Blur Image
Add an adjustable Gaussian blur to any picture directly in your browser, without uploading it anywhere.
Processed on your device — nothing is sent anywhere.
How it works
- Drop an image onto the tool or click to pick one from your device.
- Move the strength slider; the blur is applied to the preview instantly.
- Choose PNG or JPG as the output format and click Download to save the blurred image.
Frequently asked questions
- Is my image uploaded to a server?
- No. The image is opened and blurred entirely inside your browser using the canvas element, and the download is generated on your device. Nothing leaves your computer, so the tool also works offline once the page has loaded.
- What does the blur strength number mean?
- It is the radius of a Gaussian blur in pixels, applied at the image’s original resolution. Small values around 2 to 5 px gently soften details, while values above 15 px make text and faces effectively unreadable. Because the radius is measured on the full-size image, the preview may look slightly sharper when it is scaled down to fit your screen.
- Should I download as PNG or JPG?
- PNG is lossless and keeps any transparent areas of the original image, which makes it the safer default. JPG usually produces a much smaller file, but it does not support transparency, so transparent regions are flattened onto a white background.
- Can I blur only part of an image, like one face or a name?
- This tool blurs the whole picture, which is what you want for backgrounds, wallpapers, and overlays. To hide specific regions — faces, license plates, or a line of text — use the Censor Photo tool on this site instead, which lets you draw boxes and blur or pixelate just those areas.
- Which image formats can I open, and is there a size limit?
- Anything your browser can display works: JPG, PNG, WebP, GIF, and usually AVIF. There is no fixed file-size limit, though very large images are constrained by your device’s memory rather than by the tool. Animated GIFs are blurred as a single still frame.
About this tool
This tool applies an adjustable Gaussian blur to an entire image and exports the result as a new file. Drop in a picture, drag the strength slider anywhere from a subtle 1 px soften to a heavy 40 px wash, and download the outcome as PNG or JPG. The preview updates in real time, so finding the exact amount of blur is a matter of seconds rather than repeated exports.
Processing is fully client-side: the image is drawn to a canvas element in your browser and the blur filter is computed by your own machine’s graphics stack. No upload takes place, no server ever sees the picture, and the page keeps working offline once it has loaded. For screenshots containing account details or photos of people, that privacy property is the practical difference between this and upload-based editors.
Whole-image blur has more uses than it first appears. Designers blur photos to create backgrounds that keep their color mood without competing with foreground text — the standard treatment for hero sections and slide backdrops. A blurred version of an image also works as a spoiler cover, a tasteful placeholder while content loads, or a way to publish a teaser of work in progress. And because the blur is applied at the image’s native resolution, the export holds up at full size, not just in a thumbnail.
Some practical guidance: for a background image behind text, 8 to 15 px usually reads well; below that, detail distracts, and far above it the image turns to flat color. If your goal is to make text or a face unrecoverable, go past 20 px — light blurs on short text can sometimes be reversed by reconstruction techniques — or use pixelation via the censor tool. Choose PNG when the source has transparency; choose JPG for photographs where file size matters.