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pixelate-jpg

Pixelation reduces an image to a grid of large squares — each square is the average colour of the original pixels it covers. It's used to censor faces / license plates / sensitive info, and as an aesthetic effect in retro-game art. The ZTools Pixelate JPG tool offers two modes: full-image pixelation (the whole image becomes mosaic) and region pixelation (drag a box; only that region pixelates). Block size is configurable (4 px to 64 px).

Use cases​

Censor faces in a screenshot​

Sharing a UI screenshot publicly — colleagues' faces visible. Drag a box, pixelate, save.

Hide license plates / addresses​

For a real-estate / car listing where the plate / number shouldn't be public. Region pixelation with block size 16-24 px.

Retro-game art aesthetic​

Convert a modern photo to 8-bit-style art. Whole-image pixelation at block size 12-20 px gives the chunky pixel look.

Privacy in a generic stock photo​

Even stock-photo people sometimes deserve privacy. Light pixelation on faces preserves composition without identifying anyone.

How it works​

  1. Pick JPG — Loaded into canvas.
  2. Pick mode — Whole image OR drag a region. Multiple regions can be pixelated independently.
  3. Block size — 4 px (subtle) to 64 px (extreme). 16 px is a good censor default.
  4. Save — New JPG with pixelation baked in.

Examples​

Input: Selfie, region around face, block size 16

Output: Face becomes a 6×6-grid mosaic. Identity not recoverable; surrounding image untouched.

Input: Whole 800×600 photo, block size 20

Output: 40×30 grid of coloured squares. Strong retro-game aesthetic; original details lost.

Input: License plate, block size 24

Output: Plate text unreadable. Surrounding car still visible.

Frequently asked questions​

Is pixelation reversible?

No — averaging is lossy. Even ML "depixelation" only invents plausible content; it can't recover the original. Heavy pixelation (block size ≥ 16) is considered safe censorship.

How big should the block be for censoring faces?

16-24 px on a typical web-resolution image. The face must lose recognisable features (eyes, mouth shape, hairline detail).

Is pixelation as good as a black bar?

Black bar / solid fill is provably destructive. Pixelation can leak some info if the block size is too small. For high-stakes content (legal, witness protection), use a black bar.

Can it pixelate inside a shape (e.g. circle around a face)?

Rectangle regions only in this tool. For more precise shapes, mask with another image-editor first.

Privacy?

All processing in browser. Sensitive images never leave the device — the entire point.

Tips​

  • For censorship, block size 16+ px on faces and 24+ px on text. Test by zooming — if you can read it, increase block size.
  • Combine pixelation with a slight blur for extra security — pixelation alone can sometimes be partially reversed by ML models.
  • For retro aesthetic, also reduce the colour palette — pixelation alone with full 24-bit colour looks plastic, not retro.
  • Always pixelate a copy — censorship is irreversible and you might need the original.

Try it now​

The full pixelate-jpg runs in your browser at https://ztools.zaions.com/pixelate-jpg — no signup, no upload, no data leaves your device.

Open the tool ↗

Last updated: 2026-05-06 · Author: Ahsan Mahmood · Edit this page on GitHub