Does converting an image reduce its quality?

Whether image conversion reduces quality depends on the formats involved. Converting between lossless formats like PNG to PNG preserves quality perfectly. Converting PNG to JPG (a lossy format) reduces quality because JPG compression permanently discards some visual data to achieve smaller file sizes. Converting JPG to PNG does not reduce quality further — you get the exact same image data in a larger file. The good news is our image format converter lets you control quality with a slider, so you can balance file size and visual fidelity. For photos and web use, setting quality to 80% typically creates files 50-70% smaller with no visible quality loss. For preserving every detail, use lossless formats like PNG.