Auto-trim
Drop PNGs with transparent borders and the tool finds the tight bounding box around opaque pixels and crops to it. Perfect after compositing in another tool, or for trimming exported assets that came with extra padding.
Drop PNG files here
Multiple files allowed
When to use this tool
Anytime an image has unnecessary transparent space around its content — exported icons, signatures, sprite frames, screenshots saved with extra canvas. Auto-trim finds the rectangle of actual pixels and discards the rest.
Threshold
The threshold controls how transparent a pixel must be to be considered "empty." 0 (default) means any non-zero alpha counts. Bump it up if your image has faint edge anti-aliasing pixels you also want to trim.
Use cases
- Icon export. Trim padding that an export pipeline left around the icon.
- Sprite frames. Tighten each frame so the sheet packs efficiently.
- Signatures. Photographed signature with lots of background — make the background transparent first via Background, then auto-trim.
- Stickers. Cut a stack of die-cut stickers from a scan.
FAQ
What if my image is fully opaque?
Nothing changes — the bounding box is the whole image. The output is the same dimensions as the input.
What if my image is fully transparent?
The tool reports "all transparent — nothing to trim" and skips that file.
Does it preserve the actual content?
Yes — only fully-transparent (or below-threshold) edge pixels are dropped. Interior content is unchanged.