How do I make a custom Slack emoji?

Describe it in the Slack emoji maker, generate it, and press the "Slack 128 px" download. Then open the emoji picker in Slack, choose Add Emoji, upload the file, name it and press Save.

What size is a Slack emoji?

Slack recommends a square image of 128 x 128 pixels, under 128 KB, in JPG, PNG or GIF. GIFs can have up to 50 frames. The "Slack 128 px" download resizes your emoji to that size.

Can I make a Slack emoji GIF that moves?

Yes. This Slack emoji GIF is a looping animation of 8, 12 or 16 frames with a transparent background. Eight frames is the best choice for Slack because it keeps the file small.

Is this a Slack emoji generator or a resizer?

It is a generator. It draws a new animated emoji from your words. It does not resize or remove the background from an image you upload, although the 128 px download resizes your own result.

Why was my animated Slack emoji rejected?

The usual reasons are a file over 128 KB, a non-square image, or a workspace setting that limits who can add emoji. Regenerate with 8 frames and a simpler style, then use the 128 px download.

How much does the Slack emoji maker cost?

A Standard emoji costs 1 credit and an HD emoji 2, from $0.07 per Standard emoji in the larger packs to about $0.12 in the Starter pack. Credits never expire and there is no subscription.

Is this an official Slack tool?

No. This Slack emoji maker is part of GIF Generator AI, an independent website. It is not made by, endorsed by or affiliated with Slack.

Animated, transparent, 128 px ready

Slack Emoji Maker

This Slack emoji maker draws a new animated custom emoji from a sentence and saves it at the size Slack asks for. The emoji is a transparent GIF that loops, so it sits cleanly on a light or dark theme. Describe it, press Generate, download the 128 px file and add it to your workspace.

Make my Slack emoji

SLACK

1Describe your emoji

One subject and one action that repeats (waving, bouncing, blinking) loop best. Words go in quotes. No real people, celebrities or brand characters.

2Pick a style

3Format and quality

Size320 px square; a 128 px download after

Background

Frames

Speed

Seamless loop (the last frame flows into the first)

1 credit, about 8-15 seconds. Failed generations are refunded. Pricing · Terms

Your emoji GIF appears here. The checkerboard shows the see-through parts.

What's new

2026-11-05Launch: a "Slack 128 px" download that resizes your emoji to 128 x 128 in the browser.

How to use the Slack Emoji Maker

Describe your emoji
One object or face and one motion: "a smiling coffee mug bounces". Add a word in quotes if you need text.
Generate it
The emoji is a transparent 320 x 320 GIF. Standard takes about 8 to 15 seconds and costs 1 credit.
Download "Slack 128 px"
The button resizes the GIF to 128 x 128 in your browser. Upload it in Slack and name it.

Start with step 1

Made with this tool

Made with this generator and GPT-Image-2.6 from the prompts and styles shown, with no editing afterwards. The checkerboard shows where the background is transparent. The people, pets and input photo are AI-generated and fictional.

Emoji GIF example: LGTM rubber duck — LGTM rubber duck“a yellow rubber duck that nods slowly, with bold white letters below it reading "LGTM"”Standard · Cartoon · 320 px · 8 frames · 158 KB · transparentMake one like this Original file

Emoji GIF example: Ship it rocket — Ship it rocket“a small red and white rocket that blasts upward and drops back into place, with bold letters reading "SHIP IT"”Standard · Cartoon · 320 px · 8 frames · 136 KB · transparentMake one like this Original file

Emoji GIF example: Coffee first — Coffee first“a steaming coffee mug with a sleepy face that takes a big sip and perks up”Standard · Kawaii · 320 px · 8 frames · 192 KB · transparentMake one like this Original file

GIF example: It's Friday chair spin — It's Friday chair spin“A fictional office worker in a beige cardigan leans back in a rolling office chair and spins slowly with arms spread wide and eyes closed in pure joy, with a bold white Impact caption at the bottom reading "IT'S FRIDAY"”Standard · Realistic · 720 px · 12 frames · 2.6 MBMake one like this Original file

Sticker GIF example: Vibing cockatoo — Vibing cockatoo“A white cockatoo head-bangs to music with its yellow crest flapping, with a bold white Impact caption at the bottom reading "VIBING"”Standard · Realistic · 320 px · 12 frames · 348 KB · transparentMake one like this Original file

GIF example: Gamer hamster GG — Gamer hamster GG“A hamster in a tiny gaming headset smashes a mini keyboard with both paws, then throws its paws up in victory, with a bold white Impact caption at the bottom reading "GG"”Standard · Realistic · 720 px · 12 frames · 1.9 MBMake one like this Original file

Sticker GIF example: Corgi photo to sticker — Corgi photo to stickerNo prompt: photo onlyStandard · Kawaii · 320 px · 8 frames · 266 KB · transparentMake one like this Original file

Input photo for Corgi photo to sticker — Corgi photo to stickerNo prompt: photo onlyStandard · Kawaii · 320 px · 8 frames · 266 KB · transparentMake one like this Original file

Emoji GIF example: Winking pizza — Winking pizza“a slice of pepperoni pizza with a happy face that winks and gives a thumbs up”Standard · Cartoon · 320 px · 8 frames · 187 KB · transparentMake one like this Original file

What this Slack emoji maker produces

You get a looping GIF of one subject with a transparent background. The Slack emoji maker draws it at 320 x 320 pixels, and the "Slack 128 px" button saves a 128 x 128 copy resized in your browser. An 8-frame emoji is usually well under Slack’s 128 KB limit once it is resized, and the generator shows the exact size.

A custom Slack emoji is shown at text size, so a bold shape beats detail. Ask for thick outlines, flat colors and a single subject.

Slack emoji size and file limits

According to the Slack Help Center, a custom emoji should be a square image under 128 KB, 128 x 128 pixels, with a transparent background working best. File types are JPG, PNG or GIF, and GIFs can have up to 50 frames. Slack tries to resize an image that is too large, but it can still reject it.

This Slack emoji maker makes 8, 12 or 16 frames, so it stays inside the frame limit. If a file is refused for size, regenerate with 8 frames and a simpler prompt.

How to add a custom emoji in Slack

Make the emoji in the Slack emoji maker first. Then, on desktop, open the emoji picker with the smiley icon in a message field and choose Add Emoji. You can also open your workspace menu, go to Customize, and add it from the Emoji tab. Upload the 128 px GIF, give the emoji a short name (members type it between colons), and press Save.

Menu names shift between Slack versions. Workspace admins can limit who is allowed to add custom emoji, so if you do not see the option, ask an admin.

Slack emoji GIF and animated Slack emoji tips

A slack emoji gif works best with one repeating action: a nod, a wobble, a wave. Eight frames at Normal speed loop in about one second, which feels lively without being distracting in a busy channel.

For an animated Slack emoji that reads on both light and dark themes, avoid white outlines and pick mid-tone colors. Because GIF transparency is on or off per pixel, soft shadows can look rough, so ask for a flat style with no glow.

A Slack emoji generator for team in-jokes

Teams use custom emoji for status, kudos and running jokes: a rocket for a deploy, a mug for a stand-up, a sleepy bug for a bug that will not die. As a Slack emoji generator it lets you make the ones that exist nowhere else.

For a matching set, keep the same style words in each prompt. Describe an original character such as "a smiling cardboard box" rather than a brand mascot.

Want a full scene instead? The GIF generator makes 720 px looping GIFs of any idea. For a different format, try the Twitch emote maker or the transparent GIF maker or the AI sticker generator. Credits for every format are on the pricing page, failed generations are refunded under the refund policy, and questions about uploads go to our contact page. Before you upload, check the Discord emoji size guide, or see how other tools compare in the best AI sticker generators.

More GIF tools

GIF generator

Any idea as a looping 720 px GIF, or a transparent 320 px sticker GIF.

AI sticker generator

Animated or still stickers with a transparent background and a white die-cut edge.

Discord GIF maker

Animated emoji, stickers, reaction GIFs and avatars, sized for Discord’s limits.

Image to GIF AI

Animate your own photo as a looping GIF, or cut its subject out as a transparent sticker.

AI emoji generator

Animated custom emoji with a transparent background, made from one sentence.

Twitch emote maker

Animated Twitch emotes from a prompt, with downloads at 112, 56 and 28 px.

Transparent GIF maker

New animated GIFs with a transparent background from the first frame, no cut-out halo.

Original art only

GIF Generator AI draws new images from your words with OpenAI's GPT-Image-2.6. Prompts for sexual content, celebrities, minors, or other people's characters and logos are refused, and a photo you upload may show only you or people who agreed. Every prompt is checked before credits are charged, OpenAI applies its own safety filters, and a blocked generation is refunded. GIF Generator AI is an independent site, not affiliated with OpenAI or Discord.