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Pixelate image online

Use this image pixelator to pixelate photo files with adjustable block size. Preview instantly, apply a pixel filter look, and download PNG in your browser.

What is a pixelate effect?

A pixelate effect makes an image look blocky by enlarging the apparent size of each pixel so neighboring colors merge into square mosaic tiles. This process is often called pixelization. This page downsamples your photo to a smaller grid, then scales it back up with nearest-neighbor sampling so edges stay sharp like a classic pixel filter. Block size sets how many source pixels each square represents: small blocks keep detail; large blocks create a heavy retro mosaic. Upload, adjust block size, preview beside the original, and download PNG in your browser.

Pixelate effect features

Pixelization and mosaic block sizing in the browser.

  1. Block size slider: 2–100 px squares—tune from subtle mosaic to heavy pixelation.
  2. Automatic preview: Output refreshes as you drag the block size control.
  3. Side-by-side panels: Compare original and pixelated images before download.
  4. Nearest-neighbor upscale: Crisp square edges without blur between blocks.
  5. PNG download: Save as pixelate-effect-image.png.
  6. Client-side only: No server upload or account.

How to pixelate a photo

Steps to pixelate image files online.

  1. Upload your image: Drop or click in the input panel (15 MB max).
  2. Set block size: Start around 12 px; raise for stronger retro mosaic.
  3. Review the preview: Check that faces or text are obscured enough if censoring.
  4. Download PNG: Save the pixelated image for posts, games, or privacy.

Tips for pixelated images

Better mosaic, pixel filter, and censor results.

  1. Start at 12 px: A moderate default works for many photos before pushing higher.
  2. Bigger blocks for privacy: Use 20–40 px or more so text and faces are unreadable.
  3. Not the same as blur: Use /blur-image when you want smooth obscuring instead of squares.
  4. Try posterize for color bands: /posterize-image limits palette levels without square blocks.
  5. Crop first for local censor: Isolate the region on /crop-image if only part needs pixelation.
  6. Export PNG: PNG keeps hard block edges cleaner than JPEG recompression.

When to use pixelate

Typical uses for mosaic effects.

  1. Privacy censoring: Obscure license plates, faces, or sensitive text in screenshots.
  2. Retro game art: Quick mosaic pass before refining in a pixel art editor.
  3. Social stickers: Chunky pixel look for memes and playful posts.
  4. Thumbnail previews: Hide spoiler imagery while keeping composition readable.
  5. Design mockups: Placeholder mosaic texture until final assets arrive.
  6. Teaching demos: Show how resolution and block size relate visually.

Why use this pixelate tool

Benefits of browser-based mosaic pixelation.

  1. One control: Block size is all you need for classic mosaic pixelate.
  2. Private: Images stay on your device.
  3. Instant feedback: Live preview while adjusting block size.
  4. Free: Unlimited previews and downloads.
  5. No install: Works in modern browsers with Canvas 2D.
  6. Crisp blocks: Smoothing disabled on upscale for sharp mosaic edges.

Technical details

How mosaic pixelation works here.

  1. Algorithm: Downscale to ceil(w/block) × ceil(h/block), upscale with imageSmoothingEnabled false.
  2. Block size: Integer pixels, minimum 2 in the UI slider.
  3. Dimensions: Output matches source width and height.
  4. Input limits: 15 MB; longest edge 8192 px.
  5. Rendering: Canvas 2D drawImage on temporary canvas.
  6. Browser support: Chromium, Firefox, Safari with Canvas 2D.

Frequently Asked Questions

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