Key Features
Platform
Electron Windows/macOS/Linux
Dynamic Dimensions
Calculate content width & height
Thermal Printers
58mm, 80mm receipt printers
Unit Conversion
Points, microns, mm, pixels
printToPDF()
Dynamic page size support
webContents.print()
Direct printing with microns
Unit Conversions
| Unit | Conversion Formula | Example (80mm) |
|---|---|---|
| Points | mm / 25.4 * 72 | 226.77 points |
| Microns | mm * 1000 | 80,000 microns |
| Inches | mm / 25.4 | 3.15 inches |
| Pixels | mm / 25.4 * DPI | 639px @ 203 DPI |
Quick Start
Measure Content Height
Inject this into webContents to get actual content height for print calculations:
JavaScript
// Measure content height in pixels from webContents
=====================================================
CONTENT HEIGHT MEASUREMENT
--------------------------
// Measure document content height in pixels
const contentHeightPx = await printWindow.webContents.executeJavaScript(`
Math.max(
document.body.scrollHeight,
document.body.offsetHeight,
document.documentElement.clientHeight,
document.documentElement.scrollHeight,
document.documentElement.offsetHeight
)
`);Paper Sizes Reference
| Paper Type | Width (mm) | Width (points) | Width (microns) |
|---|---|---|---|
| 58mm Thermal | 58 | 164.41 | 58,000 |
| 80mm Thermal | 80 | 226.77 | 80,000 |
| A4 | 210 | 595.28 | 210,000 |
| Letter | 216 | 612.00 | 216,000 |
What's Included
- Content height measurement script
- Content width measurement script
- Pixels to Points conversion
- Pixels to Microns conversion
- MM to Points/Microns conversion
- Complete height calculation with padding
- printToPDF() dynamic height example
- webContents.print() with microns example
- Full thermal receipt printing example
- Paper sizes & DPI reference tables
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