Blur an image online — blur part of a photo
Pick what kind of blur you want, then brush over or box off the part you want hidden. Everything is drawn on a canvas in this tab, so the file you load never leaves your device. What you see in the preview is what downloads.
Runs in your browser — your image is never uploaded.1 · Your image
Drop an image here
or click to choose · or paste with Ctrl + V
2 · How to blur it
What is true about this page
- All processing happens in your browser. The image is read from your disk into a canvas in this tab and encoded back in the same tab. There is no upload step.
- Your file is not sent to any server. Nothing is transmitted: no image data, no filename, no account. You can turn off your network after the page has loaded and the tool keeps working.
- Free, unlimited, no sign-up. No account, no email, no credits, no daily counter, no watermark on the download.
- One file at a time. This page blurs a single image per session — there is no batch mode, and this page does not pretend otherwise.
How to blur part of an image
Blurring is not a filter you apply to a whole photo and hope for the best. In most real jobs you want one area softened and the rest left exactly as it was: a face, a licence plate, an address, a badge, a document field, or the background behind something you want people to look at. That is what the two brushes on this page are for.
Brush paints a free stroke wherever you drag, which suits an irregular shape — hair, a hand, a logo on a curved surface. Box drags a rectangle, which suits anything with straight edges: a form field, a sign, a phone number on a label. In both cases the blur is applied only where you painted; the pixels outside your selection are untouched.
The four kinds of blur, and when each one is the right one
| Type | What it does | Use it when |
|---|---|---|
| Gaussian | Softens detail evenly in every direction, following a bell-shaped falloff. | You want something gone and do not want the edit to look like an edit. The default for faces, text and background softening. |
| Radial | Smears detail outward from a centre point, so the middle stays more readable than the edges. | You are hiding a small object or a reflection and want the surrounding area to stay recognisable. |
| Motion | Smears in one direction at an angle, imitating a fast pan. | You want a sense of movement, or you want to obscure something along a line rather than a blob. |
| Pixelate | Replaces each block of pixels with one flat colour, so detail becomes a grid of squares. | You want the scramble to be obvious, and you want it to survive being scaled up. A common choice for hiding identifying details. |
Where blur usually looks right
Flat backgrounds, skies, walls, out-of-focus areas, and anything you are deliberately hiding. Those are the places where smearing detail away reads as natural rather than broken.
Where a heavy blur still shows something
Strong shapes survive a soft blur: a bright window, a plain sign, the outline of a face. If the shape itself is the secret, blur alone may not be enough — check the preview, and go heavier, or use Pixelate.
Where blur is the wrong tool
Blur cannot be undone, and blurring does not put information back. If what you actually want is a sharper picture, this page does not do that, and no setting on it will.
What this page does, exactly
You load an image; the browser decodes it into a canvas. You paint a selection; the page computes the blurred version of the pixels under that selection, using the type and strength you picked. When you are happy, the same canvas is encoded into a new file and handed to your browser's own download. There is no model, no server round-trip, and no second copy of your picture anywhere.
Limits, stated up front
- One image at a time. There is no batch mode on this page.
- No account, and nothing saved. Close the tab and the work is gone; nothing is stored and there is no history to return to.
- The file-size ceiling is measured on this page. The exact number this page enforces is measured and printed below, not guessed.
- Animated images arrive as their first frame only. A GIF is decoded to a single still, because the canvas here holds one frame.
Does blurring an image send it anywhere?
No. The page reads your file with the browser's own file reader and draws it into a canvas in this tab. The blurred result is encoded in the same tab. No image data is posted to any server, and there is no upload endpoint for it to go to.
Can I blur only one part and keep the rest sharp?
Yes, and that is the point of the tool. Paint with Brush or Box, and only the pixels under your selection are changed. Everything outside it keeps its original values.
Which blur type should I pick?
Gaussian for a general, natural-looking soften. Radial when you want the middle to stay readable. Motion when you want direction. Pixelate when you want the concealment to be unmistakable and to hold up at any zoom. The table above goes through each one.
Can this page make a blurry photo sharp again?
No. This page blurs images; it does not sharpen them, and it has no setting that adds detail back. Blur discards information, and nothing here recovers it.
What image formats work?
Anything the browser can decode: JPEG, PNG, WEBP, GIF (first frame), BMP, TIFF, HEIC and AVIF. Output is PNG, WEBP or JPEG, whichever you choose.
Is there a file-size limit?
Yes, and it is printed on this page rather than guessed at. Very large files are refused with a message that tells you the number, so you find out before you start painting.