Background Blur

Blur the background of a photo and keep the subject sharp — the portrait-mode look, from any photo. An open-source model finds the subject in your browser, so the picture is never uploaded. Adjust the strength after the fact without waiting again.

Private by design: Your photo is processed by an AI model running in your browser and is never uploaded. The model is the same one the Background Remover uses, downloaded once from Hugging Face and cached on your device. See how in-browser processing works.

How to blur a photo background

Drop a JPG, PNG, or WebP onto the upload area, or click to browse.
Pick a strength and press Blur background. The first run downloads the model — the same one the Background Remover uses, so if you've used that, it's already here.
Change the strength if you like; the subject only has to be found once. Download the PNG when it looks right.

How it finds the subject

The tool uses MODNet, the same open-source matting model behind our Background Remover. It predicts, for every pixel, how much belongs to the subject. Instead of making the rest transparent, this tool blurs the original photo and lays the sharp subject back on top. Because the edge is a soft blend rather than a hard cut, hair and clothing edges fade naturally into the blurred background.

MODNet is trained on people, and that is where it is reliable. It often handles a clear single object on a plain background too, but products, animals, and busy scenes are not what it was built for — try it, and check the edges before relying on the result.

What it won't do

This is not a depth-of-field simulation. A camera blurs things more the further they are from the subject; this tool blurs everything that isn't the subject by the same amount. On most photos that reads as a natural portrait effect. On a photo with objects very close behind the subject, the uniform blur can look slightly cut-out.

Segmentation is not perfect. Fine hair against a busy background, transparent objects, and photos with several equally prominent people can confuse the model, and you may see a soft halo or a blurred edge on part of the subject. When that happens the honest fix is a different photo or a dedicated editor — we won't pretend otherwise.

Blur strength

Light, medium, and strong are relative to the image size, so medium looks the same on a phone photo and a full-resolution one. Light suggests a busy background without hiding it; strong makes it unreadable — useful when the background contains things you'd rather not share, such as screens, documents, or other people. For hiding faces specifically, Privacy Blur targets them directly.

Good to know

Output is a PNG at the original dimensions. Blurred areas compress well, so the file is often smaller than a JPG of the original — and the Image Compressor can shrink it further.
The model stays loaded between photos, and changing the strength never re-runs it, so experimenting is quick.
To remove the background entirely instead of blurring it, use the Background Remover — it's the same model.
Your photo is processed on your device and never uploaded. The model file comes from Hugging Face and is cached after the first download.
How to blur the background of a photo covers which photos suit it, how strong to go, and how to spot a bad mask.

Frequently asked questions

Is my photo uploaded to blur the background?

No. The model runs inside your browser and the photo never leaves your device. The only download is the model itself, from Hugging Face, which contains nothing of yours — and it's the same file the Background Remover uses, so one download serves both tools.

Does it work on things other than people?

Sometimes. MODNet is trained for portraits and is most reliable on them. A clear single subject on a plain background often works; products, animals, and cluttered scenes are hit and miss. Check the edges in the result.

Why does part of my subject look blurred too?

The model was unsure where the subject ended — this happens most with fine hair against a busy background, transparent or reflective objects, or when the subject and background are similar in colour. Try a lighter strength, which makes the mistake less visible, or a photo with a cleaner edge.

Can I blur only part of the background?

Not with this tool — it blurs everything the model considers background by the same amount. For hiding specific things like faces, use Privacy Blur, which lets you choose exact areas.

Why is the result a PNG?

PNG keeps the model's soft subject edge exactly. Because most of the image is now smooth blur, the PNG is usually not large — and you can compress it further with the Image Compressor if you need to.

Guides for this tool

How to Blur the Background of a Photo — A blurred background does two things at once: it makes the subject stand out, and it hides whatever was behind them — the messy desk, the other people, the screen you'd rather not show. Phones fake it with a depth sensor. In a browser, a model finds the subject and does the rest.
How to Remove the Background from an Image — You want the subject without whatever is behind it — for a product listing, a profile picture, a slide, or a sticker. Here is how to do it in a browser without sending the photo anywhere, and how to tell in advance whether it will work well.
How to Blur Faces in a Photo Before Sharing It — The photo is good and you want to post it. It also has your kid's classmates in it, or colleagues who didn't sign up to be on your feed, or a stranger who happened to be in frame. Blurring their faces lets you share the moment without publishing their identities. Here is how to do it properly — including the part where you check the tool's work.

Background Blur is one of 4 AI tools — remove or blur backgrounds, hide faces, and upscale — models run on your device.