📐 PPI / 像素密度计算Pixels Per Inch (PPI) Calculator

使用说明与常见问题How-to & FAQ

「PPI / 像素密度计算」是什么？What is the Pixels Per Inch (PPI) Calculator tool?

PPI = 像素 ÷ 英寸；也可由像素与 PPI 反推印刷尺寸。可设置「计算」、「像素（边长）」、「英寸（边长）」、「PPI」。PPI = pixels ÷ inches; or print size from pixels and PPI. Settings: Calculate, Pixels (edge), Inches (edge), PPI.

如何使用「PPI / 像素密度计算」？How do I use the Pixels Per Inch (PPI) Calculator tool?

在「PPI / 像素密度计算」中，填写「计算」、「像素（边长）」、「英寸（边长）」、「PPI」等参数，结果会随输入实时计算并显示在下方。In the Pixels Per Inch (PPI) Calculator: Fill in "Calculate", "Pixels (edge)", "Inches (edge)", "PPI"; results are recalculated instantly as you type.

PPI vs DPIPPI vs DPI

PPI 描述像素密度；打印机 DPI 是墨点密度，相关但不同。PPI is pixel density; printer DPI is ink-dot density - related but not the same.

能举个计算实例吗？Can you show a worked example?

例如在「PPI / 像素密度计算」中填 计算 = 由尺寸算 PPI，像素（边长） = 1920，英寸（边长） = 13.3，PPI = 300，结果区显示：PPI：144.36；像素：1920；英寸：13.3For example, entering Calculate = From size → PPI, Pixels (edge) = 1920, Inches (edge) = 13.3, PPI = 300 in the Pixels Per Inch (PPI) Calculator gives: PPI: 144.36; Pixels: 1920; Inches: 13.3

哪些输入会被检查？Which inputs are validated?

「PPI / 像素密度计算」会检查这些输入——「像素（边长）」、「英寸（边长）」、「PPI」：必须填写，须大于 0；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Pixels Per Inch (PPI) Calculator checks its inputs — "Pixels (edge)", "Inches (edge)", "PPI": required, must be greater than 0; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.

有哪些选项可以调整？What options can I adjust?

「PPI / 像素密度计算」的设置：「计算」可选 由尺寸算 PPI、由 PPI 算尺寸（默认 由尺寸算 PPI）；「像素（边长）」默认 1920；「英寸（边长）」默认 13.3；「PPI」默认 300。每次生成结果都按当前设置处理。Settings in the Pixels Per Inch (PPI) Calculator — "Calculate": From size → PPI, From PPI → size (default From size → PPI); "Pixels (edge)" default 1920; "Inches (edge)" default 13.3; "PPI" default 300. The result always uses the current settings.

「PPI / 像素密度计算」免费吗？需要注册吗？Is the Pixels Per Inch (PPI) Calculator free? Do I need an account?

「PPI / 像素密度计算」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Pixels Per Inch (PPI) Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.