HIFreeTools
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Pixelate Image

Add a pixelated mosaic effect to a photo to censor faces, plates, or private details, with an adjustable block size — all in your browser, no upload.

FreeNo sign-upPrivate — runs in your browser, nothing is uploaded

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Pixelate (mosaic / censor) a whole image to obscure faces or private details. Larger blocks hide more. Runs entirely in your browser — your image is never uploaded.

Quick answer

To pixelate an image, upload it and choose a block size — larger blocks hide more detail. The tool shrinks the image down and scales it back up with smoothing turned off, producing the blocky mosaic effect used to censor faces, license plates, names, and other private information. It runs entirely in your browser, so the photo is never uploaded.

Formula & method

Pixelation works by downsampling: the image is drawn to a small off-screen canvas (its size set by your block value) and then drawn back to full size with image smoothing disabled. Disabling smoothing makes each shrunken pixel expand into a solid square block, which destroys fine detail — exactly what you want when censoring sensitive content.

Examples

Example 1: Censor a face
Input
Block size 20
Result
Heavily blurred mosaic
Why
A large block size makes faces unrecognizable.
Example 2: Light pixelation
Input
Block size 6
Result
Subtle mosaic
Why
Smaller blocks obscure less and keep more shape.
Example 3: Hide text or a plate
Input
Block size 30
Result
Unreadable blocks
Why
Very large blocks reliably hide numbers and text.

When to use this tool

  • Censoring faces, names, or license plates before sharing a photo.
  • Obscuring sensitive details in a screenshot.
  • Creating a retro or mosaic art effect.

Common mistakes

  • Using too small a block size, which leaves enough detail to still identify the subject.
  • Assuming light blur is irreversible — for true censoring, use a strong block size on the final export.
  • Pixelating the whole image when you only meant to hide one area (this tool pixelates the entire photo).

Frequently asked questions

How do I pixelate an image?

Upload it and drag the block-size slider; the preview updates live. Bigger blocks hide more detail. Then download the PNG.

Is it safe for censoring private info?

Use a large block size so detail is genuinely destroyed. Unlike a light blur, strong pixelation cannot be reversed to recover the original.

Does it pixelate the whole image?

Yes, this tool applies the mosaic to the entire photo. Crop to the region first if you only want to obscure part of it.

Is my photo uploaded?

No. The effect is applied locally on a canvas in your browser.

What format do I get?

A PNG image. The pixelation is baked in, so it can't be undone after download.

Can I use it on mobile?

Yes — it works in any modern mobile browser.

Sources & references

External references open in a new tab. We are independent and not affiliated with these organizations.

  • ✓ Free to use
  • ✓ No sign-up required
  • ✓ Runs entirely in your browser — nothing is uploaded.
  • ✓ Formula and method shown above
Last updated: How we calculateReport a correctionDisclaimer

Provided “as is” for general information only — results may be inaccurate, so verify before you rely on them. No warranty; use at your own risk.

Built and reviewed by HIFreeTools against the formula shown above and any authoritative references cited on this page. See our methodology and editorial standards.

Related tools

Embed this tool on your site

Free to embed, no sign-up. Paste this code where you want the pixelate image to appear: