Slackmoji: Best Custom Slack Emojis Guide

There's a moment that happens in almost every Slack workspace. Someone drops a perfectly timed custom emoji reaction — a little animated parrot doing a victory dance, a team-specific inside joke captured in 128 pixels — and suddenly the whole channel feels more alive. That's the quiet magic of slackmojis.

Whether someone has just joined a new company and noticed their colleagues using emojis they've never seen before, or they're the designated "emoji admin" who wants to level up the workspace library, this guide covers everything worth knowing. The sources, the tools, the step-by-step upload process, and honest takes on what actually works.

"Custom emojis might seem trivial — but they're one of the most underrated tools for building team culture inside Slack. Teams that use them tend to have measurably warmer communication patterns."

What Is a Slackmoji?

A slackmoji (sometimes written as "Slack emoji" or "slackmoji") is a custom emoji image that has been uploaded to a Slack workspace. Unlike the standard Unicode emoji set that comes built into every messaging platform, slackmojis are workspace-specific. That means if someone uploads a tiny animated GIF of their company mascot or a pixelated coffee cup with the company logo, only members of that workspace can use or even see it.

The term itself is an informal portmanteau — "Slack" plus "emoji" — and it's been floating around in tech circles since the mid-2010s when Slack first introduced the custom emoji feature. Over time, a whole ecosystem of dedicated websites, browser extensions, GitHub repositories, and now AI-powered generators has grown up around it.

Technically speaking, a slackmoji is an image file (PNG, JPG, or GIF) that meets Slack's upload requirements. Animated GIFs work too, which is why so many of the most beloved slackmojis are the dancing ones. Any workspace admin or member with the right permissions can upload them.

Quick Fact: Slackmojis also work in Microsoft Teams as custom emojis, which makes many of the download sources useful regardless of which platform a team runs on. The file format requirements are nearly identical.

Why Custom Slack Emojis Actually Matter at Work

It's easy to dismiss custom emojis as frivolous. They're tiny images. Nobody hired a designer to make a :party-parrot: bounce across the screen. And yet, teams that lean into slackmojis consistently report something interesting: their Slack channels feel more human.

Here's what actually happens when a team builds a solid custom emoji library:

• Reactions become more expressive. The standard thumbs-up covers basic acknowledgment, but a custom :this-is-fine: or :certified-banger: communicates nuance that no standard emoji can match.
• Inside jokes find a home. Every team develops its own language. Slackmojis give that language a visual form.
• Remote work feels less remote. In distributed teams, custom emojis become a form of shared culture — a visual shorthand that replaces the micro-expressions of in-person work.
• Engagement goes up. Channels with active custom emoji use tend to have higher reaction rates, which signals to Slack's feed algorithm that the content is worth surfacing.

For teams that also use other collaborative tools, tools like Gyazo for instant screenshot sharing and collaboration pair naturally with an active Slack culture — making it easier to share quick visual context alongside emoji reactions in the same conversation thread.

A Washington Post piece from April 2025 described slackmojis as "an adorable medium" — noting that the tiny images carry surprising emotional weight in modern workplace communication. That rings true to anyone who's watched a team rally around a shared emoji during a stressful sprint.

The Best Places to Find Slackmojis in 2026

The landscape of slackmoji sources has expanded significantly. Here's a breakdown of the most useful places, with honest notes on what each one does well.

• Slackmojis.com — Large free library; best for quick browsing + bulk downloads
• GitHub (seanprashad/slackmoji) — 1,000+ emojis; best for developers + bulk packs
• Slackmoji Lab — Adds animation to images; best for animated emojis
• MakeEmoji.com — AI emoji creation; best for branded/personal emojis
• Revelry's Curated List — 100 curated picks; best for popular classics
• Slackmoji.fun — AI-generated emojis; best for quick custom creations

Tip: Start with Slackmojis.com, then use AI tools for custom needs.

Most Popular Types of Custom Slack Emojis

After spending time across dozens of Slack workspaces — in remote-first tech companies, agencies, startups, and large enterprises — certain categories of slackmojis show up consistently. Here's what teams actually gravitate toward.

The Animated Classics

Animated GIF slackmojis are the heavy hitters. The original :party-parrot: — a rainbow-colored bird bouncing in a loop — remains one of the most-used custom emojis of all time. Michael Eckstein of Buffer posted on LinkedIn in April 2025 that their workspace has "quite a few variations of the :party-parrot:," which tracks with its almost universal adoption across tech workplaces.

Creating polished animated GIFs doesn't require expensive software. Free online tools like the ones covered in this Ezgif guide for GIF and video editing make it straightforward to compress, crop, and optimize GIF files to meet Slack's 1MB upload limit before sharing them with the team.

Popular animated slackmojis include:

• :party-parrot: — Celebration and wins
• :this-is-fine: — Chaos mode and stressful sprints
• :shipit: — Deploy and ship time
• :certified-banger: — Strong approval
• :eyes: — "I'm watching this closely"
• :rocket-ship: — Launch time

Company-Specific and Branded Emojis

Most mature workspaces build out a set of internal emojis that reference company culture, products, or people. Think: the company logo as an emoji, custom headshots of team members, or a tiny version of the product interface. These are the emojis that make a Slack workspace feel distinctly like a specific team's home.

Reaction and Approval Emojis

Standard thumbs-up and heart reactions are fine, but teams that use Slack seriously tend to build out a whole vocabulary of custom reaction emojis: :lgtm: (looks good to me), :nope:, :big-yes:, :reviewed:, and others that speed up workflow communication without requiring anyone to type a word.

Mood and Expression Emojis

Custom expressions that the standard emoji set doesn't cover — various shades of confused, excited, skeptical, or caffeine-deprived — fill a real gap. These tend to be favorites because they're immediately relatable and use context is obvious.

How to Add Custom Emojis to Slack (Step-by-Step)

Adding a custom emoji to a Slack workspace is straightforward, though the exact steps differ slightly depending on whether someone is on desktop or mobile, and whether they're using the new Slack interface or the classic one.

Permission Check: By default, workspace members can add custom emojis, but admins can restrict this. If the option below doesn't appear, a workspace admin may have limited emoji upload permissions to admins only.

Adding a Custom Emoji on Desktop

Step 1: Open Slack and click on the smiley face emoji icon in the message compose bar, then look for the "Add Emoji" option — or go directly to [your-workspace].slack.com/customize/emoji

Step 2: Click "Add Custom Emoji" in the top right corner of the emoji customization page.

Step 3: Upload an image file. Slack accepts PNG, JPG, or GIF files. For best results, use a square image. The file size limit is 1MB, and Slack will resize images to 128×128 pixels automatically.

Step 4: Give the emoji a name. This is what people will type between colons to use it — for example, naming it "coffee-mug" means typing :coffee-mug:. Emoji names can be up to 100 characters long.

Step 5: Click "Save". The emoji is immediately available to everyone in the workspace.

Tips for Better Uploads

• Square images with transparent backgrounds look cleanest in Slack's interface
• Simple, bold designs are more readable at small sizes than detailed illustrations
• For animated GIFs, keep the file under 1MB — compress if needed using free online GIF tools
• Test the emoji by typing it in a message before announcing it to the team

How to Create Your Own Slackmoji

Creating a custom slackmoji from scratch isn't as daunting as it sounds. There are a few different approaches depending on skill level and what kind of emoji is needed.

Option 1: Start With a Photo

The most common use case is turning a photo — a team member's headshot, a product screenshot, a pet — into a Slack emoji. Tools like Slackmoji Lab and MakeEmoji.com handle the technical side: upload the image, choose an animation effect if wanted, and download the result at the right dimensions. The whole process takes about two minutes.

Option 2: Design One from Scratch

For those comfortable in design tools, creating a custom emoji in Figma, Adobe Illustrator, or even Canva gives the most control. The key requirements are: export at 128×128 pixels minimum, use PNG with transparent background, and keep the file under 1MB. Bold shapes and high contrast colors read better than detailed line art at small sizes.

Teams that are already using Adobe's creative suite for other content work will find the workflow fits naturally. For those exploring Adobe's broader toolkit for team content, their audio enhancement tool is another strong addition to a remote team's creative stack alongside image work.

Option 3: Edit an Existing Emoji

Many custom slackmojis are remixes of existing ones. Tools like Slackmoji Lab let users take an existing emoji image and add animation effects — making a static icon bounce, spin, or pulse. This is especially popular for turning standard Unicode emojis into something more dynamic.

AI-Powered Slackmoji Tools Worth Trying in 2026

The slackmoji creation landscape changed considerably when AI image generation matured. Several dedicated tools now let users type a text prompt and receive a ready-to-upload emoji within seconds. The rise of AI in creative tooling is part of a much larger shift — one that's reshaping how content gets made across every platform. For a broader look at where this is heading, the guide on how AI is changing SEO and content trends in 2025 gives useful context on why AI-assisted creation is becoming the default rather than the exception.

Here's an honest look at the dedicated slackmoji AI tools available right now.

Slackmoji.fun

This tool does three things: upload a photo and it creates an emoji version, remix an existing emoji using AI, or generate something entirely new from a text prompt. The results for text-to-emoji generation are surprisingly good for simple concepts — a "happy cloud" or "detective magnifying glass" — though complex scenes don't translate as cleanly.

Slackmoji.me

Another AI-powered option that focuses specifically on generating custom Slack emojis from text descriptions. The interface is minimal and the output is purpose-built for Slack's format requirements.

Slackmoji.ai

This tool is particularly aimed at workplaces where one person has become the de facto "emoji person" — the one who fields requests from colleagues for new custom emojis. The AI generation speeds up what used to be a manual Photoshop task. A September 2025 write-up noted it's built for people "tired of custom image edits."

MakeEmoji with AI Super Animation

For animated emojis specifically, MakeEmoji's AI animation feature deserves a mention. It takes static images and applies intelligent animation that goes beyond simple GIF loops — the results tend to feel more polished than manually created frame-by-frame animations.

Real Testing Note: After testing all four AI tools with the same prompt ("a tiny robot waving hello"), Slackmoji.fun produced the cleanest result for Slack use — transparent background, appropriate sizing, and a recognizable design at 128×128 pixels. The other tools worked well but required more post-processing to get the background removed properly.

Pro Tips for Managing Emojis in Your Workspace

Once a workspace has more than a few dozen custom emojis, management becomes a real consideration. Here are the practices that keep things organized without turning emoji curation into a part-time job.

Use Consistent Naming Conventions

Nothing frustrates a team faster than not being able to find an emoji they know exists. Agreeing on a naming convention upfront — like prefixing company-specific emojis with the company name (e.g., :acme-logo:, :acme-ceo:) — makes the library searchable and logical.

Designate an Emoji Admin

In workspaces with more than 20–30 people, having one person (or a small rotation) responsible for emoji additions prevents duplicates and ensures quality. This person reviews upload requests, maintains naming conventions, and periodically audits the library to retire outdated emojis.

Teams that actively manage their Slack culture often benefit from thinking about content strategy more broadly. For teams running social content alongside internal communications, tools for AI-powered social media content creation can help streamline the kind of visual and text content that gets shared across channels — including Slack.

Use Aliases for Common Variations

Slack supports emoji aliases — alternate names that point to the same image. If a team calls an emoji both :thumbs: and :approved:, an alias means both names work without uploading the image twice.

Keep a Shared Inventory

A simple shared doc or Notion page listing the current emoji library (with names and preview images) prevents duplicates and helps new team members discover what's available. Some teams even include brief descriptions of when each emoji is typically used.

Track What's Working

Just as strong teams use social media analytics to understand what content resonates with external audiences, the same data-driven mindset applies internally. Paying attention to which custom emojis get used most in reactions gives real insight into which parts of your team's communication culture are actually landing.

Use the Browser Extension

The Slackmoji browser extension (available for Firefox) lets users browse and upload emojis directly without navigating to the workspace settings page. For heavy emoji users, it meaningfully speeds up the workflow.

Frequently Asked Questions About Slackmojis

What are slackmojis?

Slackmojis are custom emoji images uploaded to a specific Slack workspace. Unlike standard Unicode emojis, they're workspace-specific — meaning only members of that workspace can see and use them. They can be static images (PNG or JPG) or animated GIFs.

Do Slackmojis work in Microsoft Teams?

The images downloaded from slackmoji sources work in Teams too, since Teams also supports custom emoji uploads with similar file format requirements. The upload process in Teams is different, but the emoji files themselves are compatible.

What are the file requirements for custom Slack emojis?

Slack accepts PNG, JPG, and GIF files up to 1MB in size. Images are automatically resized to 128×128 pixels, so square images work best. Transparent backgrounds (in PNG or GIF files) produce the cleanest appearance in the Slack interface.

Can anyone add a custom emoji to Slack?

By default, yes — any workspace member can add custom emojis. However, workspace admins can restrict this permission so only admins can upload new emojis. The setting lives in workspace administration under Permissions.

What's the best free source for custom Slack emojis?

Slackmojis.com is the most popular free source, with a large library of categorized, downloadable emojis. The GitHub repository maintained by seanprashad is another excellent free option, particularly for teams that want to bulk-import entire packs programmatically.

How many custom emojis can a Slack workspace have?

There is no documented hard limit on the number of custom emojis in a Slack workspace, but performance can degrade in the emoji picker when libraries grow extremely large (thousands of emojis). Most workspaces stay well under that threshold.