PPTX Generator

When to Use This Skill

Use this skill when:

• Creating presentations programmatically from data or specifications
• Populating branded templates with dynamic content while preserving corporate styling
• Extracting text and structure from existing PPTX files for analysis
• Combining slides from a library of approved templates
• Automating presentation generation workflows

Do NOT use this skill when:

• User wants to open/view presentations (use native PowerPoint or viewer)
• Complex animations or transitions are required (limited support)
• Working with older .ppt format (PPTX only)

Prerequisites

• Deno installed (https://deno.land/)
• Input PPTX files for template-based operations
• JSON specification for scratch generation

Quick Start

Two Modes of Operation

1. Template Mode: Modify existing branded templates

   • Analyze & Replace: Find {{PLACEHOLDERS}} and replace with content
   • Slide Library: Select and combine slides from a template library

2. Scratch Mode: Create presentations from nothing using JSON specifications

Instructions

Mode 1: Template-Based Generation

Step 1a: Analyze the Template

Extract text inventory to understand what can be replaced:

deno run --allow-read scripts/analyze-template.ts corporate-template.pptx > inventory.json

Output (inventory.json):

{
  "filename": "corporate-template.pptx",
  "slideCount": 10,
  "textElements": [
    {
      "slideNumber": 1,
      "shapeId": "shape-2",
      "shapeName": "Title 1",
      "placeholderType": "ctrTitle",
      "position": { "x": 1.5, "y": 2.0, "w": 7.0, "h": 1.2 },
      "paragraphs": [
        { "text": "{{TITLE}}", "fontSize": 44, "bold": true }
      ]
    }
  ]
}

Step 1b: Create Replacement Specification

Create replacements.json:

{
  "textReplacements": [
    { "tag": "{{TITLE}}", "value": "Q4 2024 Results" },
    { "tag": "{{SUBTITLE}}", "value": "Financial Overview" },
    { "tag": "{{DATE}}", "value": "December 2024" },
    { "tag": "{{AUTHOR}}", "value": "Finance Team", "slideNumbers": [1] }
  ]
}

Step 1c: Generate Output

deno run --allow-read --allow-write scripts/generate-from-template.ts \
  corporate-template.pptx replacements.json output.pptx

Mode 1 (Alternative): Slide Library

Step 2a: Preview Template Slides

Get information about available slides:

deno run --allow-read scripts/generate-thumbnails.ts slide-library.pptx

For visual preview, extract the thumbnail:

deno run --allow-read --allow-write scripts/generate-thumbnails.ts \
  slide-library.pptx --extract-thumb --output-dir ./previews

Step 2b: Select and Combine Slides

Create selections.json:

{
  "slideSelections": [
    { "slideNumber": 1 },
    { "slideNumber": 5 },
    { "slideNumber": 12 },
    { "slideNumber": 3 }
  ],
  "textReplacements": [
    { "tag": "{{TITLE}}", "value": "Custom Presentation" }
  ]
}

Step 2c: Generate Combined Presentation

deno run --allow-read --allow-write scripts/generate-from-template.ts \
  slide-library.pptx selections.json custom-deck.pptx

Mode 2: From-Scratch Generation

Step 3a: Create Specification

Create spec.json:

{
  "title": "Product Launch 2025",
  "author": "Marketing Team",
  "slides": [
    {
      "background": { "color": "003366" },
      "elements": [
        {
          "type": "text",
          "x": 1, "y": 2.5, "w": 8, "h": 1.5,
          "options": {
            "text": "Product Launch 2025",
            "fontSize": 44,
            "bold": true,
            "color": "FFFFFF",
            "align": "center"
          }
        },
        {
          "type": "text",
          "x": 1, "y": 4, "w": 8, "h": 0.5,
          "options": {
            "text": "Revolutionizing the Industry",
            "fontSize": 24,
            "color": "CCCCCC",
            "align": "center"
          }
        }
      ]
    },
    {
      "elements": [
        {
          "type": "text",
          "x": 0.5, "y": 0.5, "w": 9, "h": 0.7,
          "options": {
            "text": "Key Features",
            "fontSize": 32,
            "bold": true,
            "color": "003366"
          }
        },
        {
          "type": "table",
          "x": 0.5, "y": 1.5, "w": 9, "h": 3,
          "options": {
            "rows": [
              ["Feature", "Description", "Benefit"],
              ["Speed", "2x faster processing", "Save time"],
              ["Quality", "HD output", "Better results"],
              ["Integration", "Works with existing tools", "Easy adoption"]
            ],
            "border": { "pt": 1, "color": "CCCCCC" }
          }
        }
      ]
    }
  ]
}

Step 3b: Generate Presentation

deno run --allow-read --allow-write scripts/generate-scratch.ts spec.json output.pptx

Examples

Example 1: Corporate Quarterly Report

Scenario: Generate quarterly report from branded template.

Steps:

# 1. Analyze template for replaceable content
deno run --allow-read scripts/analyze-template.ts quarterly-template.pptx --pretty

# 2. Create replacements.json with Q4 data
# 3. Generate report
deno run --allow-read --allow-write scripts/generate-from-template.ts \
  quarterly-template.pptx replacements.json Q4-2024-Report.pptx

Example 2: Custom Pitch Deck from Slide Library

Scenario: Combine approved slides for a specific client pitch.

Steps:

# 1. View available slides
deno run --allow-read scripts/generate-thumbnails.ts pitch-library.pptx

# 2. Create selections.json picking slides 1, 3, 7, 12, 15
# 3. Generate custom deck
deno run --allow-read --allow-write scripts/generate-from-template.ts \
  pitch-library.pptx selections.json acme-pitch.pptx

Example 3: Data-Driven Presentation

Scenario: Generate presentation from JSON data (e.g., API response).

Steps:

# 1. Transform your data into spec.json format
# 2. Generate presentation
deno run --allow-read --allow-write scripts/generate-scratch.ts data-spec.json report.pptx

Script Reference

Script	Purpose	Permissions
analyze-template.ts	Extract text inventory from PPTX	--allow-read
generate-thumbnails.ts	Get slide info and extract previews	--allow-read --allow-write
generate-from-template.ts	Modify templates (replace/combine)	--allow-read --allow-write
generate-scratch.ts	Create PPTX from JSON specification	--allow-read --allow-write

Element Types (Scratch Mode)

Type	Description	Key Options
text	Text box	text, fontSize, bold, color, align
image	Image from file or base64	path, data, sizing
table	Data table	rows, colW, border, fill
shape	Geometric shapes	type, fill, line, text
chart	Charts and graphs	type, data, title, showLegend

Common Issues and Solutions

Issue: Text not being replaced

Symptoms: Output PPTX still contains {{PLACEHOLDER}} tags.

Solution:

1. Run analyze-template.ts to verify exact tag text
2. Tags may be split across XML runs - ensure your template has tags in single text runs
3. Check slideNumbers filter in replacements

Issue: Slide order incorrect

Symptoms: Slides appear in wrong order after combining.

Solution:

• Slides are added in the order specified in slideSelections
• Verify slide numbers match original template (1-indexed)

Issue: Images not appearing

Symptoms: Image elements are blank in output.

Solution:

1. Use absolute paths or paths relative to spec.json location
2. Verify image file exists and is readable
3. Check supported formats: PNG, JPEG, GIF

Limitations

• No slide rendering: Cannot render slides to images directly (use LibreOffice for this)
• Limited animation support: Basic animations only in scratch mode
• No master slide editing: Template mode preserves but doesn't modify masters
• PPTX only: Does not support legacy .ppt format
• Text run splitting: Complex formatting in templates may split tags across XML elements

Related Skills

• pdf-generator: For creating PDF documents instead of presentations
• docx-generator: For creating Word documents
• xlsx-generator: For creating Excel spreadsheets