About BGPeel

BGPeel is a free web tool that removes single-color backgrounds, such as magenta, green or white, and turns images into transparent PNGs. Images are never uploaded; everything runs inside the visitor's browser. It's built and run by one developer.

Why it exists

It started with monster art for a game. I generated dozens of monster sprites with an AI image generator, which didn't give me transparent backgrounds. So I did what many people do: generated them on magenta and removed that color.

The results from an image editor's color removal were unusable. A pink outline remained around each character, glowing characters kept a purple glow stuck to them like background, and the generator's sparkle mark sat untouched in the bottom-right corner. Widening the threshold just ate into the characters. One or two images I could touch up by hand, but not dozens.

So I wrote a script that calculates how much background color is mixed into each edge pixel, makes the pixel only that transparent, and subtracts the mixed-in color to restore the original. One rule at a time I added more: removing glows and marks connected to the background, and correcting yellows and oranges where the math tends to go wrong. It began as a Python script; BGPeel is that script moved into the browser so others can use it without installing anything.

Principles

• No uploads: background removal, resizing and format conversion all happen in the browser. Your images never leave your device and disappear when you close the tab.
• Free, no sign-up: no image limits and no watermarks. The site is supported by ads.
• One set of rules: images processed with the same settings are treated by the same rules, with sprite sets and animation frames, where results must match, in mind.
• A tool that explains itself: so you know what to change when automatic results fall short, every fine-tuning setting describes what happens when you raise or lower it.

About the guides

The guides document problems I ran into while building and using BGPeel. They're written from real AI-generated images processed with BGPeel and measured pixel by pixel. Where a test involved swapping a background or painting in a shadow, the article says so. Details that can change, such as other services' specs, note when they were checked. If you find a mistake, please tell me via Contact and I'll fix it.

Milestones

• September 26, 2026: BGPeel launched with solid background removal, folder upload, zip download, PNG/WebP/JPG export and a resize-only mode.
• September 28, 2026: Logo and icons.
• October 2026: Eleven test-based guides, plus About and Contact pages.
• October 20, 2026: iPhone HEIC support, a JPG/WebP quality setting, a 2048px size and two photo guides.

Get in touch

For bug reports, feature ideas or anything else, see the contact page and send an email. How personal information is handled is described in the privacy policy.