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JPG, PNG, WebP supported · Max recommended 25MB
Apply a mosaic pixelate effect to hide sensitive details.
Click or drag image here
JPG, PNG, WebP supported · Max recommended 25MB
Apply a pixelate or mosaic effect to any photo online for free with ResizerPhoto. Pixelation is used to hide sensitive details, obscure faces for privacy, or create an artistic retro 8-bit look. Our tool lets you control the block size for the effect.
Pixelation breaks an image down into visible blocks of solid color, and it's most commonly used as a fast, unmistakable way to obscure sensitive details in a photo — a face that needs to remain anonymous, a license plate, a screen showing private information, or any other element that needs to be clearly unreadable rather than just softened. Unlike a blur, which can sometimes still allow some detail to be guessed at higher strengths, a strong pixelation effect makes the underlying content genuinely impossible to reconstruct, which is why it's the standard technique used in news broadcasts and documentaries whenever a face or detail needs to be hidden.
Choosing the right pixelation strength depends on how completely you need to obscure the content: a smaller block size retains a rough sense of shape and color while still hiding fine detail, which works well for artistic mosaic-style effects, while a much larger block size is appropriate when the goal is complete anonymization, such as hiding a face or readable text with no possibility of the original being guessed or reconstructed.
The tool divides the image into a grid of square blocks, with the block size determined by the pixelation strength you choose — a larger block size means each square covers more of the original image and therefore hides more detail. For every block, the tool samples the color of a single pixel at that block's position and then fills the entire block with that flat, solid color, effectively discarding all of the fine detail that existed within that square in the original photo. Because every pixel within a block becomes identical, there's no way to recover the original detail from the pixelated result, which is exactly what makes this technique reliable for genuinely obscuring content rather than just visually softening it. This block-by-block process runs across the entire image directly in the browser using the canvas API's pixel-reading functions, and increasing the block size produces a more heavily obscured, and faster to compute, result, since fewer, larger blocks require less individual color sampling than many small ones.
Beyond privacy use cases, a lighter pixelation effect is also popular as a deliberate retro or 8-bit style aesthetic, reminiscent of early digital graphics and video games, and is often applied to entire images rather than just a specific region for this creative purpose. Because the block size directly controls the trade-off between how recognizable the original content remains and how completely it's obscured, it's worth testing a few different strengths on the same photo before deciding — a setting that looks appropriately artistic for one photo might not be strong enough to properly hide sensitive details in another, depending on how large or small the element you need to obscure is relative to the overall image size.
Larger block sizes create a stronger mosaic effect. Use 10-20px for subtle pixelation and 30px+ for a strong artistic effect.
Our tool applies pixelation to the whole image. For selective pixelation, use a desktop editor.
No. Once pixelated and downloaded, the original detail cannot be recovered from that file.
Blur creates a smooth out-of-focus effect. Pixelate creates a blocky mosaic pattern by averaging pixels in each block.
Yes. Pixelation is commonly used to hide faces, license plates and other sensitive details. Use a large block size for stronger privacy protection.
Yes. Use one tool, download the result, then upload that file into another tool on this site to layer edits.
No, this changes how the pixels look, not how many pixels the image has.
Yes, any standard JPG, PNG, or WebP photo from a phone or camera works with this tool.