How to blur part of an image
- 1To blur an image online, drag a picture onto the Image box or click it to choose one. PNG, JPG and WebP files are saved in the same format afterwards.
- 2To blur part of image content, leave Apply to on Selected areas and drag across the picture to draw a box over what you want to hide. Draw as many boxes as you need, then move or resize them with the handles.
- 3Set the Blur strength with the slider and watch the preview update. Pick Whole image instead to blur the entire picture.
- 4Press Download blurred image to save it. The file is named after the original with -blurred added, so your original is never changed.
How blurring an image works
Blurring replaces each pixel with an average of the pixels around it. The wider the area that is averaged, the softer the result, which is what the strength slider controls. This tool uses repeated box blurs, a fast method that closely matches a Gaussian blur, and it does the arithmetic itself rather than relying on a browser feature, so the result looks the same in every browser, including older Safari.
It is the usual way to blur picture details and protect privacy: a face in the crowd, a number plate, an address on a letter, a name on a screen. Each box is blurred using only the pixels inside it, so color doesn't bleed in from around the edges. You can combine several boxes in one picture, and the whole image can be blurred instead for a soft, out-of-focus look or a background for text.
The strength is relative to the size of the picture, so a setting looks the same on a phone photo as on a thumbnail. For hiding sensitive details, use a high setting. A light blur only softens detail and can sometimes be partly reversed with specialist software, so for text, plates and faces choose a strong blur or use the pixelate tool, which discards the detail more completely.
The picture is processed on your device. To blur photo files, it is drawn to a canvas, blurred there and saved in its original format, with a quality slider for JPG and WebP. The saved file carries no camera or location data, because only the pixels are written. Nothing is uploaded and there is no watermark or account.
When people blur parts of a picture
Hiding faces
Blur face in photo shots of children, bystanders or screenshots before posting them online.
Covering plates and documents
Blur license plates, addresses, card numbers or ID details before a picture is shared or sold.
Softening a background
Blur background areas to focus attention on the subject, or to put text over a calmer picture.
Redacting screenshots
Blur names, emails or keys in a screenshot you are sending to a team or a support desk.
Frequently asked questions
How do I blur part of an image?
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Add the picture, drag a box over the part to hide, set the strength and download. You can draw several boxes.
Can I blur a whole image?
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Yes. Choose Whole image under Apply to and the whole picture is blurred with the strength you set.
Is blurring a safe way to hide text or faces?
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A strong blur hides most details, but a light one can be partly recovered. For sensitive information use a high strength or the pixelate image tool.
Will the image lose quality?
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Only the areas you blur change. JPG and WebP are saved again at the quality you choose, and PNG stays lossless.
Is my photo uploaded?
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No. The picture is blurred in your browser and never leaves your device.
Related tools
Pixelate Image
Pixelate a whole photo or selected areas such as faces, plates and text, with an adjustable block size. Runs in your browser; nothing is uploaded.
Crop Image
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Image Resizer
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Image Compressor
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Image Converter — WebP, PNG & JPG
Convert PNG, JPG, WebP, GIF, and BMP images to WebP, JPEG, or PNG with an adjustable quality slider. Batch-convert multiple files at once with live size comparison. Everything runs in your browser — no uploads, no size limits.