What pixelation and blur do to your pixels
Pixelation divides the image into a grid and replaces each cell with a single color, usually the average of the pixels inside it. A 4000 by 3000 photo pixelated to 48 blocks across the long edge has 1,728 cells left instead of 12 million pixels.
Blur works the other way around. Every pixel becomes a weighted average of its neighbors, so the image keeps its full resolution but edges spread out and fine detail disappears. Each output pixel still carries a trace of the pixels around it, and that trace is what makes blur reversible in some cases (more on that below).
| Attribute | Pixelate | Blur |
|---|---|---|
| What it keeps | Coarse shapes and colors | Smooth gradients and overall layout |
| Look | Deliberate and blocky | Soft and photographic |
| Best for | Censoring, retro, game art | Backgrounds, depth, dreamy looks |
| Main risk | Small blocks can leak shapes | Light blur can be sharpened back up |
When pixelation is the better choice
Pixelation is honest about what it is. Nobody looks at a mosaic face and wonders whether the photo was just out of focus, which is why screenshots and news photos use it to mark something as hidden.
In Pixelate Image, the Blocks setting counts cells along the longest edge, so 48 blocks looks the same on an 800 px preview and on a 6000 px export. The Light, Medium and Heavy presets use 120, 48 and 16 blocks. Sampled mode picks one pixel per block instead of averaging, which gives a harsher, more graphic look.
- Retro and game-inspired looks
- Marking a face or a name as deliberately hidden
- Turning a photo into a low-resolution poster
When blur is the better choice
Blur suits anything that should still look like a photograph. A softened background pushes the eye toward the subject, and a light blur takes the edge off noisy textures.
We built the Blur tool so strength is relative to the picture. At 100, the radius is 6% of the longest edge, which is 240 px on a 4000 px photo. That is why a setting that looks right in the preview also looks right in the download. Set Focus to Center to keep a sharp oval in the middle while the edges fall off.
Why light blur and small pixel blocks fail on sensitive text
Blur is a known operation, and known operations can be run backward, at least partly. Deconvolution can sharpen a lightly blurred photo, and tools such as Depix have recovered text from screenshots pixelated with small blocks by matching each block against renderings of a known font.
Both attacks get harder as you remove more information. A block that covers several characters at once leaves nothing to match, and a blur wide enough to merge neighboring letters leaves nothing to sharpen. The practical test is simple: export the file, zoom to 200%, and try to read it yourself. If you can guess a word, software can too.
The only guaranteed option is removal
Pixelation and blur hide detail from someone glancing at the image. Cropping the area out, or covering it with a solid box before you export, hides it from someone who is trying.
Recommended settings in PixDazzle
These are starting points. Zoom in on the preview and adjust for your photo.
- Pixelate a face for style: Medium (48 blocks). For anything you want gone, Heavy (16 blocks).
- Soften a busy background: Blur Soft (15), then Center focus to keep the subject sharp.
- Bury detail in a whole image: Blur Strong (60).
- Trim out anything the effect can't hide safely with Crop Image.
