Blur Image Online in Your Browser

Open a picture, mark the areas that should not be readable, and pick blur, pixelate or a solid block for each one. Your browser opens the file and writes the masked copy, so nothing is sent anywhere.

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The picture

Drop a picture here

PNG, JPEG, WebP or GIF, up to 16,777,216 pixels in total.

Everything runs in your browser. Nothing is uploaded.

What the mask puts in place of the pixels

For blur and pixelate the marked rectangle is redrawn from a copy one twelfth of its width and height, so detail finer than that no longer exists in the file rather than being covered over. Blur resamples that copy smoothly, while pixelate keeps the hard blocks so the masking reads as deliberate. A solid block fills the rectangle with black and leaves nothing to interpret, which is what to prefer for anything that must never be guessed at.

Marking a region without a mouse

The canvas takes focus from the Tab key, and Enter places a rectangle in the middle of the picture. The arrow keys move it, Shift with the arrow keys resizes it, and Delete takes it away again. Every region is listed underneath with its style and its size in pixels, so the result can be checked without seeing the picture at all.

What the saved file contains

The saved file is a PNG at the source resolution, composed from the flattened canvas, so there is no separate overlay and no second layer. Because the picture is re-encoded rather than edited in place, the EXIF block a camera or a phone wrote is not carried over either, and that includes any location it recorded.

Questions about masking a picture

Yes. Mark as many rectangles as you need, and give each one its own style, so a face can be blurred while a serial number in the same picture is covered by a solid block. Every rectangle is listed below the canvas with its style and its size.

No. Each masked rectangle is written over the pixels themselves before the file is encoded, so the saved PNG is a single flat layer with nothing underneath it to peel away. For blur and pixelate the detail is discarded rather than covered, and a solid block leaves nothing at all.

Up to 16,777,216 pixels in total, which is width multiplied by height rather than either side on its own. A larger picture is refused instead of being quietly scaled down, because scaling it would change the file you were trying to keep.

Yes. Anything your browser can open as an image works the same way, whether it came from a camera, a phone or a screen capture. A photograph usually wants the solid block or pixelate for a face, because a gentle blur on a small face can still leave it recognisable.

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