Blur an Image Online
Soften a whole picture, lightly or completely.
Drop a file here
or click to choose a file
Runs on your device Your file is processed by your own browser and is never uploaded to a server.
Short answer
An image can be blurred in a browser by averaging each pixel with its neighbours. Three passes of a box blur are used, which converges on a Gaussian closely enough that the difference is invisible, and the sliding-window implementation means a wide blur costs no more than a narrow one. The whole image is processed, and nothing is uploaded.
At a glance
| Accepts | JPG, PNG, WebP, GIF, BMP |
|---|---|
| Produces | Same format as the original |
| Processing | In your browser |
| Price | Free, no limits |
| Account | Not required |
This blurs the entire picture rather than a region you select. That matters, because the most common reason people reach for blur is hiding one face or one address in an otherwise normal photo, and that needs a selection this tool does not have — and is better served by cropping the sensitive part away entirely.
What it is good for is the whole-frame version: a background for a card or a slide, a placeholder that suggests an image without showing it, a frosted backdrop behind text, or obscuring a screenshot completely before sharing it.
How to use it
- 1
Add the image
Drop in any common image file.
- 2
Pick a radius
A few pixels softens; forty makes the picture unreadable.
- 3
Download it
The dimensions are unchanged — only the detail is gone.
Frequently asked questions
Can I blur just one part of the image?
Not with this tool. To hide one area, crop it out instead — removing the pixels is more reliable than softening them.
Can a blur be undone?
Not meaningfully at these radii. Averaging discards the differences between neighbouring pixels, and with a large radius there is nothing left to work back from. For anything sensitive, crop rather than blur.
Why does the file get smaller?
Blurring removes high-frequency detail, which is the expensive part of any image to store. A heavily blurred photo can compress to a small fraction of its original size at the same dimensions.