Add mosaic to an image to hide faces, names, addresses, and other private details by blurring or pixelating a selected area, or the whole image. Draw the area right on the preview and save the result you see.
How to blur or mosaic an image
- Upload a PNG, JPG, or WebP image.
- Choose Selected area or Whole image.
- For Selected area, drag a rectangle over the part you want to hide.
- Choose Blur for a soft redaction or Pixel mosaic for blocky pixels.
- Move the strength slider and check how the mosaic looks in the preview.
- Press Save to download the mosaicked image.
The preview shows the actual edited result, so what you see is exactly what gets exported — there is no separate step to preview it. Your image is processed locally with the browser canvas API. Nothing is uploaded, and no account or credits are required.
Which mosaic mode should I use?
| Mode | Best for | Result | Notes |
|---|---|---|---|
| Blur | Faces, names, email addresses, screenshots | Smooth hidden area | Usually cleaner when the image will be shared professionally |
| Pixel mosaic | Classic mosaic effect, casual sharing, visual censoring | Blocky pixelated area | Increase strength for larger blocks |
| Whole image | Backgrounds, previews, low-detail thumbnails | Effect covers every pixel | Useful when the whole image should become less readable |
| Selected area | Private details in an otherwise useful image | Only the marked rectangle changes | Best when you need the rest of the image to stay clear |
Example input and output
Input: a screenshot that contains a customer name and email address. Settings: Selected area, Blur, 24 px strength. Output: the screenshot keeps its layout and visible context, while the selected customer details are blurred before download.
Tips for hiding information reliably
To make sure hidden details cannot be read back, keep these in mind:
- Turn the strength up enough. A weak blur can leave text or faces faintly readable. For private data, raise the strength until the original content is no longer recognizable.
- Use pixel mosaic for text. Small text is often hidden more reliably by a coarse pixel mosaic, which leaves less of its shape behind.
- Review the preview before saving. Zoom in and confirm nothing can be read before you press Save.
- Cover a bit more than the detail itself. Draw the selection slightly larger so information near the edges is not left exposed.
The exported image has the mosaic baked in, and the original pixels cannot be recovered from it. If you don't want to keep the original, delete the source file after saving.
Limitations
Animated formats (such as GIF) are treated as a still image by the browser canvas, and only a single frame is exported.