Image Blur Tool

Blur an image online, free and private

To blur an image online, drop it on the upload area, pick Gaussian, Box or Motion blur, set the Blur Radius between 1 and 50 px and click Download Blurred Image. To hide only a face, a number plate or a line of text, set Blur Mode to Selective Areas and drag a rectangle over each one; everything outside the rectangles stays sharp.

Blurring replaces every pixel with an average of the pixels around it, so detail fades as the radius grows. This free image blur tool does that work in your browser: the photo is blurred on a canvas by JavaScript running on your own device, nothing is uploaded, and you can confirm it in the Network tab of your browser's DevTools.

The download keeps your format. JPG stays JPG, WebP stays WebP, and PNG, GIF and BMP become PNG with transparency intact. The file name gets a "_blurred" suffix, so your original is never overwritten. Crop away what you do not need first with the image cropper, then shrink the result with the image compressor or stamp it using the add watermark tool.

Table of Use: what to blur and where to start

The radii below are starting points, not guarantees. How much blur is enough depends on how many pixels tall the thing you are hiding is, so zoom in on the result before you share it.

After blurring a background, add a caption with Add Text to Image, or darken the edges of the frame with the vignette effect tool.

Features

• Three blur types. Gaussian runs three box passes whose combined spread matches a Gaussian with standard deviation sigma = radius / 1.732 (the square root of 3). Box averages the 2 x radius + 1 pixels around each pixel in a row, then in a column. Motion averages pixels along a straight line at the angle you choose, 0 to 179 degrees.
• Blur Radius from 1 to 50 px. The slider starts at 10 and the preview re-renders a moment after you stop dragging.
• Full Image or Selective Areas. Draw as many rectangles as you need on the preview, or type X (from left), Y (from top), Width and Height in image pixels. Numbers that fall outside the picture are adjusted to fit, and each area has its own Remove button.
• Before/After Comparison. Drag across the preview (in Selective Areas mode, use the slider under it) to move the line between the original and the blurred version.
• Undo and Redo. Each image keeps up to 30 saved versions, covering changes to the settings and the areas.
• Several images at once. Select multiple files and each gets its own settings and its own Download Blurred Image button. There is no ZIP download.
• Transparency stays clean. Blurring uses premultiplied colour values, so transparent edges do not pick up dark halos.
• No face or plate detection. You mark every area yourself, so you see exactly what is covered instead of trusting a detector that may miss a face.

To make a photo crisper instead, use the image sharpener; to remove grain rather than add softness, try the image noise reducer.

How to blur an image online, step by step

1. Drop one or more images on "Drop images here or click to upload", or click Select Images. Any image format your browser can open works.
2. Under Blur Type choose Gaussian (natural), Box (fast) or Motion (directional). Motion adds a Motion Angle slider from 0 to 179 degrees.
3. Drag the Blur Radius slider from Light Blur to Heavy Blur.
4. Choose Blur Mode. Leave it on Full Image to blur everything, or pick Selective Areas and drag rectangles over the faces, plates or text to hide. Green numbered boxes mark each area.
5. Check the result with the Before/After Comparison line. Use Undo, Redo or Clear All Areas if you want to change course.
6. Click Download Blurred Image. If the picture is too big for a web page or an email, run it through the image resizer as a last step.

Who can use it

• Sellers and landlords who need to hide a number plate or street sign before posting photos, then make a thumbnail for the listing.
• Support and documentation teams who share screenshots containing names, emails or account numbers.
• Parents, teachers and community admins who want to share a group photo without showing every face.
• Bloggers and designers who want a soft background for a headline or a collage panel.

FAQs