How to Change Your Slack Video Call Background

In current versions of Slack, video calls take place in huddles. When your camera is on in a huddle, the desktop app usually lets you blur what is behind you or replace it with an image. This guide shows how to find that setting, use your own picture, check the result and fix the most common issues. Slack updates its interface often, so the labels on your screen may differ slightly from the ones described here.

Before you start

Check these points first. They prevent most cases where the background option is missing or the camera does not appear.

• Use the Slack desktop app or a supported browser. Background effects may be limited or unavailable in the mobile apps, so check your own app before you plan around them.
• Update Slack to the latest version. Older builds may not include background options.
• Grant camera permission to Slack. On macOS this is under System Settings > Privacy & Security > Camera. On Windows it is under Settings > Privacy & security > Camera. In a browser, allow camera access for Slack in the site permissions.
• Confirm the selected camera. If you have more than one camera or a virtual camera installed, make sure Slack uses the one you want in its audio and video preferences.
• Ask your workspace admin if huddles, video or custom images seem unavailable. Organizations can restrict these features.
• If you plan to use your own image, choose a landscape picture that roughly matches your camera's aspect ratio. Many webcams use 16:9. Check Slack's help documentation for the file formats and size limits it currently accepts. Use a fully opaque image, because transparent areas will not let your real room show through.

Privacy and file handling are worth verifying rather than assuming. The app does not show whether background processing runs entirely on your device, and an uploaded custom image may be stored with your account. If either point matters to you or your organization, check Slack's privacy and security documentation or ask your admin before you upload anything sensitive.

Step-by-step instructions

• 1. Open Slack and go to the channel or direct message where you want to talk.
• 2. Start or join a huddle with the huddle button in the conversation header.
• 3. Turn on your camera with the video button in the huddle controls.
• 4. Open the video options. Look for a settings or more-options menu in the huddle controls, often next to the camera button, and choose the entry for backgrounds or effects.
• 5. Choose an effect. Typical choices are no background, blur and a set of preset images. Your self-view updates so you can preview each option.
• 6. To use your own picture, choose the option to add or upload an image and select the file from your computer.
• 7. Close the menu. The selected background stays active for your current video.

The change is easy to undo. Open the same menu and choose the no-background option to return to your real camera view. If your version lists uploaded images, you can usually remove a custom image from that list too.

Some versions also offer a camera preview in Slack's preferences under audio and video. If yours does, use it to check your camera before you join a call.

Where you join from also matters. If a meeting runs through an integrated app such as Zoom or Microsoft Teams, set the background in that app, not in Slack. Some operating systems and webcam utilities offer their own effects, such as background blur. These are applied before Slack receives the video, so they appear in any app that uses the camera. Availability depends on your OS version and hardware.

Check the output

Watch your self-view for a few seconds. Turn your head, raise your hands and lean toward and away from the camera. Look at your hair, shoulders and fingers: these edges show most clearly whether the camera is separating you from the background.

Self-view is often mirrored, so text in a background image may look reversed to you while others see it correctly. The most reliable check is to ask another participant what they see, or to join the huddle from a second device.

Quality depends on more than the setting. Your camera's resolution and frame rate, your connection and Slack's video compression all affect how sharp the edges and background look. Slack may lower the video bitrate on a weak connection, which can make edges look soft or blocky. A custom image is scaled to fit the video frame. A small image or one with a very different aspect ratio may look blurry or cropped.

Common problems and next steps

• No background option in the huddle: update Slack and use the desktop app rather than mobile. If the option is still missing, ask your admin whether the feature is restricted. Background effects can also depend on your computer's processing capability.
• Camera is black or not detected: check camera permission in your operating system and browser. Close other apps that may be using the camera. Confirm the selected camera in Slack's audio and video settings.
• Edges flicker or parts of you disappear: improve your lighting so your face is evenly lit from the front. Sit a little farther from a busy or similarly colored wall. Avoid strong light behind you.
• Video lags after turning on an effect: background effects use extra processing power. Close demanding apps or switch from a custom image to blur, or turn the effect off.
• Two effects appear at once: an operating system effect, webcam utility or virtual camera may be stacking with Slack's background. Turn off one of them, or select your physical camera as the capture source in Slack.
• Custom image rejected or badly cropped: check the file format and size against Slack's current requirements. Then try a landscape image whose pixel dimensions match your camera's aspect ratio.

If a problem continues after these checks, look up the current huddle and video requirements in Slack's help center. If the problem affects only your workspace, contact your workspace admin.