How do I blur an image?

Drop your photo onto the upload zone (or click to browse, or paste with Ctrl+V / Cmd+V), then drag the strength slider to set how much blur you want — the preview updates live. Press Export, choose JPEG, PNG, or WebP, and download. It is completely free and runs entirely in your browser via the Canvas API, so your image is never uploaded.

Are images uploaded to a server?

No. All processing runs entirely in your browser; images never leave your device. This is the core design principle of the tool.

Is applying a gaussian blur to an image free?

Yes — blurring your image is completely free, forever, with no account, no sign-up, and no limit on how many photos you blur. The gaussian blur is applied entirely in your browser using the Canvas API; your images are never uploaded to any server. The site is ad-supported.

Does it work offline?

Yes. The tool uses the Canvas API and needs no server connection. Disconnect after loading the page and it still works.

What image formats are supported?

Input: JPEG, PNG, WebP, AVIF (browser-decoded). Output: JPEG, PNG, WebP.

Can I blur just one area, like a face?

This tool blurs the whole image. For hiding a specific region, use the Redact tool to pixelate or block out a selected area; a dedicated face-blur tool is on the roadmap.

Does the blurred preview match the download?

Yes. The slider sets the blur radius in full-resolution pixels, and the preview scales the radius to its smaller size, so what you see is what you export.

Blur Image (Gaussian)

Blur Image is a free browser-based tool that applies an adjustable gaussian blur to a whole photo. Load a JPEG, PNG, or WebP, drag the strength slider to set the blur radius in pixels, see the live preview, and download — processing runs entirely on your device with no upload and it works offline.

Apply an adjustable gaussian blur to any image directly in your browser — free, no upload required.

100% Free — Forever. No fees, ever.
Private: files are processed locally in your browser and never sent to a server.
No upload, no account, no sign-up.

How do I blur an image?: Drop your photo onto the upload zone (or click to browse, or paste with Ctrl+V / Cmd+V), then drag the strength slider to set how much blur you want — the preview updates live. Press Export, choose JPEG, PNG, or WebP, and download. It is completely free and runs entirely in your browser via the Canvas API, so your image is never uploaded.
Are images uploaded to a server?: No. All processing runs entirely in your browser; images never leave your device. This is the core design principle of the tool.
Is applying a gaussian blur to an image free?: Yes — blurring your image is completely free, forever, with no account, no sign-up, and no limit on how many photos you blur. The gaussian blur is applied entirely in your browser using the Canvas API; your images are never uploaded to any server. The site is ad-supported.
Does it work offline?: Yes. The tool uses the Canvas API and needs no server connection. Disconnect after loading the page and it still works.
What image formats are supported?: Input: JPEG, PNG, WebP, AVIF (browser-decoded). Output: JPEG, PNG, WebP.
Can I blur just one area, like a face?: This tool blurs the whole image. For hiding a specific region, use the Redact tool to pixelate or block out a selected area; a dedicated face-blur tool is on the roadmap.
Does the blurred preview match the download?: Yes. The slider sets the blur radius in full-resolution pixels, and the preview scales the radius to its smaller size, so what you see is what you export.

A gaussian blur convolves each pixel with a bell-curve kernel; a larger radius averages over more neighbouring pixels, producing a stronger, smoother blur.
The CSS/Canvas filter blur() radius is the standard deviation of the gaussian in CSS pixels, as defined by the W3C Filter Effects specification.
Blurring is lossy and not securely reversible for sensitive data — a very large radius is needed to truly destroy text or faces, which is why dedicated redaction is recommended for privacy.
The Canvas filter API is supported in all modern browsers (Chrome, Firefox, Safari, Edge).
Because the blur runs client-side, the image is never transmitted, so it suits personal photos and confidential screenshots.

💨 Blur Image (Gaussian)

Blur Image (Gaussian)