Source: https://restorebunny.com/tools/image-outline-extractor/

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# Image Outline Extractor

Extract high-contrast outlines with a Sobel edge detector. Adjust the edge threshold for a clean black-on-white line image.

Free · No signupFiles stay on your device

**Choose an image**Up to 4 MP / 20 MB per image

Edge threshold128

**Turn a photo into a finished artwork**

Explore watercolor, oil painting and pencil sketch styles in Photo Art Studio. One credit per generation.

[Open Photo Art Studio](<https://restorebunny.com/signup/?from=seo-content&source=%2Ftools%2Fimage-outline-extractor%2F&view=art>)

## How to use image outline extractor

1. Choose your local image and the task-specific settings below.
2. Create the result and inspect its details.
3. Download your file without creating an account.

## A practical example

A flat gray patch has no edge, while a sudden light-to-dark transition creates an outline. A higher threshold keeps fewer lines.

## Frequently asked questions

Are my files uploaded?

No. This utility runs in your browser. Your photos and settings are not sent for processing.

What should I check before using the output?

Pixel edges include texture and compression noise. This does not trace editable vector paths or identify objects.

## Keep working on your photo

- [All free image tools](<https://restorebunny.com/tools/>)
- [Prepare image dimensions](<https://restorebunny.com/tools/image-resize/>)

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By RestoreBunny · Reviewed 2026-10-25. Utilities use local calculations or [browser image processing](<https://developer.mozilla.org/en-US/docs/Web/API/Canvas_API/Tutorial/Pixel_manipulation_with_canvas>). The download button identifies the output format. Animated images export one decoded frame. Keep your original files.