Blur Image
Apply adjustable Gaussian-like blur to your images directly in the browser. Upload an image, set the blur intensity, preview the result, and download the blurred image. Runs in your browser — images are never uploaded.
How Image Blurring Works
Image blurring softens an image by averaging each pixel with its neighbors, reducing sharp edges and fine details. This tool applies a Gaussian-like blur using the CSS filter property on the HTML5 Canvas. The blur radius determines how many surrounding pixels contribute to each output pixel. A larger radius produces a stronger, more diffused blur effect, while a smaller radius creates a subtle softening.
The CSS blur filter applied to the canvas context uses an optimized implementation built into the browser engine, which approximates a true Gaussian blur. This approach is fast and efficient, capable of blurring even high-resolution images in real time on modern devices. Because the entire process runs in your browser, your images remain completely private and are never sent to any external server.
Blur Parameters
Blur Radius: The number of pixels used for the blur kernel (1-50 px)
Gaussian Distribution: G(x,y) = (1 / 2πσ²) × e^(-(x²+y²) / 2σ²)
A blur radius of 5px produces a gentle softening suitable for reducing noise, while 20-30px creates a strong bokeh-like background effect.
Common Use Cases for Image Blurring
Blurring is commonly used to obscure sensitive information in screenshots such as email addresses, license plates, or personal details before sharing them publicly. It is also used for creating background effects in design projects, reducing image noise in photographs, generating placeholder images for lazy loading on websites, and creating depth-of-field effects for flat images.
Choosing the Right Blur Intensity
For privacy redaction, use a high blur radius (20-50px) to ensure text and details are completely unreadable. For artistic background effects, a medium blur (10-20px) creates a pleasant out-of-focus look. For noise reduction and subtle softening, a low blur radius (2-5px) is ideal. Always preview the result before downloading to ensure the blur intensity meets your needs.
Privacy and Security
All image processing happens entirely in your browser. Your files are never uploaded to any server, making this tool completely safe for personal photos, confidential business graphics, and sensitive documents.