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Blur Image

Apply Gaussian blur or pixelate effects to your images. Use selective blur mode to quickly hide faces or sensitive data.

Blur Image

Apply Gaussian blur or pixelate effects to your images. Use selective blur mode to quickly hide faces or sensitive data.

upload_file

Click or Drag & Drop

JPG, PNG, WebP (Max 50MB per file)

blur_circular

Upload an image to start blurring.

edit_note By Meet Dhameliya
update Updated: Jul 28, 2026
schedule 3 min read

Image blurring serves two distinct purposes. The first is privacy: you need to share a screenshot but it contains email addresses, phone numbers, license plates, or faces that shouldn't be visible. The second is design: blurred images make excellent backgrounds for text overlays, hero sections, and presentation slides where you want visual texture without distraction. Most people reach for Photoshop or online tools that upload your image to a server — which completely defeats the privacy purpose. The Utility Spark Blur Image tool applies Gaussian blur directly in your browser using the Canvas API. Your image stays on your device from start to finish. You can verify this by disconnecting from the internet and watching the tool work perfectly offline.

lightbulb When to use this tool

  • check_circle Blur sensitive information in screenshots before sharing (emails, addresses, phone numbers, financial data)
  • check_circle Create blurred background images for website hero sections or presentation slides
  • check_circle Anonymize faces or license plates in photos before publishing
  • check_circle Add a soft-focus effect to product photography backgrounds
  • check_circle Prepare images for social media where certain details should not be visible
  • check_circle Create a frosted-glass effect for UI design mockups

Why use our tool?

Complete Privacy — Truly Offline Processing

The blur operation uses the Canvas API's built-in filter capabilities. Your image is loaded into a <canvas> element, the blur filter is applied via CSS filters or pixel manipulation, and the result is exported — all within your browser's memory. No server, no upload, no risk.

Adjustable Blur Intensity

Control exactly how much blur to apply using the intensity slider. Low blur for subtle background softening, high blur for complete obscuring of sensitive text or faces. Preview the effect in real-time before downloading.

Full Image or Selective Area

Apply blur to the entire image for background effects, or you can strategically blur specific areas. This flexibility makes it useful for both privacy redaction and design purposes.

No Quality Loss to Non-Blurred Areas

Unlike re-compressing an image through a server-side tool, the non-blurred portions of your image retain their original quality. Only the blurred region is modified.

Instant Download

The blurred image is ready to download immediately. No waiting for server processing, no queue, no premium speed options — the Canvas API processes most images in under a second.

How it works

1

Upload your image.

2

Select blur mode: full image or region selection.

3

For region blur: drag to draw the area to blur.

4

Adjust the blur radius slider.

5

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

Frequently Asked Questions

Can blurred text be un-blurred or recovered? expand_more
If sufficient blur is applied, the original text cannot be recovered. Gaussian blur is a destructive operation that permanently removes detail. However, very light blur can sometimes be partially reversed using sharpening algorithms. For sensitive data, use a blur intensity high enough that individual characters are not distinguishable.
What blur radius should I use for hiding sensitive text? expand_more
For text redaction, a blur radius of 15-25 pixels is typically sufficient to make text completely unreadable. For small text (10-12px font), a radius of 10-15 may suffice. Always verify by zooming in on the blurred area before sharing — if you can guess any characters, increase the blur.
Is Gaussian blur the same as pixelation? expand_more
No. Gaussian blur smoothly blends pixels, creating a soft, out-of-focus effect. Pixelation replaces groups of pixels with a single color, creating a blocky, mosaic appearance. Both hide detail, but Gaussian blur looks more natural and is preferred for design purposes.
Will this work on very large images? expand_more
Yes, though processing time increases with image resolution. A 4000x3000 photo typically blurs in 1-2 seconds. Very large images (8000x6000 or higher) may take 3-5 seconds depending on your device's processing power.
Can I blur a specific part of the image only? expand_more
The tool supports full-image blur with adjustable intensity. For selective area blurring (like blurring just a face in a photo), you can use the tool in combination with our Crop tool — crop the sensitive area, blur it, and then composite it back.

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