Blur an Image
Blur the whole picture for a background effect, or draw a box over a face, a number plate or a document and blur only that. Nothing is uploaded, which matters when the thing you are hiding is sensitive.
Drop your image here
or
Choose ImageYou can also paste an image with Ctrl+V
Images are processed on your device and never uploaded.
• •
Runs on your device — nothing is uploaded.
Working…
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- Original
- Result
- Saved
- Quality
How to blur an image
- Select your photo.
- Choose Whole image or Selected area.
- For an area, drag a box over the region — add as many boxes as you need.
- Set the strength with the slider; the preview updates live.
- Press Apply and download.
Choosing a strength
| Radius | Effect | Use for |
|---|---|---|
| 1–5 | Softening | Reducing noise, gentle skin smoothing |
| 6–15 | Clear blur | Backgrounds, depth-of-field effects |
| 16–30 | Heavy blur | Obscuring identifiable detail |
| 31–50 | Unrecognisable | Complete redaction |
Blurring for privacy — do it properly
If you are hiding something rather than styling something, be aggressive. Weak blurs can sometimes be partially reversed, and text in particular survives light blurring far better than people expect.
- Use a radius of at least 25 for faces and at least 30 for text.
- Cover generously — a face is not just the face; hair, distinctive clothing and a name badge in the same frame all identify a person.
- Check the result at full zoom before you share it.
- Pixelation is safer than blur for redacting text and numbers, because it destroys information rather than smearing it. Use the pixelate tool when the stakes are real.
- Remember the metadata: a blurred photo with intact GPS coordinates still reveals where it was taken. Run it through the metadata remover as well.
Background blur
A true portrait-mode effect needs a depth map to know what is foreground. This tool applies a uniform blur, so for a background effect you draw the region yourself — which works well when the subject sits against a simple backdrop.
Frequently asked questions
Are my images uploaded to your server?
No. The image is decoded, processed and re-encoded by your own browser using the Canvas and Web Worker APIs. There is no upload endpoint for this tool — open your browser's network panel while you use it and you will see no request carrying image data.
Can a blur be reversed?
A light blur sometimes can be, at least partially — Gaussian blur is a mathematically invertible operation in principle, and there are known attacks on weakly blurred text. A heavy blur destroys enough information to be safe in practice, but pixelation at a large block size is the stronger choice for redaction.
Can I blur several faces in one photo?
Yes. Draw a separate box over each one; all boxes are applied together when you press Apply.
Is there automatic face detection?
Not yet. It is planned as an optional on-device model that would load only when you ask for it, so the privacy guarantee is unaffected. For now, boxes are drawn by hand.
What happens to my file when I close the tab?
It is gone. The image only ever exists in your browser's memory as an object URL; closing or refreshing the page discards it. Nothing is written to our servers, and nothing is stored on your device unless you download the result.