Use JPG for photographs and simple sharing
JPG is widely supported and often produces compact photo files. It works well for camera images and general sharing, but repeated editing and saving can reduce quality because JPG uses lossy compression.
Use PNG when transparency or sharp graphics matter
PNG is useful for screenshots, logos, interface graphics and images that need transparent backgrounds. It can be much larger than JPG for photographs because it uses lossless compression.
Use WebP for modern web delivery
WebP can provide strong compression for both photographic and graphic content, and it supports transparency. Modern browsers handle it well, making it a practical choice for many websites.
Choose based on the destination
There is no single best format for every job. Pick the format that matches the platform, visual content and required compatibility. If you are publishing online, also resize oversized images before compression instead of relying on format conversion alone.
Final check
Online tools can save time, but the best result still comes from checking the output before you rely on it. Keep an original copy of important files and review any detail that matters to your work.