RemoveColor

Image format guide

PNG vs JPG: Which Format Supports Transparency?

PNG and JPG can both be useful source files, but they do not store the same information. The practical difference for color removal is simple: only PNG can retain transparent pixels in the final file.

01

The short answer

PNG supports an alpha channel, which can make each pixel fully opaque, fully transparent, or partly transparent. That is what allows soft edges around a logo, icon, or signature to sit cleanly over a new background.

JPG has no alpha channel. It is designed for photographic color data and stores every pixel as visible color. A JPG can be a useful input, but it cannot be the final format if you need real transparency.

  • PNG: use for transparent graphics, interface assets, logos, signatures, and sharp-edged artwork.
  • JPG: use for opaque photographs when a smaller file matters more than transparency.
  • WebP: RemoveColor can import it, but the exported result is still PNG to make the alpha behavior explicit.
02

What changes when you remove a color

RemoveColor compares pixels to the color you selected and lowers alpha for matches. Existing transparency in a PNG is retained: the tool can make a pixel less opaque, but it does not turn a transparent pixel back into a solid color.

With a JPG, the same process creates alpha from an originally opaque image. Compression may leave a slightly varied halo around a flat background, so it is normal to tune tolerance and Edge Softness before exporting.

03

Choose the source format for the job

If you are editing a logo, a UI asset, or a graphic that already has transparent padding, begin with the original PNG whenever possible. It keeps its dimensions and existing alpha instead of forcing the artwork onto a new background.

If the only source is a JPG, work from the largest available copy. A larger source gives the removal rule more faithful color information and leaves more room for a clean edge in the full-resolution PNG download.

04

Transparency cannot restore lost detail

Converting a JPG to PNG does not recreate detail that was removed by JPG compression, and removing a white field cannot separate a white object that shares the same color values. File format and color selection solve different problems.

Keep the original file, review the checkerboard preview, and download a PNG only after the transparent edge looks correct. The PNG is the output format; it is not a promise that every image can be separated by color alone.