Scale images proportionally · calculate print dimensions · convert pixels to inches
Enter original dimensions, then change width or height — the other adjusts automatically to keep the ratio.
Enter image pixel dimensions and target DPI to get print size, or enter print size to get required pixels.
Calculate the pixel density (PPI) of any screen or image by entering its resolution and physical size.
| Use case | Recommended DPI | Example: 4×6" print |
|---|---|---|
| Web / screen display | 72–96 DPI | 288×432 px minimum |
| Large format / banners | 72–150 DPI | 300×450 px (viewed from 3ft+) |
| Newspaper | 150–200 DPI | 600×900 px minimum |
| Brochures / flyers | 200–300 DPI | 1200×1800 px minimum |
| Photo prints ★ | 300 DPI | 1200×1800 px |
| Fine art / archival | 600 DPI | 2400×3600 px |
Enter the original dimensions, then change either width or height with ratio locked on. The other dimension calculates automatically. Scale factor = new / original.
At 300 DPI: 4×300 = 1200px wide, 6×300 = 1800px tall. So you need at least 1200×1800 pixels for a sharp 4×6 print at 300 DPI.
PPI (pixels per inch) is a digital image property. DPI (dots per inch) is a printer property. In everyday use they're treated as equivalent when specifying image resolution for print.
Enlarging a raster image always reduces apparent sharpness — you're stretching existing pixels. AI upscaling tools (Topaz, Adobe Firefly) can add detail. As a rule: don't upscale more than 2× for print.