Image Blur Tool
Apply adjustable Gaussian blur to any image in your browser.
Drop your image here
or click to browse · max 50 MB
Settings
wasm-vips (~5MB) will be downloaded on first use and cached by your browser.
Image Blur Tool
Applies Gaussian blur to images with adjustable intensity. Gaussian blur smooths images by averaging pixel values with a bell-curve (Gaussian) weighted kernel. Higher sigma values produce more blur. Uses wasm-vips for high-quality processing entirely in your browser.
What is it used for?
- Blurring sensitive information (faces, license plates, addresses) in screenshots
- Creating soft background effects for product photography
- Reducing noise and grain in photographs
- Creating frosted glass effects for UI design
- Generating blurred placeholder images for lazy loading
Step-by-Step Guide
- Click the upload area or drag and drop your image
- Adjust the blur amount using the slider (1-20)
- Choose your output format (PNG, JPEG, WebP, or AVIF)
- Click Convert to apply the blur
- Preview and download the blurred image
How it works
Upload an image and adjust the blur sigma (intensity). Click Convert to apply the Gaussian blur using wasm-vips. The result can be previewed and downloaded in your chosen format.
Tips & Best Practices
- Sigma 1-3: subtle softening, good for portrait skin smoothing
- Sigma 5-8: noticeable blur, good for obscuring text or details
- Sigma 10+: heavy blur, creates abstract background effects
- Use WebP output format for the best file size with blurred images
Frequently Asked Questions
What does the blur sigma value mean?
Sigma controls the radius and intensity of the Gaussian blur. Lower values (1-3) produce subtle blur, medium values (5-8) create noticeable blur, and high values (10-20) produce heavy blur.
Can I blur only part of the image?
This tool applies blur to the entire image. To blur a specific area, crop the region first, blur it, then composite it back using an image editor.
Will blurring reduce file size?
Yes, blurred images compress better because they have less detail. JPEG and WebP outputs of blurred images are typically smaller than the original.
Privacy & Security
This tool uses wasm-vips (libvips compiled to WebAssembly). The WASM binary (~5MB) is downloaded on first use and cached by your browser. All image processing happens locally on your device - your images are never uploaded to any server. This makes it safe for sensitive, private, or confidential images.