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Contour Detection — Free Online Tool | Pixlane
Identify and draw contours around objects in any image. Useful for shape analysis, object counting, and boundary visualization.
Find and draw contours around objects — outline shapes and regions in images.
All processing runs locally in your browser. Your files never leave your device — no upload, no server, no signup required.
Frequently Asked Questions
What is contour detection?
Contour detection finds continuous curves that form the boundaries of objects in an image. It is used in shape analysis, object counting, gesture recognition, and industrial inspection.
What is the difference between external and all contours?
External mode detects only outermost contours (no nested boundaries). All mode returns every contour including holes. Tree mode preserves the parent-child hierarchy.