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PNG to JIF makes a JPEG and gives it the .jif ending. JIF stands for JPEG Interchange Format, the name the standard carried when it was published in 1992, and it survives today mostly inside software old enough to remember that.
The original rules left too much undecided, so in practice almost every JPEG ever written follows the JFIF revision instead. The name lingered in a few file type lists while the format itself moved on, which is why a system can still ask for a .jif and be perfectly satisfied with an ordinary JPEG inside.
Two things. Transparency goes, replaced by white, because JPEG has no way to record a clear pixel. And the compression drops fine detail to save room, which you will not notice on a photograph and may well notice on a screenshot of small text.
Line art, logos, anything with sharp edges against flat colour, and anything you intend to edit again later. PNG holds all of that without loss. Convert when something has asked for the .jif by name, not as a general tidy up of a folder.
Accepted by old file type lists
Systems that will only take .jif get exactly what they asked for.
Photographs compress hardest
The busier the picture, the more room JPEG compression saves on it.
Colour and dimensions unchanged
Only the compression and the ending differ from the PNG you put in.
PNG to JFI Converter
Produce .jfi files from PNG images for systems that match on that exact extension.
PNG to DIB Converter
Write PNG images out as .dib bitmaps for Windows software that expects raw pixel data.
PNG to CUR Converter
Turn PNG artwork into .cur files, the format Windows uses for mouse pointers.
PNG to TIF Converter
Convert PNG images into .tif files for printing, scanning workflows and long term storage.
On paper yes, in practice no. JFIF was the revision that pinned down what JIF left vague, and every JPEG you meet follows it.
Different thing entirely. JIF here is a JPEG file, unrelated to GIF beyond three letters that look similar.
Usually, since it reads the contents rather than trusting the name. Simpler viewers are more likely to refuse on the extension alone.
Less well than a photo. Sharp black text on white is exactly the pattern JPEG compression struggles with, and faint smudging appears around the letters.