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Blur Image Online

Last updated: June 18, 2026

Written by Blake Boege · Founder, Calculator Answers

An image blurring utility is a visual effect filter that applies a Gaussian-like smoothing filter to a raster image. Operating client-side, it leverages canvas filter APIs or pixel kernel convolution matrices to blur detail layers, locking the blurred pixels into a new downloadable image.

Apply a smooth blur effect to your photos with an adjustable intensity slider. Private browser-based processing.

See also: PNG to PDF, Rotate PDF, and Crop PDF.

Quick Answer

Add a blur filter to your photos. Use the slider to set custom blur intensities, preview the results, and download.

Drag and drop your files here, or browse

Supports PNG,JPEG,WEBP files up to 15MB

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Examples

Soft focus effect

Background image → Soft-focused background (3px to 5px blur)

Heavy privacy blur

Sensitive screenshot → Fully obscured information (20px to 30px blur)

How it works

This tool applies a Gaussian-like smoothing filter to your graphics using standard HTML5 Canvas 2D filters.

Once you upload a photo, it is drawn onto an in-memory canvas. Before painting the pixels, the canvas context filter property is configured:

ctx.filter = 'blur(' + blurPx + 'px)'

The browser's native engine handles the pixel convolving math, creating a smooth blur effect. The output canvas is then exported directly to an image blob for downloading locally.

Completely Local. Your photos are rendered in-browser. No uploads or telemetry tracking.

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Frequently asked questions

Select your image file, adjust the blur slider to your preferred radius (from 1px to 40px), preview the blurred result in real-time, and click the Blur Image button to save.

No. The entire filter effect is calculated client-side in your web browser using HTML5 canvas. Your photos never leave your device.

Yes. The uploader includes a precise pixel slider that allows you to apply anything from a subtle soft focus (1-3px) to a completely obscured blur (20-40px).

You can upload and blur PNG, JPG, JPEG, and WebP images. The output is downloaded in the same format you uploaded.

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