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Blur Image Online Free

Select areas to blur and hide sensitive information. No sign up required.

Drop image here or click to upload

Your file stays in your browser — nothing is uploaded

How to Blur Sensitive Information in Images

1

Upload image

Select or drag the image with sensitive data.

2

Draw over areas to blur

Click and drag rectangles over the areas you want to hide.

3

Download

Save your image with blurred regions.

Blur Sensitive Information in Images — Free Image Blur Tool

Need to hide private information in a screenshot or photo? Our free online blur tool lets you select specific areas of an image and apply a box blur effect to obscure sensitive content. Whether you need to redact personal details, hide credit card numbers, blur faces, or conceal confidential text, this tool makes it quick and easy.

Simply upload your image, then click and drag on the preview to draw rectangles over the areas you want to blur. You can adjust the blur strength to control how much the content is obscured. Use the undo button to remove the last blur region, or clear all to start over. Each blurred region is tracked separately for maximum flexibility.

All processing happens locally in your browser using the Canvas API — no file uploads, no server processing. Your images never leave your device, making this the safest way to redact sensitive information from photos and screenshots. Works on Chrome, Firefox, Safari, and Edge with no software installation required.

FAQ

Blur Image | PDFOnlineToolbox

Blur Image | PDFOnlineToolbox

How do I blur part of an image?

Upload your image, then click and drag on the preview to draw rectangles over the areas you want to blur. Adjust the blur strength as needed, then download the result.

Can I blur multiple areas?

Yes. You can draw as many blur rectangles as you need. Each rectangle is tracked separately, and you can undo the last one if needed.

What is the blur strength control?

The blur strength slider controls how many pixels are averaged together when applying the box blur. Higher values create a stronger blur effect, making it harder to see the underlying content.

Is my image uploaded to a server?

No. All blur processing happens directly in your browser using the Canvas API. Your image never leaves your device, ensuring complete privacy.

Gaussian Convolution Filtering for Anonymization

Our blurring tool applies Gaussian convolution filters to selective canvas bounding boxes or entire image buffers. Obscure facial features, license plates, or confidential text in local memory to ensure privacy compliance before sharing.

Key Use Cases

  • Anonymizing faces and personal identities in photos published to public websites
  • Blurring sensitive financial data, account numbers, and addresses on screenshots
  • Creating soft background textures from high-contrast photos for UI design

Privacy & Security Guarantee

Because this utility executes entirely within your web browser's local sandbox, your sensitive files are never uploaded to cloud servers, stored in temporary directories, or inspected by third-party logs. This ensures complete data confidentiality and compliance with privacy standards.

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