How to apply box blur to an image?

Select your file and set the blur radius — larger values produce stronger softening.

What is the difference between box blur and Gaussian blur?

Box blur averages all pixels in a region equally; Gaussian blur weights nearby pixels more heavily, producing smoother, more natural softening.

When should I use box blur?

For quick softening or noise reduction where smooth gradients are not critical, or when processing speed matters more than quality.

What file formats can I export?

You can export as PNG, JPEG, WebP, TIFF, BMP, or HEIC.

Is this tool free to use?

Yes — completely free, no account needed. Your images are processed entirely in your browser and never uploaded to a server. Downloads have no watermarks.

BrushCue Tool

Apply Box Blur to Image Online

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What you can expect

This online Box Blur tool applies a simple averaging filter to soften an image and reduce noise. It is fast and predictable, making it useful for quick previews, testing, or educational purposes. Under normal circumstances, use the Gaussian Blur tool instead for smoother, more natural-looking results.

Related tools

More BrushCue tools that fit this workflow.

See all tools →

Gaussian Blur

Apply Gaussian blur to images in your browser. Soften details, create depth effects, or prepare backgrounds quickly and for free.

Median Filter

Runs a median filter over the composition. This will accumulate the R, G and B components of your image and then calculate the median of each component. Valid range for the kernel size is between 1 and 5. Use this tool to remove noise from an image.

Sharpen

Sharpen your images instantly with this browser-based sharpening tool. Enhance edges, boost clarity, and bring out fine details to make photos look crisp and focused. Adjust the strength to control how subtle or intense the sharpening effect appears, whether you’re refining portraits, improving product shots, or restoring slightly soft images—all without leaving your browser.

Zoom Blur

Zoom Blur simulates the effect of a camera zooming during exposure, creating streaks that radiate outward from a specified center point. The center remains relatively sharp while surrounding areas blur along radial lines. The strength parameter controls how pronounced the motion and streaking appear.

Camera Moving Distortion

This tool simulates the effect of camera movement during a photo capture. It overlays two instances of the same image and blends them using a configurable alpha value to produce the effect. You can control both the blending strength and the positional offset between the two overlays to introduce subtle motion, depth, or a sense of energy—useful for adding realism, emphasizing motion, or creating a more dynamic, cinematic feel in otherwise static images.

Frequently asked questions

How to apply box blur to an image?: Select your file and set the blur radius — larger values produce stronger softening.
What is the difference between box blur and Gaussian blur?: Box blur averages all pixels in a region equally; Gaussian blur weights nearby pixels more heavily, producing smoother, more natural softening.
When should I use box blur?: For quick softening or noise reduction where smooth gradients are not critical, or when processing speed matters more than quality.
What file formats can I export?: You can export as PNG, JPEG, WebP, TIFF, BMP, or HEIC.
Is this tool free to use?: Yes — completely free, no account needed. Your images are processed entirely in your browser and never uploaded to a server. Downloads have no watermarks.

For developers

Use Box Blur from Python

Open the Jupyter notebook example to see how to run this tool from the BrushCue Python API, inspect the processing steps, and adapt the workflow for scripts or batch image jobs.

View Python notebook

Build your own

Apply Box Blur to Image Online

What you can expect

Frequently asked questions

Use Box Blur from Python

Create projects with your custom presets