Sobel Edge Detection
Highlight edges using the classic 3×3 Sobel operator.
How to Use
- Drop image.
- Pick threshold / invert.
- Download.
Notes
About the Sobel Edge Detection
Working on image, audio and file tasks? The Sobel Edge Detection is a free browser tool that gives you the answer in seconds. Highlight edges using the classic 3×3 Sobel operator.
How it works
Enter what you have and read the result as it updates live. It all runs on your own device, so it is quick and private, with nothing to install.
Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.
Frequently Asked Questions
Algorithm?
Sobel 3×3 X + Y gradients; magnitude = √(Gx² + Gy²).
How do I use the Sobel Edge Detection?
Simply type your numbers and read the result, which refreshes the instant you change something. There is nothing to submit and nothing to wait for.
Do I need to install or sign up for anything?
Not at all — it runs in the browser with nothing to install and no account. After it loads once, it even works without an internet connection.
Is my information private?
Yes. Everything happens in your browser. Nothing you type is sent to a server or saved anywhere.
Common Use Cases
Sketch effect
Line art from photo.
Last updated: