Image Blur Detector
Analyze images for blur using Laplacian variance, entirely in the browser.
Privacy first: Your files never leave your browser. All processing happens locally on your device.
Drop an image here or browse
PNG, JPEG, WebP, AVIF — max 50 MB
Analyzes blur using Laplacian variance.
Frequently Asked Questions
How does blur detection work?
The tool converts the image to grayscale and applies a Laplacian kernel to detect edges. The variance of the Laplacian response indicates how much edge information exists — lower variance means blurrier.
What is a good Laplacian variance value?
Values above 500 generally indicate acceptable sharpness. Below 100 is typically very blurry. The thresholds can vary by image content.
Is my image uploaded anywhere?
No. All analysis is performed locally in your browser using the Canvas API.