Image Pixelate / Mosaic

Pixelate an image at a chosen block size. Classic mosaic effect.

Tool Media & Files Updated Apr 19, 2026
How to Use
  1. Drop image.
  2. Set pixel block size.
  3. Download.
Image
Drop image
Preview

How it works

Downsample
To w/block × h/block
Upsample
Nearest-neighbor
Effect
Large squares
Redaction
Prefer blur
Pixelate can be partially reversed.
Output
PNG
Privacy
Local

About the Image Pixelate / Mosaic

Need a hand with image, audio and file tasks? The Image Pixelate / Mosaic does the work for you — free, and right here in your browser. Pixelate an image at a chosen block size. Classic mosaic effect.

How it works

Type in what you have, and the answer shows up right away. Change anything and it updates by itself. Everything runs in your browser, so it is fast and nothing you type is sent away.

Want the deeper story? The Knowledge Base explains the ideas behind the tools in more detail.

Frequently Asked Questions

Redaction?

Use a large block for privacy. Note: pixelation can sometimes be reversed — heavy blur is safer for identity.

How do I use the Image Pixelate / Mosaic?

Just type your numbers. The answer shows up right away — there is no button to press. Change anything and it updates by itself.

Is it free? Does it work without internet?

Yes to both. It is free with no sign-up, and once the page has loaded it keeps working even with no internet.

Where does my data go?

Nowhere — every calculation runs on your own device. Nothing you enter is uploaded, logged, or stored.

Common Use Cases

Censor

Hide faces.

Art

8-bit look.

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