Image transparency can disappear when a file is saved or passed through software that does not support it. The format and export path both determine whether transparent pixels survive.
What transparency is, technically
Every pixel in an image has color values; red, green, blue. Formats that support transparency add a fourth value, the alpha channel, which says how opaque that pixel is: 0 is fully invisible, 255 is fully solid, and everything in between is partially see-through. Partial transparency matters more than it sounds; it's what makes the edges of a cutout look smooth, because edge pixels blend gradually into whatever sits behind them.
Format support
- PNG; full alpha transparency. The default safe choice.
- WebP; full alpha transparency, smaller files, best for the web.
- SVG; transparent by nature; anything not drawn is simply empty.
- GIF; only all-or-nothing transparency per pixel, which is why GIF cutouts have hard, jagged edges. Avoid for this job.
- JPG; no transparency at all. The format has no alpha channel, so every transparent pixel must be flattened onto a solid color, usually white.
Saving a transparent image as JPG permanently replaces transparency with a background color. Converting that JPG back to PNG does not restore the alpha channel.
Where transparency silently dies
Messaging apps, email clients, social platforms, and clipboard operations may flatten images or convert them to JPG. Insert the PNG file directly when transparency matters. Check a corner against a dark background before using the result.
Halos and fringes: the other edge problem
Objects photographed on white can retain pale edge pixels after background removal. Cut slightly inside the edge and preview against light and dark backgrounds. The checkerboard in the editor marks transparent areas.
Making transparent images in the browser
The background remover provides erase and restore brushes for edge cleanup. The circle crop tool creates round images with transparent corners. Save the transparent master as PNG, WebP, or SVG. Make a separate JPG copy when a form requires it.