Custom emoji for your Slack workspace
Create unique emoji and icons that capture your team's culture. Make Slack fun and on-brand.
Example icons generated with Pixelle
Sound familiar?
The old way
- ✗Default Slack emoji are boring
- ✗Your team has inside jokes that need emoji
- ✗Want to add brand personality to Slack
With Pixelle
- Team culture in emoji form
Inside jokes, team mascots, reaction favorites - turn your culture into emoji.
- Brand your workspace
Custom icons make your Slack feel like yours. Reinforce brand identity in every message.
- Better reactions
Standard emoji are boring. Custom reactions make communication fun and expressive.
Simple Process
How to Use the Custom emoji for your Slack workspace
Decide your emoji theme
Inside jokes, team identity, replacement reactions, project markers. The theme determines whether your custom emoji feel cohesive or random.
Generate square PNGs at 128x128
Slack displays emoji at small sizes. Generate at 128px so they render crisply in messages, reactions, and the picker without looking blurry.
Upload via Slack's emoji settings
Workspace name > Customize Slack > Add Custom Emoji. Drop in your PNG, give it a name like :rocket-launch:, and it's available to your whole team.
That's it. From idea to icon in under a minute.
Example Prompts for Custom emoji for your Slack workspace
Copy these prompts or use them as inspiration for your own icons
Ship It
“A 3D rocket emoji launching with flame trail, team celebration style, vibrant orange and blue, emoji size, transparent background”
LGTM
“A 3D thumbs up emoji with sparkles, approval reaction, bright green, friendly style, transparent background”
Parrot Party
“A 3D party parrot style bird emoji, colorful dancing bird, celebration mood, transparent background”
Coffee Time
“A 3D coffee mug emoji with steam heart, cozy break time, warm brown tones, transparent background”
Mind Blown
“A 3D exploding head emoji, mind blown reaction, colorful explosion effect, transparent background”
Building a custom Slack emoji set
Slack's custom emoji are one of the few design surfaces every team member uses daily. A coherent set is small but high-impact for team culture.
- 1
Generate at exactly 128x128 PNG
Slack accepts up to 128px and downsizes the rest. Generating at the target size avoids compression artifacts and keeps the file under Slack's 64KB limit.
- 2
Use transparent backgrounds always
Slack's emoji picker has both light and dark modes, plus user-customized themes. Non-transparent backgrounds will look like square stamps against any theme but the one you designed for.
- 3
Test against Slack's tiny display sizes
Emoji appear as 22px in messages and 64px in reactions. If your icon has fine detail it'll mush at those sizes. Simplify until the icon reads at thumbnail size.
- 4
Upload through Slack's UI
Workspace name > Customize Slack > Add Custom Emoji. Drag your PNG, type the name (no spaces, no colons), Save. Available immediately to everyone.
- 5
Name with consistent conventions
Use prefixes like :team-rocket:, :team-fire:, :team-celebrate:. The prefix makes your custom set easy to find in the picker and signals which emoji are team-made vs. defaults.
- 6
Rotate seasonally
Generate themed sets for launches, holidays, or company events. Custom emoji are one of the easiest ways to mark a moment in your team's culture.
Why Slack emoji are worth designing on purpose
Custom Slack emoji started as a joke and ended up as one of the most-used surfaces in modern teamwork. A reaction emoji on a message conveys agreement, acknowledgment, or tone faster than a written reply. Custom emoji extend that vocabulary to whatever language your team needs - inside jokes, project markers, mood signals, status indicators.
Most teams accumulate custom emoji haphazardly - someone uploads a screenshot, someone else uploads a meme. The result is a picker full of one-off emoji that no one quite remembers the meaning of. A custom emoji set designed deliberately - cohesive style, clear themes, shared vocabulary - becomes part of how the team communicates.
Engineering teams that take this seriously build hundreds of custom emoji that operate as a shared visual language. New employees learn the emoji vocabulary as part of onboarding. Reactions stop being decorative and start being functional.
Pixelle makes it easy to generate a cohesive emoji set in your team's voice. You can match your brand aesthetic, reference your products, or build a themed pack for a specific channel or project. Upload once, and your team has a new shared vocabulary for the next thousand conversations.
Related AI Icon Generators
More tools for the same kind of work
Built for
Team leads, workspace admins, remote teams, and company culture builders
FAQ
Custom emoji for your Slack workspace FAQ
What size do Slack emoji need to be?
Slack emoji display at 128x128 pixels. Pixelle generates high-res icons that look great when scaled down to emoji size.
How do I add custom emoji to Slack?
Go to your Slack workspace, click on the emoji picker, then 'Add Emoji'. Upload your Pixelle icon and give it a name like :ship-it:
Can I create animated Slack emoji?
Pixelle generates static images. For animated emoji, you'd need to animate the PNG separately, though static emoji work great for most reactions.
Ready to create your icons?
Join thousands of creators using Pixelle to build beautiful products.
Free to start · No credit card required