Why JPG is the safe choice
JPG is the most widely accepted picture format in the world. Almost every phone gallery, computer, printer, photo kiosk, social network and upload form opens it. When you have pictures in mixed or unusual formats — PNG, WEBP, HEIC, AVIF, GIF, BMP, TIFF, SVG or ICO — converting to JPG avoids most problems.
What happens when you convert
Each picture is opened in your browser and saved as a JPG. Transparent areas become white. The Quality slider (40–100, default 92) controls how much the picture is compressed, and the optional width box makes large pictures smaller while keeping their shape. Several pictures of different formats can be added together and downloaded at once.
Choosing quality and size
Quality 92 is visually lossless for almost all photos. Quality 80–85 makes much smaller files that still look good on phones and websites. For printing, keep the full width; for sharing online, a width of about 1600 pixels is plenty.
Common problems and how to fix them
A logo got a white box behind it: JPG cannot be transparent — use Image to PNG or Image to WEBP. Text in screenshots looks fuzzy: raise quality to 95, or keep screenshots as PNG. A file will not open: it may be damaged or a format your browser cannot decode.
Good habits
Keep original files for future editing, convert copies for sharing, and remove location data with Remove Image Metadata if privacy matters.