Slack Gif Creator

Creates animated GIFs that meet Slack's specific requirements for custom emoji and message animations. Gives you a GIFBuilder class, easing functions for smooth motion, and validators to check if your output will actually work in Slack before you upload it. The approach is flexible: you draw frames using PIL primitives (circles, polygons, gradients) and the skill handles optimization with color reduction and duplicate frame removal. Includes recipes for common animation patterns like bounce, pulse, and particle bursts. Honestly most useful for the Slack dimension constraints and the easing functions, since raw PIL animations tend to look pretty janky without interpolation.

skills.sh installs: 141
GitHub stars: 476
last updated: Aug 21, 2026

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Install

$ npx -y skills add aiskillstore/marketplace --skill slack-gif-creator --agent claude-code

Installs into .claude/skills of the current project.

Files

Slack GIF Creator

A toolkit providing utilities and knowledge for creating animated GIFs optimized for Slack.

Slack Requirements

Dimensions:

Emoji GIFs: 128x128 (recommended)
Message GIFs: 480x480

Parameters:

FPS: 10-30 (lower is smaller file size)
Colors: 48-128 (fewer = smaller file size)
Duration: Keep under 3 seconds for emoji GIFs

Core Workflow

from core.gif_builder import GIFBuilder
from PIL import Image, ImageDraw

# 1. Create builder
builder = GIFBuilder(width=128, height=128, fps=10)

# 2. Generate frames
for i in range(12):
    frame = Image.new('RGB', (128, 128), (240, 248, 255))
    draw = ImageDraw.Draw(frame)

    # Draw your animation using PIL primitives
    # (circles, polygons, lines, etc.)

    builder.add_frame(frame)

# 3. Save with optimization
builder.save('output.gif', num_colors=48, optimize_for_emoji=True)