Redmoon Converters 在任意DPI/PPI下将像素尺寸换算为厘米、毫米和英寸的实际尺寸，并提供印刷预备用的出血线和安全区辅助工具。
| Format | Width | Height |
|---|
Inches = pixels ÷ DPI. cm = inches × 2.54. mm = inches × 25.4. Bleed is added to all four edges; the trim box stays the input size, the bleed box is larger.
Reverse: pixels = inches × DPI. For print, 300 DPI is the floor for crisp text; 150 is acceptable for posters viewed at distance.
Typography Scale Generator (Modular Type Scale)
Generate a modular type scale in rem, px and em from any base size and ratio, with line-height pairs.
Color Converter — HEX, RGB, HSL, OKLCH & Contrast
Convert any color between HEX, RGB, HSL, HWB, OKLCH and LCH, with WCAG contrast checking against any background.
Aspect Ratio Resizer (Image, Video, Social)
Resize any dimensions while keeping aspect ratio, with presets for Instagram, TikTok, YouTube and cinema formats.
Paper Size Converter (A4 / Letter / B-Series / JIS)
Convert between ISO A/B/C, US Letter / Legal / Tabloid and Japanese JIS paper sizes in mm and inches.
Font Size Converter (pt, px, rem, em, %)
Convert font sizes between pt, px, rem, em and % for web and print typography.