# Slack GIF Creator

Make animated GIFs that fit Slack's size and file limits.

- Repository: https://github.com/anthropics/skills (186321 stars)
- Category: Media
- License: Complete terms in LICENSE.txt
- Last updated: 2026-10-28
- Runs scripts: yes, review before use

## Install

Claude Code: `npx skills add anthropics/skills --skill slack-gif-creator -g -a claude-code -y`
Codex: `npx skills add anthropics/skills --skill slack-gif-creator -g -a codex -y`
Cursor: `npx skills add anthropics/skills --skill slack-gif-creator -g -a cursor -y`
Gemini CLI: `npx skills add anthropics/skills --skill slack-gif-creator -g -a gemini-cli -y`
Claude Code plugin marketplace: `/plugin marketplace add anthropics/skills`

## Description

Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# 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

```python
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)
```

## Drawing Graphics

### Working with User-Uploaded Images
If a user uploads an image, consider whether they want to:
- **Use it directly** (e.g., "animate this", "split this into frames")
- **Use it as inspiration** (e.g., "make something like this")

Load and work with images using PIL:
```python
from PIL import Image

uploaded = Image.open('file.png')
# Use directly, or just as reference for colors/style
```

### Drawing from Scratch
When drawing graphics from scratch, use PIL ImageDraw primitives:

```python
from PIL import ImageDraw

draw = ImageDraw.Draw(frame)

# Circles/ovals
draw.ellipse([x1, y1, x2, y2], fill=(r, g, b), outline=(r, g, b), width=3)

# Stars, triangles, any polygon
points = [(x1, y1), (x2, y2), (x3, y3), ...]
draw.polygon(points, fill=(r, g, b), outline=(r, g, b), width=3)

# Lines
draw.line([(x1, y1), (x2, y2)], fill=(r, g, b), width=5)

# Rectangles
draw.rectangle([x1, y1, x2, y2], fill=(r, g, b), outline=(r, g, b), width=3)
```

**Don't use:** Emoji fonts (unreliable across platforms) or assume pre-packaged graphics exist in this skill.

The rest: https://github.com/anthropics/skills/blob/HEAD/skills/slack-gif-creator/SKILL.md