What size should a Slack profile picture be?

Use a square image at least 512×512 pixels; 1024×1024 is ideal. Slack crops non-square images, so a 1:1 ratio gives you the most control over how it looks.

What file formats does Slack accept for profile pictures?

Slack accepts JPG, PNG, GIF, and BMP profile photos, with a maximum file size of 1 MB.

How do I change my Slack profile picture?

Click your profile picture, choose Profile then Edit Profile, click Upload an Image, pick a square photo, crop it, and save. The change appears across the workspace right away.

Why is my Slack profile picture a colored square with initials?

That's Slack's default profile picture, shown when no photo has been uploaded. Uploading any image replaces it.

Slack Profile Pictures: The Complete Guide

Your Slack profile picture (also called your avatar, profile photo, or profile icon) is how teammates recognize you. Here's the right size and format, how to change it on any device, and how teams keep photos consistent.

Slack profile picture size and requirements

Slack shows your profile picture as a small, rounded square, so what matters most is using a clear, square image. Here are the specs:

Recommended size: Square, at least 512×512 px — 1024×1024 is ideal
Aspect ratio: 1:1 (Slack crops anything that isn't square)
Formats: JPG, PNG, GIF, or BMP
Max file size: 1 MB

Because the photo is displayed small, a tight head-and-shoulders crop reads far better than a full-body shot or a busy background.

Slack avatar, profile photo, or profile icon — the same thing

Slack has no single official name for it, so you'll see the image called a few different things. A Slack avatar, profile photo, profile icon, and profile picture all refer to the same square image shown next to your name in channels, threads, and direct messages. There's no separate "avatar" setting to hunt for — changing any of them means updating the one profile photo described on this page.

If you're looking for a Slack avatar to use, any square image works: a clear headshot, a company logo, or a simple illustration. Slack doesn't ship a gallery of avatars to choose from, so you upload your own. Until you do, Slack shows thedefault avatar — a colored square with your initials.

How to change your Slack profile picture

On desktop

Click your profile picture in the top-right corner.
Select Profile, then Edit Profile.
Click Upload an Image and choose your file.
Crop the image and click Save Changes.

On mobile (iOS & Android)

Tap You in the bottom-right corner.
Tap your profile picture, then Edit Profile.
Upload a photo from your gallery or take a new one.
Save your changes.

Need more detail or troubleshooting tips? See our full walkthrough onhow to change your Slack avatar.

The default Slack profile picture

If you haven't uploaded a photo, Slack shows a default profile picture — a colored square with your initials. You can't change its color; the only way to customize how you appear is to upload a real image. Learn more aboutthe Slack default profile picture.

Profile picture tips for teams

In bigger workspaces, real photos aren't just nicer to look at — they help people put a face to a name, reduce confusion in busy channels, and make the whole workspace feel more trustworthy. A few pointers:

Encourage a consistent style (clear, well-lit headshots).
Ask members to add a photo during onboarding, while it's top of mind.
Periodically check for members still on the default avatar.

Keeping every member's photo up to date by hand doesn't scale.Tidybot automatically spots people still using the default profile picture and reminds them to add a real one — seehow to require a profile picture in Slack.