What is the best png to jpg converter without losing quality?

NConvert is XnSoft's dedicated command-line image converter. It's lightweight, free for non-commercial use, and supports batch processing with fine-grained quality control.

nconvert -out jpeg -o output.jpg input.png

Batch example of png to jpg conversion:

nconvert -out jpeg *.png

A few things you should pay attention to when using this free png to jpg converter on Windows:

• The -out flag sets output format, not output path — a common point of confusion. Use -o for the output file/path.
• Default JPEG quality may not match what you'd get from a GUI tool — explicitly set quality with a flag like -q 90 rather than relying on defaults, especially if file size or visual fidelity matters.
• Wildcard patterns (*.png) depend on your shell — PowerShell, Command Prompt, and Bash can expand wildcards differently, so verify the exact files being picked up before running on a large folder.