Free Photo Blur / Mosaic Tool: Hide Faces & Plates, No Install Needed

Worried about exposing personal information when sharing photos online? Our tool lets you instantly Gaussian-blur any part of your image with a simple mouse drag — no software needed. Everything processes 100% locally in your browser, so your image is never sent to a server.

Algorithm: Gaussian Blur (Canvas API)Privacy: 100% Client-side Local (No Upload)

Drag and drop an image here or click to select

JPG, PNG, WEBP, GIF

Moments When Privacy Protection Matters (Storytelling)

# Sharing on Social Media or Marketplaces

Perfect for hiding bystanders' faces before posting on Instagram or blogs. Easily redact license plates on vehicle listings, or address signs in real estate photos. One drag protects both portrait rights and personal data.

# Sharing Work Docs or Screenshots

When sharing work screenshots, quickly mask colleague names, email addresses, or private contacts. An essential tool for security audits and business reporting.

Gaussian Blur Algorithm Explained

Gaussian blur is a mathematical technique that computes a weighted average of neighboring pixels to create a smooth blur effect. Unlike simple pixelation (mosaic), it produces a natural, seamless appearance. Once processed, the original pixel data is irreversibly lost through mathematics — making it impossible to reverse-engineer.

// Gaussian Blur Formula

G(x, y) = (1 / 2πσ²) × e^(-(x²+y²) / 2σ²)

Pixel' = Σ G(x, y) × Pixel(x, y) [Irreversible]

How to Use (Step-by-step)

1
Click 'Select Image' or drag and drop your image into the workspace.
2
Adjust the brush size and blur strength to your desired level.
3
Drag your mouse over areas to blur (faces, license plates, etc.), then download the result.

Tool Specs & Support Info

Feature	Details	Performance	Notes
Supported Formats	JPG, PNG, WEBP, GIF & more	All browser-supported types	No file size limit
Processing Mode	100% Client-side Local	No server upload	Full privacy guaranteed
Blur Algorithm	Gaussian Blur (adjustable σ)	Irreversible	Original data cannot be recovered

Frequently Asked Questions (FAQ)

Q.Can I reverse the blur and get the original image back?

No. Gaussian blur is an irreversible process that mathematically mixes surrounding pixel colors. Once the blurred image is saved, it is impossible to recover the original data, making it highly effective for privacy protection.

Q.Is my photo saved or collected on your servers?

Absolutely not. This tool uses the browser's Canvas API to process images entirely on your local device. No data is transmitted to any server — your privacy is fully guaranteed.

Q.Can I blur images by touch on a smartphone?

Yes! Touch events are fully supported, so you can drag your finger to apply blur in any mobile browser. The same level of precision as on desktop is available.

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