Công cụ trực tuyến miễn phí

Add, subtract, multiply, transpose, invert, and find determinants of matrices up to 6×6.

Convert numbers to and from scientific notation, e-notation, and engineering notation. Enter decimals (299792458), e-notation (1.23e-5), or 1.23 × 10^5 format. Get normalized scientific, Unicode superscript, engineering (×10³), and decimal forms. Adjustable significant figures. Free, browser-based.

Plan lab dilutions with pipette volumes, 1:N ratio dilutions, and serial dilution schemes. Get C₁V₁=C₂V₂ stock aliquots, sample and diluent volumes, and step-by-step bench procedures in µL, mL, or L. Free, browser-based.

Graph mathematical functions y = f(x) instantly. Enter expressions like sin(x), x^2, exp(x), or multiple functions — get an SVG plot with axes, grid, and auto-scaling. Free, browser-based.

Combine multiple PDF files into one document in your browser, with drag-free reordering and instant download.

Resize images in your browser with custom dimensions, aspect-ratio lock, and format export.

Convert images between PNG, JPG, WebP, AVIF, and BMP right in your browser, with quality control and transparency handling.

Convert HEX color codes to HSL and HSLA values with hue, saturation, lightness, and a live preview.

Convert RGB screen colors to CMYK print values with cyan, magenta, yellow, and key (black) percentages.

Convert CMYK print color values to on-screen RGB and HEX for web and digital design.

Design layered CSS box shadows with live preview and copy-ready CSS, inline styles, and Tailwind classes.

Estimate YouTube ad revenue from views and RPM. See daily, monthly, and yearly earnings with monetized view rate adjustments.