The quick decision
Photos, portraits, travel shots, anything that should feel like it came straight from a camera → JPG (or WebP on your own site).
Logos, icons, UI screenshots, overlays, or anything that must stay sharp with transparent pixels → PNG (or WebP with alpha).
A portal demands JPG but your file has transparency → add a background color first, then convert. Never expect a direct PNG-to-JPG hop to guess the right fill.
When PNG earns its keep
PNG is lossless in typical use, which suits flat color, hard edges, and text. A settings-panel screenshot stays readable when someone zooms in.
The alpha channel matters for stickers, watermarks, and logos floating over photos — JPG simply has nowhere to store "see-through."
The trade-off is size on photographic content. Saving a beach sunset as PNG often produces a file several times larger than a reasonable JPG at similar viewing quality.
When JPG is the better tool
Lossy compression is tuned for continuous tones in photos. Email clients, social platforms, print kiosks, and countless upload forms still standardize on JPEG.
There is no transparency. When converters flatten alpha without a chosen background, semi-transparent pixels can land as muddy gray or solid black — that is a format limitation, not a bug in your file.
JPG is also a weak archive format for design work you will edit heavily later. Keep PNG, TIFF, or the native design source if pixels must survive round-trips.
Transparent PNG → JPG: fill before you export
The JPEG spec has no alpha channel. Every transparent pixel must become an opaque color — white is the usual default for documents, dark gray or brand navy for light logos on slides.
Use Transparent PNG to JPG to pick the fill explicitly instead of hoping an automatic conversion chooses well.
If edges look gray after export, check whether the PNG carried soft shadows or anti-aliased halos — sometimes a tighter crop or a flatter export from your design app fixes it faster than cranking compression quality.
Where WebP fits (without replacing the basics)
On a site you control, WebP often covers both "small photo" and "icon with transparency" in one format. If that is your world, read WebP vs AVIF vs JPG.
Our Compress PNG flow steers toward WebP because re-saving PNG rarely drops bytes in the browser — switching format usually does.
Convert with background fill
When a form only takes JPG but your logo has transparency, open [[transparent-png-to-jpg|Transparent PNG to JPG]] and pick a fill color first so you do not end up with a black matte.
Transparent PNG to JPG