🌫️ Free Online Image Blur Tool
Apply beautiful Gaussian blur to backgrounds or selectively censor sensitive faces, license plates, and confidential text.
Upload Image to Blur
Apply full image Gaussian blur or selectively censor sensitive text, faces & IDs
The Complete Guide to Photo Blurring, Aesthetic Depth of Field & Privacy Redaction
From hiding confidential banking details on shared screenshots to creating artistic out-of-focus background bokeh for website hero banners, image blurring is one of the most essential digital manipulation techniques in modern media production.
How Gaussian Blur Works
Gaussian blur is a 2D mathematical convolution algorithm named after mathematician Carl Friedrich Gauss. It recalculates the color of each pixel by taking a weighted Gaussian bell-curve average of its neighboring pixels. The result is a smooth, organic diffusion of light and edge contrast that eliminates fine details while preserving overall color temperature and composition.
Common Use Cases for Image Blurring
🛡️ Privacy & Identity Redaction
Censor bystander faces in public photography, conceal vehicle license plates, hide home addresses, and redact credit card numbers on payment receipts.
🎨 Aesthetic UI Backdrops
Heavy Gaussian blurs (20px to 40px) transform busy stock photos into elegant, colorful abstract background textures for website cards and banners.
📱 Screenshot Censoring
Easily redact sensitive API keys, email addresses, and private messaging chats before sharing instructional screenshots on technical blogs.
Step-by-Step: How to Censor Photos with Selective Blur
- Upload Your Photo: Drag and drop your image into the workspace.
- Select "Selective Censor Box" Mode: Switch to selective box mode in the left toolbar.
- Draw Redaction Boxes: Click and drag your cursor over any sensitive face, text, or object. You can draw multiple boxes across the photo.
- Adjust Blur Radius: Fine-tune the blur strength slider to ensure complete illegibility.
- Download Censored Image: Save your permanently redacted PNG image.
