About the free image blur tool
This tool applies a true gaussian blur to your image, the same soft, natural falloff you get from a defocused camera lens or from the blur filter in professional editors. It runs entirely in your browser: the image is decoded on your device, blurred by a fast three-pass algorithm, and re-encoded locally, so nothing is ever uploaded and the result is mathematically identical in every browser. Because no server touches your files, there are no daily limits, no queue, and no account. One thing to know up front: it blurs the entire image. That is exactly what you want for backgrounds and privacy screenshots, and we explain below what to use instead when you only need one region hidden.
Blurring for privacy and anonymization
A light blur is not a redaction. Faces and text that have been softly blurred can sometimes be reconstructed, because a weak blur leaves most of the original information in place. If you are hiding something that matters, push the strength to 20 or higher and check that you genuinely cannot make out the content at full zoom. For censoring a specific region such as a face, a license plate, or an address while keeping the rest of the image sharp, pixelation is usually the better tool, since large blocks destroy the underlying detail completely. Our free image pixelator does that with an adjustable block size, also fully in your browser.
Blurred images as backgrounds
The most popular use of a full-image blur is design, not privacy. A strongly blurred photo makes an excellent background for text: website heroes, presentation slides, YouTube thumbnails, lock screens, and social banners all read better when the backdrop is a soft wash of color instead of competing detail. A strength of 12 to 20 keeps a hint of the original scene, while 30 and above turns the photo into a pure color gradient. A nice workflow for portraits: remove the subject with the free background remover, blur a copy of the original here, then layer the sharp subject back over the blurred background for an instant depth-of-field look.
Formats, limits, and smarter edits
The tool accepts JPG, PNG, WebP, AVIF, GIF, BMP, and HEIC images up to 64 megapixels on desktop and 16 megapixels on iPhone and iPad. The output keeps your input format where possible, so PNG stays lossless PNG and photos stay JPG or WebP at high quality, and it never carries a watermark. If what you actually need goes beyond a uniform blur, replacing the background entirely, removing an object, or restyling the photo, that is AI editing territory: try the free AI image editor for prompt-based edits, or Upsampler's premium tools for the highest quality results at full resolution.