Popular Tools

Waist-to-Hip Ratio Calculator

Calculate your Waist-to-Hip Ratio (WHR) online to assess central obesity risks and monitor your physical health.

German Address Generator

Generate random, properly formatted German addresses for software testing, data population, and privacy protection.

MAC Address Vendor Lookup

Enter a MAC address to instantly identify the device manufacturer and detailed physical address. Perfect for network management and security auditing.

A-Series Paper to Pixels Converter

Convert physical dimensions of ISO 216 standard paper sizes (A0-A13) to pixel values at a specified DPI/PPI for design, printing, and screen adaptation.

Random IP Address Generator

Generate IPv4 and IPv6 addresses on demand. Supports specific public/private networks and custom CIDR ranges. Ideal for testing, development, and learning.

RGB & CIELab Color Converter

Two-way conversion between RGB and CIELab color spaces, providing precise color mapping for designers and developers.

CRC32 Checksum Calculator

Calculate the CRC32 hash of any string or encoded data to verify data integrity.

Arithmetic Sequence Generator

Generate standard arithmetic sequences using the first term, common difference, and number of terms. Ideal for math studies, programming, and data analysis.

Pressure Unit Converter

Supports accurate conversions between 14 pressure units including Pascals (Pa), psi, bar, and atm. Ideal for engineering, meteorology, and scientific research.

Random US Address Generator

Generate properly formatted fake US addresses for software testing, development, and data anonymization.

Logarithm Calculator

Quickly calculate natural, binary, and common logarithms with custom precision. Perfect for math students and scientific calculations.

JSON Formatter

Process JSON data online: format, minify, and validate to boost your development and debugging efficiency.

Trapezoid Area Calculator

Quickly calculate the area of a trapezoid by entering the top base, bottom base, and height. Supports custom units and precision settings.

QR Code Generator

Encode text, links, and other information into scannable QR code images with customizable error correction levels and colors.

A Series Paper Size Lookup

Quickly check ISO 216 standard A-series paper sizes from A0 to A13. View accurate dimensions in both millimeters and inches with aspect ratio references.

P/F Ratio Calculator

Calculate the P/F ratio using PaO2 and FiO2 to assess ARDS risk and pulmonary oxygenation function.