How to Make the Background of a Photo Blurry

The short answer

There are two ways to get a blurry background. You can create the blur when you take the picture, or you can add it afterward in an editor. Desktop programs, mobile apps and browser-based tools all use the same basic process. First you separate the subject from the background, then you blur only the background. The main difficulty is the edge between the two. Hair, glasses, hands and other fine detail are where automatic selection most often fails, so plan to check the edges and refine them.

Blurring the background while you shoot

A camera keeps only a limited zone of distance in sharp focus. This zone is called depth of field. When it is shallow, anything well in front of or behind the subject turns soft. You can make it shallower with these adjustments:

• Use the widest aperture your camera allows. This is the smallest f-number, and it narrows the zone that stays sharp.
• Increase the distance between the subject and the background.
• Move closer to the subject, or zoom to a longer focal length, then reframe.
• On a phone, use portrait mode. It imitates the effect with software, so the result depends on the phone and on how well it detects the subject's outline.

Blurring the background in a photo editor

If the photo is already taken, an editor can add the blur. The same order of steps works in most desktop and mobile editors that support selections or masks:

• 1. Keep a copy of the original, or work on a duplicate layer, so you can undo the edit.
• 2. Select the subject. Use an automatic subject or person selection if the editor offers one. Otherwise, trace the subject with a selection tool or masking brush.
• 3. Refine the edge. Zoom in on hair, ears, shoulders and the gaps between arms and body, and add or remove areas as needed. A slight feather softens the transition so the subject doesn't look like a hard cut-out.
• 4. Target the background. Either invert the selection or apply the blur on a masked layer that protects the subject.
• 5. Apply a blur filter. A Gaussian blur gives an even softness. A lens-style blur, if your editor has one, looks more like optical out-of-focus areas.
• 6. Set the strength. Start low and increase gradually, because heavy blur makes edge mistakes easier to see.
• 7. Export the result as a new file and keep the original.

Tool names and menu locations differ between editors and change between versions. This guide doesn't give exact menu paths, so check your editor's current documentation for where its selection, mask and blur tools are.

Using an online background blur tool

Browser-based tools usually automate steps 2 to 5. You upload the image, the tool detects the subject, and you adjust the strength of the blur. This is fast, but you have less control over the edge than with manual masking. Uploading also sends your image to a third-party service, so read its privacy terms before using it, especially for photos of other people. Some tools limit output resolution or add watermarks. No evidence was available here on specific tools, so compare these points yourself before choosing one.

How to check the result

• View the image at 100 percent zoom and follow the subject's outline all the way around.
• Look for a halo, which shows up as a glow or an unnaturally sharp line around the subject.
• Check that no part of the subject, such as a hand, an ear or loose hair, was blurred by mistake.
• Check the gaps, for example between an arm and the body, for background that stayed sharp.
• Judge the depth. In a real photo, areas near the subject's distance, such as the ground at their feet, are only slightly soft. A uniform blur across the whole background can look artificial, and a gradual blur usually looks more natural.

How the approaches differ

Method | When the blur is created | Control | Common weak point

Shallow depth of field in camera | At capture, optically | Set by aperture, distance and focal length | Cannot be changed afterward; parts of the subject may also go soft

Phone portrait mode | At capture, by software | Usually a strength setting; some phones allow later adjustment | Edge errors around hair and fine detail

Manual editing on desktop or in an app | After capture | Full control over the mask and the blur | Takes time; quality depends on the mask

Automatic online tool | After capture | Usually blur strength only | Edge errors; the image is uploaded to a service

Photo blur versus live webcam background blur

If you actually want a blurred background on video calls, the photo methods above don't carry over directly. Conferencing apps and virtual camera software separate you from the background in every frame, in real time. The same edge problems appear, and they are often more noticeable when you move. These effects change only the video image. They don't change which microphone is used or how your speech sounds. Call audio is controlled separately, through the audio input selected in your operating system and in the conferencing app.

Limits of this guide

No product-specific evidence was available for this guide. It therefore doesn't name or rank particular apps, quote prices, or report measured results. The steps describe general principles that apply to editors with selection, masking and blur tools, and you should confirm the exact controls in the software you use.