EDIT
☞ runs entirely in your browser — nothing is uploadedDrop your image here
or click to browse — JPG, PNG, WebP
Paint blur on the image
OneImageTool
Free Image Tools
EDIT
Paint over the parts that should not be readable.
or click to browse — JPG, PNG, WebP
Paint blur on the image
covering is not removing
The instinct is to draw a rectangle over whatever should not be seen. In a layered editor that rectangle sits on top and the original pixels are still in the file until it is flattened; more than one leak has come from a redaction that was moved aside or from a thumbnail generated before it was applied. A blur brush works differently: the pixels under the brush are replaced in the canvas itself, and the export is made from that canvas.
Strength matters as much as coverage. A light blur on small text is reversible in principle — the letter shapes survive well enough that software can guess at them. If the point is that something must not be readable, use a strong blur over a generous area rather than a delicate one exactly on the words, and check the result at full size before you share it. For faces in a crowd or a plate on a parked car, a heavy blur across the whole region is the right answer.
three steps
JPG, PNG or WebP. It is decoded in the page and never uploaded.
Set the brush size and blur strength, then drag across the area. Strokes stack, so going over the same spot again makes it stronger.
The exported file contains the blurred pixels — there is no layer to peel back.
quick answers
Not from the exported file. The pixels are replaced on the canvas before export, so there is no hidden original underneath. What can happen with a weak blur is that software guesses at what was there — which is a reason to blur strongly, not a reason to distrust the export.
Both replace the pixels. Blur looks softer and is the usual choice for faces and backgrounds; mosaic reads more clearly as "deliberately hidden", which is sometimes what you want. The pixelate tool is the same brush with a mosaic core.
Strong enough that you cannot read or recognise anything at full size after exporting. If you can still make out the shape of a letter or the line of a jaw, go heavier and cover a wider area than feels necessary.
No. Blurring changes pixels, not the EXIF block — a photo can still carry the GPS coordinates of where it was taken. Run it through the EXIF remover as well if that matters.
There is a reset that clears every stroke and returns to the original image. Individual undo is not there; for a small correction, reset and repaint, which on a short session is faster than it sounds.
No. The image is decoded, painted and re-encoded in your browser. That matters here more than on most tools — the images people blur are exactly the ones they would not want on a server.