ENPTES

Draw a Sobel edge outline of a photo

Pick light, medium or strong, then download PNG or JPG. Flat areas go dark and boundaries turn into lines. Width and height stay the same.

Runs in your browser Free No sign-up
  1. Choose file
  2. Set options
  3. Get result

Your file never leaves your device. Processed locally in your browser. Nothing is uploaded. Location and camera metadata (EXIF) are removed from the result.

A Sobel outline replaces the photo. Light multiplies the magnitude by 0.35. Strong paints white from 90 up. Width and height stay the same. PNG keeps transparency. JPG fills empty pixels with white. Camera location is not copied.

How to detect edges

1. Drop a photo you already have. A video or an audio file is refused here. 2. Leave medium, or pick light or strong. 3. Leave PNG, or pick JPG. 4. Press “Detect edges” and download.

GustKit runs a Sobel edge on the canvas. Light multiplies the magnitude by 0.35. Medium multiplies by 0.7. Strong paints white where the magnitude is 90 or more and black everywhere else. Width and height stay the same. PNG keeps transparency. JPG fills empty pixels with white. Camera location is not copied.

An outline, not a pencil sketch

Sketch image builds a gray pencil look and then darkens some edges. Sharpen image keeps the photo and only clears the boundary. This page replaces the photo with the edge outline. A short video belongs on Pixelate video, which saves MP4.

The photo stays in this tab

The canvas of this browser draws the outline. GustKit does not fetch a photo from a link. Close the tab and the file is gone. Photos up to the limit shown next to the button.

How to check the outline

1. Open the original and the download at the same zoom. 2. A hard boundary should turn light and a flat area should turn dark. Strong should look more black and white than light. 3. If the size changed, you opened a different page.

Sketch image keeps a pencil gray. This page draws a Sobel outline and saves PNG or JPG. Nothing is uploaded.

Frequently asked questions

A hard boundary turned white and the flat side stayed black. Did it work?

Yes. Strong paints white where the Sobel magnitude is 90 or more. Width and height stay the same.

Why is there no WebP?

This page saves PNG or JPG. Convert image is the page that writes WebP.

Can I detect edges and also sketch the photo in one step?

No. Detect the edges first, or sketch it first, then open the other page on the download.

Is the photo uploaded?

No. The outline is drawn in this tab.

The boundary is white and the flat side is black. Did it work?

Yes. Strong paints white where the Sobel magnitude is 90 or more. Width and height stay the same.

Can I detect edges and also add a glow in one step?

No. Detect the edges first, or add the glow first, then open the other page on the download.