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Image Gaussian Blur
Drag files here orclick to upload
2 files, max 5M each
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About This Tool
Image Gaussian Blur is a completely free online Gaussian blur tool with adjustable blur radius and sigma, all processed locally in your browser.
How to Use
- Add Image
Click "Add File" or drag and drop images; batch upload supported.
- Set Parameters
Adjust blur radius and sigma on the right to control the effect.
- Download
Click "Download Single" or "Download All" when satisfied.
Use Cases
- Blur background to highlight the main subject or add depth of field
- Blur sensitive info like faces or numbers for privacy protection
- Add a dreamy aesthetic and artistic atmosphere
Key Advantages
- Completely Free
No payment or registration needed; unlimited use of all features.
- Privacy Safe
All processing is done locally in your browser; files are never uploaded to any server.
- Flexible Parameters
Independently adjust blur radius and sigma for precise blur control.
- Batch Processing
Add multiple images, batch convert with unified parameters and download as ZIP.
- Fast Processing
Local processing without network transfer, no waiting in queue.
Parameter Details
Understanding the relationship between blur radius and sigma:
| Parameter | Description | Recommended |
|---|---|---|
| Blur Radius | Controls the range extent of blur | 5-20 for normal blur |
| Sigma | Controls decay speed from center to edge | Natural when close to radius |
| Combined | Radius determines size, sigma smoothness | Equal or sigma slightly smaller |
FAQ
Gaussian blur is a classic image blur algorithm that weights pixels by a normal distribution, producing a natural smooth blur effect widely used in image processing and photography.
Upload an image, adjust blur radius and sigma, preview and download. Batch processing supported.
Common browser-decodable formats (JPG / PNG / WebP, etc.) are supported; output is PNG.
Radius determines the extent of blur, sigma determines the Gaussian distribution spread (decay speed from center to edge).
The tool only generates a new blurred image; your original file is not modified or deleted.
Mainly image resolution and blur radius; larger values take longer.
Yes. Add multiple images, set unified parameters, batch convert and download as ZIP.
The original is not modified; downloaded blurred images cannot be reversed — keep your original.
Yes. The tool is responsive and works on mobile and tablet browsers.
Images are processed entirely in your browser and never uploaded to any server.
Ensure images are not corrupted, refresh and retry, or try a different browser or smaller radius.
Processing is local; only the initial page load needs a network connection.
Content last updated：2026-07-10
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