Local pixelation — zero data leaves your device
The mosaic effect is rendered with the Canvas API directly in your browser. No server roundtrip, no cloud processing, no privacy risk.
Pixelate any area of an image
free, private, no upload
Turn any part of an image into a pixel mosaic without uploading it. RedactPix applies pixelation locally in your browser — draw a box, pick mosaic, adjust the block size, and export a flattened PNG.
Drop image here or paste a screenshot
JPG · PNG · WEBP — up to 20 MB · No upload, no account
- No upload
- No account
- Local AI scan
- Free
Why use RedactPix to pixelate image?
Adjustable block size
Control the pixel grid from fine (8px) to chunky (48px). Larger blocks obscure more detail; smaller blocks give a subtle retro effect.
Works on photos, screenshots, and documents
JPG, PNG, WEBP — up to 20 MB. Pixelate faces in photos, redact text in screenshots, or scramble license plates in street shots.
How to pixelate image — step by step
From raw image to safely redacted file in four steps.
Step 01
Upload your image
Choose a file, drag it in, or paste a screenshot. The image opens directly in your browser — nothing is uploaded.
Step 02
Draw over the area
Drag to create a box over the region you want pixelated. Or use Scan to auto-detect faces and sensitive text first.
Step 03
Choose Mosaic and adjust
Select "Mosaic" from the masking toolbar. Adjust the block size slider to control how chunky the pixelation looks.
Step 04
Download the final image
Export a single PNG with the mosaic baked in. Metadata is stripped automatically — the result is a clean, shareable file.
Frequently asked questions
Is pixelation better than blur for privacy?
Pixelation (mosaic) and blur both obscure detail, but pixelation with large blocks is harder to reverse-engineer than a light blur. For maximum security with text, use a solid black box.
Can I pixelate specific text in a screenshot?
Yes. Click "Scan for Private Info" and RedactPix detects emails, phone numbers, URLs, and ID-like numbers using on-device AI, then suggests boxes you can review.
What is the difference between pixelate and mosaic?
They are the same effect — replacing a region with large, blocky pixels. RedactPix labels it "Mosaic" in the toolbar, but the technique is identical to pixelation.
Can I undo pixelation?
Within the editor, yes — each box is independent and removable until you export. Once you download the flattened PNG, the pixelation is permanent and irreversible.