Image BlurApply box blur to soften images with adjustable radius control.
Image Blur
Apply box blur to soften images with adjustable radius control.
Upload Your Image
Drop or select an image file to blur.
Set Blur Radius
Use the slider to adjust the blur intensity from subtle to heavy.
Apply and Download
Click Apply, preview the blurred result, and download.
What Is Image Blur?
An image blur tool softens an image by averaging neighboring pixel values using a convolution kernel. Box blur uses equal weights for fast, consistent results. This tool supports adjustable radius control so you can fine-tune the softening from a subtle haze to a heavy blur. Common uses include background softening for portrait-style depth of field, censoring sensitive information, and creating dreamy artistic effects. All processing is done client-side using Canvas API pixel manipulation.
Why Use Our Image Blur?
- Adjustable blur radius from subtle softening to heavy blur
- Box blur convolution for fast, consistent results
- Real-time preview of blur effect before downloading
- Client-side processing — images never leave your browser
Common Use Cases
Background Softening
Blur backgrounds to create depth-of-field portrait effects.
Privacy Protection
Blur faces, license plates, or sensitive information in photos.
Artistic Effects
Create dreamy, soft-focus effects for creative photography.
Thumbnail Backgrounds
Blur images for use as text overlay backgrounds in thumbnails.
Technical Guide
Box blur applies a convolution kernel where each element is 1/(size*size). For radius r, the kernel size is (2r+1)x(2r+1). Each output pixel is the average of all pixels within the kernel window. Edge pixels use reduced kernel areas.
Tips & Best Practices
- 1Use radius 1-3 for subtle softening, 5-10 for moderate blur, 15+ for heavy blur
- 2Blur is useful as a preprocessing step before adding text overlays
- 3Higher radius values take longer to process on large images
- 4Blurred images compress better because they contain less detail
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Image ToolsFrequently Asked Questions
QHow does blur radius affect the result?
QCan I blur just part of an image?
QDoes blurring reduce file size?
QCan I undo the blur?
About Image Blur
Image Blur is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.