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Unit converters

Length, weight, temperature, volume, area, speed, pressure and data sizes, with conversion tables and the exact factors used.

  • Cm to pixels converter

    Convert cm or mm to pixels at 72, 96, 150, 200, 300 or 600 DPI. 3.5 × 4.5 cm is 413 × 531 px at 300 DPI, A4 is 2480 × 3508 px and 1 cm is 38 px in CSS.

  • Hex to RGB converter

    Convert hex to RGB: paste a hex code like #4A90E2 and get rgb(74, 144, 226), each channel, CSS rgba() and HSL. Reads 3-, 6- and 8-digit codes with alpha.

  • Image to text converter

    Extract text from an image, screenshot or photo for free. Copy it or download a .txt file. OCR runs in your browser, so the picture is never uploaded.

  • Inches to pixels converter

    Work out how many pixels an inch needs at 72, 96, 150, 300 or 600 DPI. 2 × 2 inches is 600 × 600 px at 300 DPI; 8.5 × 11 in is 2550 × 3300 px.

  • Pixels to cm converter

    Convert pixels to centimetres and millimetres at 72, 96, 150, 300 or 600 PPI. 100 px is 2.646 cm on a 96 PPI screen; 1080 px is 28.575 cm, or 9.144 cm in print.

  • Pixels to inches converter

    Convert pixels to inches at 72, 96, 150, 300 or 600 DPI, for one length or a full width × height. 1920 × 1080 px prints at 6.4 × 3.6 in at 300 DPI.

  • Px to em converter

    Convert px to em and em to px using the parent element's font size, not the root. 24px in a 16px parent is 1.5em. Shows how nested em values compound.

  • Px to rem converter

    Convert px to rem and rem to px with the root font size you use. 24px is 1.5rem at the 16px browser default. Formula, conversion table and the 62.5% trick.

  • RGB to hex converter

    Convert RGB to hex: type red, green and blue (0–255) to get the #RRGGBB color code, 3-digit shorthand, HSL and CSS rgb(), with the formula and a color chart.