Blur Image

About this tool

The Image Blur Region tool gives you a precise way to blur only the part of an image you choose. Draw a rectangle with your mouse or finger, set the blur strength from 2 to 40 pixels, and click Apply — the rest of the image stays sharp. Unlike heavy pixelation, a Gaussian-style blur preserves the general shapes and color tones of the blurred region while making fine detail unrecoverable. You can apply blur to multiple regions in sequence before downloading. Everything happens in your browser; sensitive images such as identity documents, screenshots of private chats, or photos containing license plates never touch a server.

Why use it

• Selective blur — only the region you choose is affected, the rest stays pixel-sharp.

• Multi-region support means you can blur a face, a plate, and a screen all in one image.

• Adjustable strength from subtle defocus to full unrecoverable blur.

• Touch-friendly rectangle drawing for phones and tablets.

• True Gaussian-style blur via the browser's native filter — fast and smooth.

• 100% browser-based — sensitive content never leaves your device.

How to use

1. Upload your image with the file picker or drag-and-drop.
2. Drag a rectangle on the image to mark the area you want to blur.
3. Adjust the Blur strength slider — 2px is subtle, 40px makes fine detail unrecoverable.
4. Click Apply Blur to commit the effect to the selected rectangle.
5. Repeat for additional regions; click Reset to start over.
6. Click Download PNG to save the result with all blurred regions baked in.

When it helps

• When publishing a photo with bystanders whose faces should not be identifiable.
• When sharing a screenshot that contains an account number or email address.
• When posting a vehicle photo and you want to obscure the license plate.
• When redacting confidential information in a UI screenshot.
• When creating a defocused background effect for product photography.
• When obscuring brand logos in a photo for editorial or fair-use purposes.

Examples

Tips

• For privacy redaction, use blur strength 20+ — lower values can sometimes be partially reversed with deconvolution.
• If the rectangle is too small, the blur may not be strong enough; expand the selection slightly past the sensitive area.
• Apply blur twice to the same region for extra coverage on small text like email addresses.
• Combine with the Pixelate tool when you need maximum redaction certainty.
• Use Reset before changing strategy — this clears all prior blurs in one click.

Frequently Asked Questions

Glossary

Gaussian blur

An image-blurring method that averages each pixel with its neighbors using a Gaussian kernel — produces smooth, natural-looking defocus.

Blur radius

How far each pixel is averaged with its neighbors — larger radius means more blur and less recoverable detail.

Region of interest (ROI)

The user-selected rectangle that limits processing to just that area of the image.

Redaction

Obscuring sensitive parts of an image or document so the underlying information cannot be read.

Canvas filter

A CSS-style filter (like blur, sepia, brightness) applied to a canvas drawing context for image processing.

Compositing

Combining multiple layers of image data — here, drawing the blurred region back onto the original canvas.