DPI 与打印尺寸计算器
计算打印尺寸和 DPI
在浏览器中运行 · 无需上传
此工具及本页说明目前仍为英文。功能完全相同：一切都在你的浏览器中运行。
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300 DPI is the usual print-shop standard. To print larger at the same sharpness you need more pixels: changing the DPI number alone doesn't add detail. Related: Change Image DPI, Image Resizer.
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How to use it
- Pick what you want to find: print size, pixels needed, or DPI.
- Enter the numbers, or read the size from an image.
- Read the result and the quality hint.
Rules of thumb
| DPI | Quality |
|---|---|
| 300 | Sharp prints you look at up close (photos, flyers) |
| 200–240 | Good for most prints |
| 150 | Posters seen from a step away |
| 72–100 | Screens only; prints look soft |
Good to know
- DPI only matters for printing. On screens, only the pixel size counts.
- A4 at 300 DPI needs 2480 × 3508 pixels.
- To change the DPI value stored in a file without changing the pixels, use the Change DPI tool.
Calculated in your browser
The calculations run in your browser as you type. Nothing you enter is sent anywhere.
常见问题
How many pixels do I need for an A4 print?
2480 × 3508 at 300 DPI, or 1754 × 2480 at 212 DPI for a decent result.
Does changing DPI make my picture sharper?
No. Only more pixels do. The DPI value just tells printers how big to print.