# PptxGenJS Tutorial
## Setup & Basic Structure
```javascript
const pptxgen = require("pptxgenjs");
let pres = new pptxgen();
pres.layout = 'LAYOUT_16x9'; // or 'LAYOUT_16x10', 'LAYOUT_4x3', 'LAYOUT_WIDE'
pres.author = 'Your Name';
pres.title = 'Presentation Title';
let slide = pres.addSlide();
slide.addText("Hello World!", { x: 0.5, y: 0.5, fontSize: 36, color: "363636" });
pres.writeFile({ fileName: "Presentation.pptx" });
```
## Layout Dimensions
Slide dimensions (coordinates in inches):
- `LAYOUT_16x9`: 10" × 5.625" (default)
- `LAYOUT_16x10`: 10" × 6.25"
- `LAYOUT_4x3`: 10" × 7.5"
- `LAYOUT_WIDE`: 13.3" × 7.5"
---
## Text & Formatting
```javascript
// Basic text
slide.addText("Simple Text", {
x: 1, y: 1, w: 8, h: 2, fontSize: 24, fontFace: "Arial",
color: "363636", bold: true, align: "center", valign: "middle"
});
// Character spacing (use charSpacing, not letterSpacing which is silently ignored)
slide.addText("SPACED TEXT", { x: 1, y: 1, w: 8, h: 1, charSpacing: 6 });
// Rich text arrays
slide.addText([
{ text: "Bold ", options: { bold: true } },
{ text: "Italic ", options: { italic: true } }
], { x: 1, y: 3, w: 8, h: 1 });
// Multi-line text (requires breakLine: true)
slide.addText([
{ text: "Line 1", options: { breakLine: true } },
{ text: "Line 2", options: { breakLine: true } },
{ text: "Line 3" } // Last item doesn't need breakLine
], { x: 0.5, y: 0.5, w: 8, h: 2 });
// Text box margin (internal padding)
slide.addText("Title", {
x: 0.5, y: 0.3, w: 9, h: 0.6,
margin: 0 // Use 0 when aligning text with other elements like shapes or icons
});
```
**Tip:** Text boxes have internal margin by default. Set `margin: 0` when you need text to align precisely with shapes, lines, or icons at the same x-position.
---
## Lists & Bullets
```javascript
// ✅ CORRECT: Multiple bullets
slide.addText([
{ text: "First item", options: { bullet: true, breakLine: true } },
{ text: "Second item", options: { bullet: true, breakLine: true } },
{ text: "Third item", options: { bullet: true } }
], { x: 0.5, y: 0.5, w: 8, h: 3 });
// ❌ WRONG: Never use unicode bullets
slide.addText("• First item", { ... }); // Creates double bullets
// Sub-items and numbered lists
{ text: "Sub-item", options: { bullet: true, indentLevel: 1 } }
{ text: "First", options: { bullet: { type: "number" }, breakLine: true } }
```
---
## Shapes
```javascript
slide.addShape(pres.shapes.RECTANGLE, {
x: 0.5, y: 0.8, w: 1.5, h: 3.0,
fill: { color: "FF0000" }, line: { color: "000000", width: 2 }
});
slide.addShape(pres.shapes.OVAL, { x: 4, y: 1, w: 2, h: 2, fill: { color: "0000FF" } });
slide.addShape(pres.shapes.LINE, {
x: 1, y: 3, w: 5, h: 0, line: { color: "FF0000", width: 3, dashType: "dash" }
});
// With transparency
slide.addShape(pres.shapes.RECTANGLE, {
x: 1, y: 1, w: 3, h: 2,
fill: { color: "0088CC", transparency: 50 }
});
// Rounded rectangle (rectRadius only works with ROUNDED_RECTANGLE, not RECTANGLE)
// ⚠️ Don't pair with rectangular accent overlays — they won't cover rounded corners. Use RECTANGLE instead.
slide.addShape(pres.shapes.ROUNDED_RECTANGLE, {
x: 1, y: 1, w: 3, h: 2,
fill: { color: "FFFFFF" }, rectRadius: 0.1
});
// With shadow
slide.addShape(pres.shapes.RECTANGLE, {
x: 1, y: 1, w: 3, h: 2,
fill: { color: "FFFFFF" },
shadow: { type: "outer", color: "000000", blur: 6, offset: 2, angle: 135, opacity: 0.15 }
});
```
Shadow options:
| Property | Type | Range | Notes |
|----------|------|-------|-------|
| `type` | string | `"outer"`, `"inner"` | |
| `color` | string | 6-char hex (e.g. `"000000"`) | No `#` prefix, no 8-char hex — see Common Pitfalls |
| `blur` | number | 0-100 pt | |
| `offset` | number | 0-200 pt | **Must be non-negative** — negative values corrupt the file |
| `angle` | number | 0-359 degrees | Direction the shadow falls (135 = bottom-right, 270 = upward) |
| `opacity` | number | 0.0-1.0 | Use this for transparency, never encode in color string |
To cast a shadow upward (e.g. on a footer bar), use `angle: 270` with a positive offset — do **not** use a negative offset.
**Note**: Gradient fills are not natively supported. Use a gradient image as a background instead.
---
## Images
### Image Sources
```javascript
// From file path
slide.addImage({ path: "images/chart.png", x: 1, y: 1, w: 5, h: 3 });
// From URL
slide.addImage({ path: "https://example.com/image.jpg", x: 1, y: 1, w: 5, h: 3 });
// From base64 (faster, no file I/O)
slide.addImage({ data: "image/png;base64,iVBORw0KGgo...", x: 1, y: 1, w: 5, h: 3 });
```
### Image Options
```javascript
slide.addImage({
path: "image.png",
x: 1, y: 1, w: 5, h: 3,
rotate: 45, // 0-359 degrees
rounding: true, // Circular crop
transparency: 50, // 0-100
flipH: true, // Horizontal flip
flipV: false, // Vertical flip
altText: "Description", // Accessibility
hyperlink: { url: "https://example.com" }
});
```
### Image Sizing Modes
```javascript
// Contain - fit inside, preserve ratio
{ sizing: { type: 'contain', w: 4, h: 3 } }
// Cover - fill area, preserve ratio (may crop)
{ sizing: { type: 'cover', w: 4, h: 3 } }
// Crop - cut specific portion
{ sizing: { type: 'crop', x: 0.5, y: 0.5, w: 2, h: 2 } }
```
### Calculate Dimensions (preserve aspect ratio)
```javascript
const origWidth = 1978, origHeight = 923, maxHeight = 3.0;
const calcWidth = maxHeight * (origWidth / origHeight);
const centerX = (10 - calcWidth) / 2;
slide.addImage({ path: "image.png", x: centerX, y: 1.2, w: calcWidth, h: maxHeight });
```
### Supported Formats
- **Standard**: PNG, JPG, GIF (animated GIFs work in Microsoft 365)
- **SVG**: Works in modern PowerPoint/Microsoft 365
---
## Icons
Use react-icons to generate SVG icons, then rasterize to PNG for universal compatibility.
### Setup
```javascript
const React = require("react");
const ReactDOMServer = require("react-dom/server");
const sharp = require("sharp");
const { FaCheckCircle, FaChartLine } = require("react-icons/fa");
function renderIconSvg(IconComponent, color = "#000000", size = 256) {
return ReactDOMServer.renderToStaticMarkup(
React.createElement(IconComponent, { color, size: String(size) })
);
}
async function iconToBase64Png(IconComponent, color, size = 256) {
const svg = renderIconSvg(IconComponent, color, size);
const pngBuffer = await sharp(Buffer.from(svg)).png().toBuffer();
return "image/png;base64," + pngBuffer.toString("base64");
}
```
### Add Icon to Slide
```javascript
const iconData = await iconToBase64Png(FaCheckCircle, "#4472C4", 256);
slide.addImage({
data: iconData,
x: 1, y: 1, w: 0.5, h: 0.5 // Size in inches
});
```
**Note**: Use size 256 or higher for crisp icons. The size parameter controls the rasterization resolution, not the display size on the slide (which is set by `w` and `h` in inches).
### Icon Libraries
Install: `npm install -g react-icons react react-dom sharp`
Popular icon sets in react-icons:
- `react-icons/fa` - Font Awesome
- `react-icons/md` - Material Design
- `react-icons/hi` - Heroicons
- `react-icons/bi` - Bootstrap Icons
---
## Slide Backgrounds
```javascript
// Solid color
slide.background = { color: "F1F1F1" };
// Color with transparency
slide.background = { color: "FF3399", transparency: 50 };
// Image from URL
slide.background = { path: "https://example.com/bg.jpg" };
// Image from base64
slide.background = { data: "image/png;base64,iVBORw0KGgo..." };
```
---
## Tables
```javascript
slide.addTable([
["Header 1", "Header 2"],
["Cell 1", "Cell 2"]
], {
x: 1, y: 1, w: 8, h: 2,
border: { pt: 1, color: "999999" }, fill: { color: "F1F1F1" }
});
// Advanced with merged cells
let tableData = [
[{ text: "Header", options: { fill: { color: "6699CC" }, color: "FFFFFF", bold: true } }, "Cell"],
[{ text: "Merged", options: { colspan: 2 } }]
];
slide.addTable(tableData, { x: 1, y: 3.5, w: 8, colW: [4, 4] });
```
---
## Charts
```javascript
// Bar chart
slide.addChart(pres.charts.BAR, [{
name: "Sales", labels: ["Q1", "Q2", "Q3", "Q4"], values: [4500, 5500, 6200, 7100]
}], {
x: 0.5, y: 0.6, w: 6, h: 3, barDir: 'col',
showTitle: true, title: 'Quarterly Sales'
});
// Line chart
slide.addChart(pres.charts.LINE, [{
name: "Temp", labels: ["Jan", "Feb", "Mar"], values: [32, 35, 42]
}], { x: 0.5, y: 4, w: 6, h: 3, lineSize: 3, lineSmooth: true });
// Pie chart
slide.addChart(pres.charts.PIE, [{
name: "Share", labels: ["A", "B", "Other"], values: [35, 45, 20]
}], { x: 7, y: 1, w: 5, h: 4, showPercent: true });
```
### Better-Looking Charts
Default charts look dated. Apply these options for a modern, clean appearance:
```javascript
slide.addChart(pres.charts.BAR, chartData, {
x: 0.5, y: 1, w: 9, h: 4, barDir: "col",
// Custom colors (match your presentation palette)
chartColors: ["0D9488", "14B8A6", "5EEAD4"],
// Clean background
chartArea: { fill: { color: "FFFFFF" }, roundedCorners: true },
// Muted axis labels
catAxisLabelColor: "64748B",
valAxisLabelColor: "64748B",
// Subtle grid (value axis only)
valGridLine: { color: "E2E8F0", size: 0.5 },
catGridLine: { style: "none" },
// Data labels on bars
showValue: true,
dataLabelPosition: "outEnd",
dataLabelColor: "1E293B",
// Hide legend for single series
showLegend: false,
});
```
**Key styling options:**
- `chartColors: [...]` - hex colors for series/segments
- `chartArea: { fill, border, roundedCorners }` - chart background
- `catGridLine/valGridLine: { color, style, size }` - grid lines (`style: "none"` to hide)
- `lineSmooth: true` - curved lines (line charts)
- `legendPos: "r"` - legend position: "b", "t", "l", "r", "tr"
---
## Slide Masters
```javascript
pres.defineSlideMaster({
title: 'TITLE_SLIDE', background: { color: '283A5E' },
objects: [{
placeholder: { options: { name: 'title', type: 'title', x: 1, y: 2, w: 8, h: 2 } }
}]
});
let titleSlide = pres.addSlide({ masterName: "TITLE_SLIDE" });
titleSlide.addText("My Title", { placeholder: "title" });
```
---
## Common Pitfalls
⚠️ These issues cause file corruption, visual bugs, or broken output. Avoid them.
1. **NEVER use "#" with hex colors** - causes file corruption
```javascript
color: "FF0000" // ✅ CORRECT
color: "#FF0000" // ❌ WRONG
```
2. **NEVER encode opacity in hex color strings** - 8-char colors (e.g., `"00000020"`) corrupt the file. Use the `opacity` property instead.
```javascript
shadow: { type: "outer", blur: 6, offset: 2, color: "00000020" } // ❌ CORRUPTS FILE
shadow: { type: "outer", blur: 6, offset: 2, color: "000000", opacity: 0.12 } // ✅ CORRECT
```
3. **Use `bullet: true`** - NEVER unicode symbols like "•" (creates double bullets)
4. **Use `breakLine: true`** between array items or text runs together
5. **Avoid `lineSpacing` with bullets** - causes excessive gaps; use `paraSpaceAfter` instead
6. **Each presentation needs fresh instance** - don't reuse `pptxgen()` objects
7. **NEVER reuse option objects across calls** - PptxGenJS mutates objects in-place (e.g. converting shadow values to EMU). Sharing one object between multiple calls corrupts the second shape.
```javascript
const shadow = { type: "outer", blur: 6, offset: 2, color: "000000", opacity: 0.15 };
slide.addShape(pres.shapes.RECTANGLE, { shadow, ... }); // ❌ second call gets already-converted values
slide.addShape(pres.shapes.RECTANGLE, { shadow, ... });
const makeShadow = () => ({ type: "outer", blur: 6, offset: 2, color: "000000", opacity: 0.15 });
slide.addShape(pres.shapes.RECTANGLE, { shadow: makeShadow(), ... }); // ✅ fresh object each time
slide.addShape(pres.shapes.RECTANGLE, { shadow: makeShadow(), ... });
```
8. **Don't use `ROUNDED_RECTANGLE` with accent borders** - rectangular overlay bars won't cover rounded corners. Use `RECTANGLE` instead.
```javascript
// ❌ WRONG: Accent bar doesn't cover rounded corners
slide.addShape(pres.shapes.ROUNDED_RECTANGLE, { x: 1, y: 1, w: 3, h: 1.5, fill: { color: "FFFFFF" } });
slide.addShape(pres.shapes.RECTANGLE, { x: 1, y: 1, w: 0.08, h: 1.5, fill: { color: "0891B2" } });
// ✅ CORRECT: Use RECTANGLE for clean alignment
slide.addShape(pres.shapes.RECTANGLE, { x: 1, y: 1, w: 3, h: 1.5, fill: { color: "FFFFFF" } });
slide.addShape(pres.shapes.RECTANGLE, { x: 1, y: 1, w: 0.08, h: 1.5, fill: { color: "0891B2" } });
```
---
## Quick Reference
- **Shapes**: RECTANGLE, OVAL, LINE, ROUNDED_RECTANGLE
- **Charts**: BAR, LINE, PIE, DOUGHNUT, SCATTER, BUBBLE, RADAR
- **Layouts**: LAYOUT_16x9 (10"×5.625"), LAYOUT_16x10, LAYOUT_4x3, LAYOUT_WIDE
- **Alignment**: "left", "center", "right"
- **Chart data labels**: "outEnd", "inEnd", "center"