Pixelate Image

What is the Pixelate Image tool?

Pixelate Image is a free, browser-based editor for previewing a whole-image mosaic or covering selected areas. Pixelate creates a chunky visual-obfuscation effect. It should not be treated as guaranteed secure redaction because patterns may still reveal information. For passwords, account numbers, addresses, or other sensitive text and data, choose Solid redact to replace the selected pixels with opaque black. Everything runs on your device with canvas; the image is never uploaded.

How to use it

1. Add an image — tap or click the drop zone to choose a file, or drag and drop one onto it.
2. Choose Whole image for a full mosaic, or switch to Selected areas and drag across each part you want to cover.
3. For selected areas, use Pixelate for visual anonymization or Solid redact for sensitive text and data.
4. Adjust the block size, boxes, and effect while inspecting the live preview. Leave a margin around every secret.
5. Tap Download image only after the preview covers everything intended. The original file remains untouched.

How pixelation works

Pixelation is an averaging operation, not a blur. The tool reads the raw pixels of the selected region from the canvas, divides that region into a grid of square tiles whose side equals your chosen block size, and for each tile it computes the average colour of the pixels inside it. It then paints every pixel in that tile with that single average colour. The result is a grid of flat-coloured squares that throws away the fine structure that made text legible or a face recognizable at a glance. Pixelation is visual obfuscation, not a security guarantee: small or predictable blocks may still leak patterns. Use a generous block size for an artistic mosaic, and use Solid redact when the selected content is genuinely sensitive.

Selective region redaction

Selective redaction is the core feature. Instead of flattening the whole picture, you draw a rectangle over each thing you want to hide. The tool converts that on-screen box into the image's true pixel coordinates so the mosaic lands precisely even when the preview is shrunk on a small phone screen, then applies the chosen effect only inside the box. You can stack several boxes to cover a face and a name badge in the same shot. Solid redact writes opaque black into every selected pixel; always include a margin because anything outside the boxes remains visible.

Common use cases

People use this to censor screenshots before posting them: hiding a real name, email address, account balance, or order number in a support ticket or a tutorial. It is used to redact ID and document scans, such as passport numbers, national ID digits, and bank details, without sending the file to a third-party server. Photographers and journalists pixelate faces and license plates to protect bystanders. Sellers blur the address label on a parcel photo before sharing a shipping update. Anyone preparing an example image for a blog post or slide deck can mosaic the confidential bits in seconds.

Why use this one

This editor never uploads your image: the file is decoded and rendered locally in your browser. The live canvas shows the current effect before you save, and selected-area mode fails closed — download stays disabled until at least one box exists. Touch-safe handles make boxes easier to move, resize, or remove on a phone. Pixelate remains available for a mosaic look, while Solid redact provides an opaque overwrite for sensitive text or data. Exports keep the full source resolution, with no watermark or sign-up.

It is part of a small image toolkit. To trim a picture down to one area, use the Image Cropper; to change its pixel dimensions, use the Image Resizer; and to shrink its file size, try the Image Compressor.

Frequently asked questions