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Pixelate Image

Pixelate a whole image or a precise rectangular area without uploading the file.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Choose a JPG, PNG, or WebP image from your device.
  2. 2.Select the whole image or enter a pixel rectangle, then adjust the block size.
  3. 3.Select Pixelate image, inspect the natural-size result, and download the PNG.

About Pixelate Image

Pixelate Image creates a deliberate blocky effect across an entire picture or one rectangular part of it. Choose a JPG, PNG, or WebP file, select the whole-image option or enter a rectangle in pixels, adjust the block-size slider, and create a downloadable PNG. A small block size keeps more recognizable detail, while a larger block size produces fewer, more obvious color blocks. The result is useful for stylized avatars, retro game mockups, low-resolution artwork studies, presentation graphics, visual placeholders, and casual obscuring of an unimportant background detail. The source image stays on your device. It is decoded, transformed, previewed, and exported by the current browser without being posted to an upload service.

The rectangle controls use the source image's natural pixel coordinates. X measures from the left edge and Y measures from the top edge. Width and height describe how much of the image to affect. A rectangle that reaches beyond the right or bottom edge is safely clipped to the available pixels instead of changing the output dimensions. A rectangle entirely outside the image is rejected instead of being silently attached to an edge pixel. The rest of the image is first drawn unchanged, then only the selected rectangle is replaced by pixel blocks. Choose Whole image when you want one consistent effect everywhere and Rectangle when a logo, face, license plate, screen name, or other localized feature is the only target. The visible result summary reports the final clipped rectangle so you can confirm what was actually processed.

Pixelation divides the target rectangle into a fixed grid measured in the source image's natural pixels. The browser processes the full-block area and, when needed, separate right-edge, bottom-edge, and corner remainder tiles, using no more than four temporary sample surfaces. Each tile is sampled to its block-cell count and enlarged back over that exact tile with image smoothing disabled. Full blocks therefore follow the selected natural-pixel size. When a region is not evenly divisible, a narrow remainder block covers the final column or row rather than stretching every block or dropping edge pixels. For example, a 17 by 9 pixel region with an 8 pixel setting contains two full 8 pixel columns plus a 1 pixel edge column, and one full 8 pixel row plus a 1 pixel edge row. The original image is drawn into a separate output canvas at its natural width and height. The preview may be visually reduced to fit the page, but the Download PNG link always refers to that natural-size output canvas. A large source is therefore not quietly exported at the smaller preview size.

Files are limited to common browser-decodable JPG, PNG, and WebP images no larger than 25 MB. The tool also applies a 40-megapixel safety ceiling to avoid allocating an unexpectedly large group of canvases that could freeze a phone or a modest laptop. Animated WebP input is not preserved as an animation because browser canvas exports one still image. The finished file is PNG, which preserves the generated pixels without adding another lossy JPEG compression pass, although it may be larger than the original. Metadata such as camera details, GPS information, color profiles, and animation timing is not copied into the canvas export. Keep the source file when any of that information matters.

Pixelation is a visual effect, not secure redaction. Enlarged blocks still contain averaged or sampled visual information, and familiar shapes, text length, context, repeated frames, machine analysis, or a second copy of the image may allow someone to infer what was underneath. Never rely on this effect to remove passwords, account numbers, private messages, identity documents, medical details, financial data, faces requiring legal protection, or any other sensitive information. For a genuinely confidential image, remove the sensitive pixels entirely with a trusted redaction workflow, flatten the result, and inspect the exported file before sharing. A solid opaque replacement is generally safer than a reversible-looking visual treatment.

For reliable results, start by checking the source dimensions shown beside the filename. Use Whole image for a retro style or set Rectangle values that tightly surround the intended area. Move the block slider, create the output, and read the reported pixel rectangle. Open the downloaded PNG at full size, not only the fitted browser preview, and inspect both the affected region and its edges. If the blocks are too fine, increase the size; if the subject becomes unreadable for a harmless creative use, reduce it. Repeat with the original file rather than repeatedly processing an already pixelated download. The tool keeps this workflow direct and private while making the output geometry explicit.

Methodology & sources

The browser draws the original bitmap at natural dimensions and divides the selected, bounds-clamped rectangle into a fixed natural-pixel block grid. It handles the full-block area plus optional right-edge, bottom-edge, and corner remainder tiles with at most four temporary sample surfaces, so a partial final row or column keeps its true smaller size instead of stretching every block. Each tile is downsampled to its block-cell count, then enlarged over the exact same tile with image smoothing disabled. The natural-size output is encoded as PNG.

Frequently asked questions

Does Pixelate Image upload my picture?
No. Image decoding, canvas processing, preview creation, and PNG export all happen in your current browser.
Does the download keep the original dimensions?
Yes. The output canvas uses the image's natural pixel width and height. Only the on-page preview is fitted to the available space.
Can pixelation securely hide private information?
No. Pixelation is a visual effect and details may be inferred or partially recovered. Use a trusted redaction workflow for sensitive information.

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