PNG to JPG: when smaller is the right call
Why PNG files get so big
PNG stores every pixel exactly. That is perfect for logos and interface graphics, but a full-screen screenshot or a photo can run to several megabytes. JPG trades a little invisible detail for a file that is often far smaller.
Choosing a quality value
The slider runs from 10 to 100. At 85, photos look the same to most eyes. Text screenshots are more demanding: use 90 or above so letters stay clean. Around 60 to 70 is for when an upload limit leaves you no choice.
Transparent areas turn white
JPG has no way to store transparency, so any see-through area is filled with white. For a logo going onto a white page that is fine. On a dark or coloured background, put the logo on that colour before you convert.
Forms, email and chat
Application portals, email attachments and messaging apps often set size limits. Converting screenshots and scanned documents saved as PNG is one of the quickest ways to get under them.
Things better left as PNG
Logos, icons, pixel art and images with large flat colours look worse as JPG and rarely shrink as much. Keep those as PNG.
Not sure which setting to pick? Convert at 85, check the file size, and only go lower if you really need to.