ImageToolKit

Pixelate Image Online — Adjustable Pixel Block Size [2026]

Pixelate any image with adjustable block size. Create retro pixel art effects or censor parts of photos. Free browser-based tool — no upload, no signup needed.

Drop an image here or click to browse

Supports JPEG, PNG, WebP, GIF

What is Image Pixelator?

Image Pixelator is a free online tool that applies a pixelation (mosaic) effect to images. You can control the pixel block size from subtle to extreme. This is useful for creating retro pixel art effects, anonymizing faces or sensitive information in screenshots, or generating stylized mosaic images. All processing happens in your browser.

How to Use Image Pixelator

Upload an image by dragging it into the drop zone or clicking to browse. Use the block size slider to control the level of pixelation — small values give subtle pixelation, large values create a bold mosaic effect. The preview updates in real time. Click "Download" to save the pixelated image.

How Image Pixelator Works

The tool loads your image onto an HTML5 Canvas element. For each block of pixels (determined by the block size slider), it samples the color at the center of the block and fills the entire block with that single color. This creates the characteristic pixelated mosaic appearance. Larger block sizes result in more pronounced pixelation. Everything runs in your browser.

Common Use Cases

  • Censor or blur faces and sensitive information in screenshots
  • Create retro pixel art effects from photographs
  • Generate mosaic-style images for creative projects
  • Anonymize license plates and addresses in photos
  • Produce stylized low-resolution artwork from high-resolution images

Frequently Asked Questions

What is the block size slider?▼

The block size determines how many original pixels are grouped into one large pixel block. A block size of 1 means no change, while a block size of 20 means every 20x20 area becomes a single solid color.

Can I use this to censor sensitive information?▼

Yes. With a large enough block size, the pixelation effectively obscures faces, text, license plates, and other identifiable content. However, the entire image is pixelated — for selective pixelation, use a dedicated editing tool.

Does this tool upload my images to a server?▼

No. All processing happens entirely in your browser using the HTML5 Canvas API. Your images never leave your device.

What image formats are supported?▼

You can upload JPEG, PNG, WebP, GIF, and BMP images. The pixelated image is downloaded as a PNG file.

Can I undo the pixelation?▼

The downloaded pixelated image is permanently pixelated. However, the original file on your device is not modified. You can re-upload and adjust the block size at any time.

Related Tools

Image Grayscale Converter

Convert any image to grayscale instantly. Transform color photos into black and ...

Image Sepia Filter

Apply a sepia tone to any image for a warm vintage look. Adjustable intensity sl...

Image Resizer

Upload any image → get exact pixel dimensions in seconds. Resize by pixels or pe...