What makes PNG lossless
PNG compresses pixels without throwing any of them away. Repeatedly opening, editing, and saving a PNG does not erode image quality the way it does with a JPEG.
That accuracy comes with a cost. Continuous-tone photographs rarely shrink far in PNG, so photo files are usually much larger than the same picture saved as JPEG.
Transparency and sharp edges
PNG stores an alpha channel, so a pixel can be fully opaque, fully transparent, or anything in between. Soft edges around cutout objects and rounded corners therefore stay smooth instead of turning jagged.
Hard edges benefit too. Text, line art, and flat-color logos keep crisp boundaries because the format does not smooth detail across pixel blocks.
- Logos, icons, and interface graphics
- Screenshots with small text
- Cutout images that need transparent backgrounds
- Artwork with flat colors and sharp lines
Converting and compressing PNG files
Filekind converts PNG to JPEG, PNG to WebP, and back again in the browser. Converting to JPEG shrinks photos quickly, but transparent areas are filled with white because JPEG cannot store transparency.
The compressor also accepts PNG input and writes JPEG output at or below your chosen KB or MB limit. Inputs up to 25 MB, 16,000 pixels per side, and 48 megapixels are supported. Everything runs locally, so a folder of screenshots can be handled one file at a time without any upload.