Blurring is one of the most common image editing operations: blurring sensitive information in a screenshot before sharing (email addresses, phone numbers, credit card numbers), applying background blur to focus on a subject, or adding an artistic blur effect to a photograph. The Utility Spark Blur Image tool applies Gaussian blur to the entire image or a selected region using the browser's Canvas API and CSS filter processing. Adjust the blur radius to control intensity — from subtle (radius 3–5) to heavy mosaic-style blur (radius 20+). The tool is particularly useful for privacy-protecting screenshots before sharing in documentation, bug reports, or social media posts.
lightbulb When to use this tool
- check_circle Blurring personally identifiable information (email, phone, address, face) in a screenshot before sharing.
- check_circle Blurring the background of a product image to create a depth-of-field effect.
- check_circle Applying a light blur to smooth noise or imperfections in a low-quality image.
- check_circle Creating a blurred background image for a website hero section from a high-contrast photograph.
Why use our tool?
Full Image and Region Blur
Apply blur to the entire image or draw a selection rectangle over a specific region to blur only that area (ideal for redacting sensitive information).
Adjustable Blur Radius
Control blur intensity from light (radius 2–5) to heavy (radius 15–30). A radius of 5 produces a subtle soft-focus effect; a radius of 25 produces a strong mosaic-like redaction.
Canvas API Processing — Privacy by Design
Blur processing uses CSS filter: blur() applied to a Canvas element. Your images — which often contain sensitive information you are trying to redact — are processed entirely locally.
How it works
Upload your image.
Select blur mode: full image or region selection.
For region blur: drag to draw the area to blur.
Adjust the blur radius slider.
Click 'Apply Blur' and download the result.
Examples
science Redacting Sensitive Info in Screenshot
Input: Screenshot containing email address and phone number
Mode: Region blur — draw boxes over each sensitive field
Blur radius: 20 (strong redaction)
Result: Screenshot safe to share in bug report or documentation with PII redacted