Portrait mode is a trick, and a good one: phones cannot produce the shallow depth-of-field of a big lens, so they detect the subject with a neural network and blur everything else. Once you know it is software, the obvious question follows — why only at capture time? The answer is: no reason. The same trick applies to any photo you already have.
The flow
- Open Blur Background and drop the photo. The AI masks the subject automatically.
- Set the blur strength — the preview re-renders live; 20–30 px is the classic look.
- If edges need tuning (hair especially), adjust edge hardness and smoothing, or switch to the HD model.
- Download at full resolution.
AI segmentation in your browser — the photo never leaves your device.
What a blurred background buys you
Two things. Attention: the eye goes to whatever is sharp, so the subject stops competing with the room behind it. And privacy of a practical kind: the messy desk, the whiteboard with plans on it, the strangers in frame — all dissolve into colour. For profile photos it flatters; for product shots it is the difference between "photo of my kitchen with a mug in it" and "photo of a mug".
Blur, remove, or replace?
Same engine, three finishes. Blur keeps context softly present — the natural look. Remove gives transparency for designs and listings. A solid colour (an option on both tools) gives the catalogue look. If the goal is a round profile picture at the end, finish with the circle crop, and size it per platform with the social resizer.