# Blur Photo Background Online - AI Portrait Mode Effect

> Free online background blur: AI finds the person, pet or product and blurs only the background for a DSLR look, or leaves the subject alone in colour.

- URL: https://qilingtools.com/en/image/blur-background
- Category: Image Tools (https://qilingtools.com/en/image)
- Tags: [Image](https://qilingtools.com/en/tags/image), [AI](https://qilingtools.com/en/tags/ai), [Photo Editing](https://qilingtools.com/en/tags/photo)
- Last updated: 2026-10-26
- Price: Free, no sign-up
- Privacy: Runs locally in the browser; files are never uploaded

Recreate the shallow depth of field of a wide-aperture lens. An AI model detects the subject — people, pets or products — keeps it sharp and blurs only the background, so the subject stands out. Besides blur, you can turn the background black and white while the subject keeps its colour (a colour-splash effect), or darken the background. Blur strength adapts to the image size, and batches are supported. The model runs in your browser, so photos are never uploaded.

## How to use

1. Drop in one or more photos
2. Choose blur, black & white or both, and adjust strength and darkening
3. Click Process and download

## Features

- AI subject detection, background-only effect
- Gaussian blur for a shallow-depth look
- Colour splash: background B&W, subject in colour
- Optional darkening, batch processing, runs locally

## FAQ

### There is a faint halo around the subject — why?

Strong blur can pull a little of the subject into the background around its edges. Lowering the blur or darkening the background slightly makes it look more natural.

### Which photos work best?

Photos where the whole subject is visible and clearly separated from the background — portraits, pet close-ups and product shots.

### Are my files or data uploaded?

No. Everything runs locally in your browser with no network upload, and is discarded when you close the page.

### Do I need to sign up or pay?

No. The site is completely free, needs no account and has no usage limits.

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