Image Mosaic & Blur Tool

Apply mosaic or blur to faces and sensitive info in images.
Fully browser-based — no server upload.

🔒

No Server Upload

Images never leave your device

✏️

Rect, Circle & Brush

Choose the tool that fits your needs

💾

PNG / JPEG / WebP

Save in your preferred format

Fully Browser-Based — Your images are never sent to any server

🖼️

Drag & drop an image
or click to select

JPEG, PNG, GIF, WebP supported (max 30MB)

* Images are never uploaded to a server

about,

About

The Image Mosaic & Blur Tool lets you apply mosaic pixelation, Gaussian blur, fill masks, or freehand brush effects to any part of your photos and images — completely in your browser.

Unlike most online tools, no images are ever uploaded to a server. All processing uses the HTML5 Canvas API and happens entirely on your own device, ensuring complete privacy.

Choose from 4 processing modes (Mosaic, Blur, Fill, Brush), 2 selection shapes (Rectangle, Circle), adjustable strength, and export as PNG, JPEG, or WebP. Full Undo/Redo support included.

how to,

How to Use

STEP 1

Load an Image

Drag & drop your image or click to browse. Supports JPEG, PNG, GIF, and WebP up to 30MB.

STEP 2

Mask the Area

In the Edit tab, choose a mode and drag over the area to mask. Use Brush mode to paint freehand. Press Ctrl+Z to undo at any time.

STEP 3

Download

Go to the Save tab and click Download. You can choose PNG, JPEG, or WebP format in Settings.

glossary,

Glossary

Mosaic (Pixelation): A privacy masking technique that divides an image region into blocks and fills each block with its average color, making the original content unrecognizable. Larger blocks produce a coarser effect. Commonly seen on interview subjects on TV broadcasts.
Gaussian Blur: An image processing filter based on the Gaussian function. It blends each pixel with its neighbors using a weighted average, producing a smooth and natural softening effect — widely used in photo editing and privacy masking.
Canvas API: A standard HTML5 API for rendering 2D graphics and manipulating pixel data in the browser. JavaScript can access raw pixel data (RGBA arrays) directly, enabling server-free mosaic and blur operations.
EXIF Data: Metadata embedded in digital photos, including capture date/time, camera model, and GPS coordinates. When images are exported via the Canvas API, EXIF data is automatically stripped, so location information cannot leak.
PNG / JPEG / WebP: PNG is lossless and supports transparency. JPEG uses lossy compression for smaller file sizes. WebP achieves high quality at 25–35% smaller file sizes than JPEG. This tool supports all three output formats.

faq,

FAQ

Q.Are my images ever uploaded to a server?: No, never. All processing uses the browser's Canvas API. This tool works even with your internet connection disconnected.
Q.What is the difference between mosaic and blur?: Mosaic pixelates the region into coarse grid blocks, while blur applies a smooth Gaussian filter. Neither method is reversible — both permanently mask the original content.
Q.How do I use Brush mode?: In the Edit tab, select "Brush" as the shape, then drag your mouse or finger over the image to paint the effect freehand. Adjust the Brush Size slider to change the area covered with each stroke.
Q.Does it work on smartphones?: Yes. Compatible with iPhone and Android browsers (Safari, Chrome, etc.). Touch-drag to select and mask regions on a touchscreen.
Q.Can I undo a mistake?: Yes. Click the "Undo" button or press Ctrl+Z (Mac: Cmd+Z) to reverse your last action. Up to 20 steps of history are kept.
Q.Is EXIF data (including GPS location) removed?: Yes, automatically. Because the image is re-exported via the Canvas API, all EXIF metadata including GPS coordinates and capture timestamps is stripped from the output file.