Blur Images
Blur images online for free with an adjustable radius. Soften backgrounds or obscure sensitive details in your browser, no uploads, fully private.
About This Tool
Apply a smooth blur to an image with an adjustable radius. Useful for softening a busy background, obscuring a face or license plate for privacy, or creating a soft-focus effect. The blur radius slider controls the strength, from a subtle softening to a heavy, fully obscured blur. Processing happens entirely in your browser.
How To Use
- Drop your images into the upload zone or click to select files from your device.
- Adjust the blur radius slider until you get the effect you want.
- Click "Blur" and each image is processed in your browser.
- Download your blurred images individually or as a ZIP.
How It Works
Blurring uses the Canvas API's built-in filter support, drawing the image through a Gaussian blur filter at the radius you choose. This is the same blur algorithm used by CSS and native browser rendering, applied here to the pixels of your image rather than to a live page element.
A higher radius spreads each pixel's color further into its neighbours, softening detail and edges progressively. At low radii the effect is a gentle softening; at high radii, fine detail and small text become fully illegible, which is useful for privacy blurring.
The filter runs on an OffscreenCanvas inside a Web Worker, and the blurred canvas is re-encoded in your original image format. The blur applies uniformly across the whole image; there is currently no option to blur only a selected region.
Frequently Asked Questions
Can I blur just one part of the image, like a face?
Not yet. This tool blurs the entire image uniformly. For region-specific blurring, such as covering a logo or a face in one corner, crop to that area first or use it alongside the Watermark Remover tool's rectangle selection.
What blur radius should I use?
A radius of 5-15px gives a gentle softening effect. 20-40px is strong enough to obscure faces, license plates, or text for privacy purposes.
Does blurring reduce the file size?
Often yes, since a blurred image has less fine detail to encode, though this depends on your output format and the original content.
Can I blur multiple images at once?
Yes. Batch processing applies the same blur radius to every image you upload at once.
Are my images uploaded to a server?
No. Blurring happens entirely in your browser using the Canvas API. Your images never leave your device.