Trim Images Online

What Trim Image Does

Trim Image scans your picture's pixels from each of the four edges toward the center and finds where the uniform border stops and the actual subject begins. In Transparent mode it reads the alpha channel and walks inward, row by row and column by column, until it reaches a pixel that isn't fully transparent. In Background Color mode it compares every edge pixel's RGB value against a reference color — either sampled automatically with Auto-detect or set manually via Color to trim — and keeps walking inward as long as pixels stay within the Tolerance you've set, from 0 (only an exact color match counts as border) up to 255 (almost any color is treated as border). Once the scan stops on all four sides, those boundary lines define a bounding box, the canvas is cropped to it, and any Padding you've set is added back as margin on every side. What it won't do: clean up a border that isn't actually uniform. A gradient backdrop, a soft drop shadow, or JPEG compression noise near the edge won't collapse into one clean trimmed line — you'll get a partial trim or none at all depending on how high you push Tolerance. Edge Connected mode changes what counts as trimmable background in Background Color mode: instead of matching any pixel in the image against the reference color, it only removes background-colored pixels that are contiguously connected to the outer edge, so a patch of the same color sitting inside the subject — a highlight, an accent, a hole in the design — doesn't get chewed into by mistake. Everything here runs by reading canvas pixel data directly in your browser; the trim calculation itself never leaves your device.