Blur Image Online — Free Image Blur Tool

Apply Gaussian blur to images online. Adjust blur intensity with a slider. Free, browser-based.

Processed entirely in your browser — never leaves your device

No software needed — works in any modern browser

Fast — most operations complete in under a second

Files up to 100MB supported

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✅Processed entirely in your browser. Your file never leaves your device — no upload, no server, complete privacy.

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Blurring an image has many practical applications: obscuring sensitive information (faces, license plates, addresses) in screenshots or photos, creating a depth-of-field effect, reducing noise in a scanned document, or creating a soft background for a composite image. This tool applies a Gaussian blur using the browser's native CSS filter, which is hardware-accelerated and produces smooth results. Adjust the intensity from a light 1px blur to a heavy 20px blur.

How to use

Click 'Choose Image' and select the image you want to blur.
Use the slider to set the blur intensity (1–20px). Higher values produce stronger blur.
Click 'Apply Blur' and download the blurred image.

FAQ

What blur algorithm is used?

This tool uses the browser's native CSS blur filter, which applies a Gaussian blur. Gaussian blur is a smooth, natural-looking blur that approximates the diffusion of light — the same algorithm used by Photoshop's Gaussian Blur filter and most professional image editors.

How much blur intensity should I use?

For light noise reduction or a subtle soft-focus effect: 1–3px. For obscuring small text or minor details: 5–8px. For obscuring faces or sensitive text: 10–15px. For a heavy frosted-glass or out-of-focus background effect: 15–20px. Results depend on the image resolution — higher-resolution images may need stronger blur to achieve the same visual effect.

Can I blur only part of the image?

This tool blurs the entire image. For selective (partial) blur — for example, blurring only a face — you would need a tool that supports selection masks or layers, such as Photoshop, GIMP, or Canva.

Does blurring reduce file size?

Usually yes. Blurred images compress more efficiently than sharp images, particularly with JPEG compression. A blurred image may be 20–50% smaller than the original at the same JPEG quality setting.

What formats are supported?

JPEG, PNG, and WebP images up to 100MB are supported. The output format matches the input format.

Is the blurring done in my browser or on a server?

Blurring runs entirely in your browser using the Canvas API with the CSS filter property. Your images are never uploaded to any server.