Full Page ScreenshotHow to blur part of an image
- Choose an image, drop it onto the page, or paste a screenshot with Ctrl+V (Cmd+V on a Mac).
- Pick an effect: Blur for a soft smudge, Pixelate for a mosaic, or Black out for a solid block.
- Drag a box over each part you want hidden. The effect is applied as soon as you let go. Undo removes the last box.
- Download the result as PNG or JPG.
Blur, pixelate or black out: which one hides more?
A solid block is the only option that removes the information completely. Blur and pixelate leave a trace of the original: at low strength, short text and large numbers can sometimes still be read, and heavily pixelated faces have been reconstructed in research. For anything sensitive, such as a password, a card number or a document you must redact, use Black out or set the strength to 10. Blur and pixelate are fine for faces in a crowd, usernames in a screenshot of a chat, or details you want to de-emphasise rather than destroy.
Why the image is not uploaded
Most online blur tools send your picture to a server, process it there and send it back. That is a strange thing to do with an image you are blurring precisely because it contains something private. This tool does all of its work with your browser's own drawing functions, so the file stays on your computer. You can turn off your internet connection after the page has loaded and it still works.
Blurring screenshots of webpages
If the picture is a screenshot of a webpage, the Full Page Screenshot extension can capture the whole page, including the parts below the fold, and blur the sensitive parts in the same editor before you save. Its blur is written into the exported file, the same as here. The guide to taking a full page screenshot in Chrome covers the capture step.
FAQ
Can a blurred image be unblurred?
Sometimes, if the blur is light. Blurring averages nearby pixels, and software can partly reverse a weak blur on text with a known font. A strong blur, a coarse pixelation or a solid block cannot be reversed. When it matters, black it out.
Does the tool work on phones?
Yes. Choose or paste the image, then drag with your finger. On a phone the preview is scaled down to fit, but the download is at the image's full size.
What is the largest image it handles?
Anything your browser can open, which in practice means screenshots of any length and photos up to tens of megapixels. Very large images take a moment to process on older phones.
Is the quality reduced?
PNG keeps every pixel outside the boxes exactly as it was. JPG re-compresses the whole image at high quality, which makes a smaller file. Choose PNG for screenshots with text.