Image Edge Detector
Extract contrast boundaries with an adjustable Sobel edge effect.
Drop your image here
Drag and drop, or choose a file below
JPG · PNG · WEBP
Up to 250 MB · One image at a time
Each image: up to 16 megapixels and 8192 px per side
Sobel gradients highlight contrast boundaries. Transparent neighbors are treated as white; the original alpha remains.
Exports a full-resolution PNG with transparency. PNG files can be larger than the original.
Original
Choose an image or try the sample to see your preview here.
100% local processing
How to use
- 01
Choose an image or try the local sample.
- 02
Set edge strength and choose light or dark lines.
- 03
Process, inspect the preview and download PNG.
Details and tips
How it works
Horizontal and vertical Sobel gradients measure local brightness changes. Transparent neighbors are composited on white for the calculation, and output keeps the source alpha.
Made for everyday images
Study outlines, compare image structure and create sketch-like graphic effects.
Frequently asked questions
Are images uploaded?
No. Processing and export happen on your device. Images are not saved to an account.
What are the limits?
Input supports JPG, PNG and WebP, up to 250 MB, 8192 px per side and 16 million pixels. Expanded output must also fit the pixel limits. Animated input is processed as a still frame.