Home/Tools/Photo Mosaic & Blur
Zero-Upload Privacy Mosaic

Free Photo Mosaic & Face Blur Tool - Hide Sensitive Info | Prezll

Protect personal info on photos with 100% private in-browser blur & mosaic

⚡Общо редактирани изображения
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
,
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
0
1
2
3
4
5
6
7
8
9
How It Works

Complete in 3 Simple Steps

1

Select Photo

Upload the photo containing private information. No data leaves your machine.

2

Drag to Obscure

Select Mosaic or Blur and drag across the area you want to conceal.

3

Export Safely

Copy to clipboard or download. The underlying pixels are permanently obliterated.

Why Use Client-Side Mosaic for Privacy?

Most web photo tools require uploading your pictures to remote servers. When you need to blur sensitive content—receipts, credit card numbers, license plates, or faces—uploading creates privacy risks. Prezll processes everything locally in browser memory so your sensitive data never leaves your device.

FAQ

Frequently Asked Questions

Q.What is the difference between Mosaic and Blur?

Mosaic uses pixelated blocks that completely scramble text and numbers. Blur creates a smooth, unfocused effect ideal for faces and aesthetics.

Q.Can someone un-blur the exported photo?

No. Once exported, original pixel values are mathematically replaced and cannot be recovered.

Q.Can I invert the selection to blur the background?

Yes. Use the Invert Selection toggle to keep the subject sharp while blurring the background.

Explore Other Tools

View All →
Instagram Feed 4:5 Optimized
Instagram 4:5 Crop

Maximize your Instagram feed screen space with 4:5 portrait crop in seconds

Zero Quality Loss EXIF Strip
EXIF Metadata Remover

Strip hidden home address & GPS coordinates before posting online

Discord & Social Media GIF Optimizer
GIF Compressor

Fit large GIFs under Discord's 10MB limit without sacrificing motion quality