNG is opened by every browser and program.
The JXL is decoded locally with a self-hosted codec and exported as PNG; transparency is fully preserved. Nothing is uploaded.
In practice it tends to go like this: someone sent you a JXL file, but your image program or operating system only shows a grey placeholder icon. Instead of hunting for a special plugin, you convert the file here into an ordinary PNG that opens in any software, any presentation and on any website. Because the export is lossless, you get exactly the pixels stored in the JXL - a safe waypoint before you edit or archive the image.
If your JXL comes from an older photo library or an experiment with the new format, this conversion bridges exactly the gap created by its scarce adoption. Should you drop an animated JXL, only the first full frame is saved honestly, because a classic PNG knows no moving still image.
Limitations: PNG files are larger than JXL, especially for photos. For small photo files, JXL to JPG is a better fit. Animated JXL is converted as the first frame. Embedded metadata such as capture date, camera and GPS location does not survive the re-encode - only the image orientation is baked into the pixels beforehand. The output is 8-bit sRGB; a 10-bit or HDR JXL source is brought down to 8 bits per channel in the process.