Does this upload the screenshot anywhere?
No. The screenshot stays in the browser while you blur the selected area and export the cleaned file.
When is blur better than pixelate?
Blur is better when you want the screenshot to stay visually smooth and the redaction should feel softer than a hard pixel block or box.
Does export remove metadata too?
Yes. The export is regenerated through canvas, which strips common source metadata before the new file is downloaded.
Is blurring a screenshot safe?
For text, no. Screenshots use known system fonts at known sizes, which is exactly the situation in which blur reversal works. Publicly available tools have recovered blurred and pixelated text from screenshots. If the content matters, use an opaque box.
What is blur actually good for on a screenshot?
Faces in a call grid, avatars, thumbnails, a background window whose contents are not confidential, or anything you want softened so the reader's eye goes to the part you are demonstrating.
Does the exported file keep the original pixels under the blur?
No. The screenshot is drawn into a canvas, the blur is applied to those pixels, and a new file is encoded. There is nothing underneath and no way to peel it back.
Does exporting strip the screenshot's metadata?
Yes, as a side effect. Re-encoding from a canvas produces a file with no EXIF, which drops anything the original carried, such as a device model or a timestamp.
What should I use instead for an account number?
A black box. Use the redact screenshot page, which exposes the black box, white box, pixelate and crop modes, and put an opaque rectangle over the number.