Blur Image Online — Free Gaussian Blur
Apply Gaussian blur to any image. Adjust blur intensity. Great for privacy, backgrounds, and effects.
Drop images here — batch supported
All image formats supported
How to Blur an Image Online for Free
Blurring an image used to require Photoshop or another desktop application. ImageZen4u applies a Gaussian blur to any image directly in your browser — no software to install, no file uploads, instant results on desktop or mobile.
Upload your image
Drop any JPG, PNG, or WebP image. Batch blurring supported — process multiple images at once.
Set blur intensity
Drag the slider from 2px (subtle softening) to 50px (heavy privacy blur). The right amount depends on your purpose.
Download your blurred image
Click Apply Blur and your image downloads immediately as JPEG. Multiple images download as a ZIP.
How much blur do you need?
2-5px — subtle: Softens fine detail without obviously blurring the image. Useful for skin retouching, reducing sensor noise, or gentle background softening.
6-15px — moderate: Clearly visible blur effect. Large shapes and colours remain identifiable. Good for artistic background blur effects and presentation backgrounds.
16-30px — strong: Most detail is obscured. Effective for hiding personal information like addresses and phone numbers while keeping the image usable.
31-50px — maximum: Near-complete obscuration. Use this intensity to make faces, licence plates, and sensitive text completely unreadable.
Common reasons to blur an image online
Privacy protection before sharing: Before posting a photo publicly, blur faces of people who haven't consented, licence plates of vehicles, house numbers, and any personally identifiable information visible in the background. This is the most common reason people search for "blur image online free".
Background blur effect: Creating a shallow depth-of-field effect (bokeh) that keeps the subject sharp while softening the background. This is a standard technique in portrait photography.
Presentation and web design: A blurred version of a photo makes an excellent background for overlaid text — the blur reduces visual competition with the text without removing the photographic context entirely.
Glassmorphism UI design: The popular frosted glass interface style uses blurred backgrounds behind semi-transparent panels. Creating these effects starts with a blurred source image.
Blur image for privacy — what intensity to use
For licence plates: 20-30px completely obscures the alphanumeric characters. Faces: 25-40px depending on the resolution of the image and the size of the face within it. Text: 20-25px makes standard text unreadable in most cases. Always zoom in to verify the information is actually obscured before publishing.