Popular Tools

RGB to HSB Converter

Two-way RGB and HSB/HSV color code converter supporting multiple input formats. Ideal for designers and developers.

Stamp Duty Calculator

Calculate the payable tax for various contracts, documents, and account books based on the Stamp Duty Law. Supports both proportional and fixed-rate tax calculations.

Morse Code Translator

Translate text to Morse code and vice versa. Features custom dot/dash symbols and audio playback for learning and communication.

NTLM Hash Calculator

Calculate the NTLM hash of any string. Supports plaintext, Hex, and Base64 inputs, outputting results in Hex and Base64 formats.

Pixels to Inches Converter

Convert pixels to inches based on screen PPI. This free two-way converter (px to in and in to px) is perfect for graphic design, printing, and front-end web development.

Random US Address Generator

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

Death Anniversary Calculator

Automatically calculate important memorial milestones like the 1st and 3rd death anniversaries. Supports Gregorian and Lunar calendar conversions for easy memorial planning.

AES Encryption & Decryption Tool

Online AES encryption and decryption tool supporting multiple cipher modes and key lengths to ensure data security.

Waist-to-Hip Ratio Calculator

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

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.

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.

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.

压力单位换算

支持帕斯卡(Pa)、psi、bar、atm等14种压力单位间的精确换算，适用于工程、气象及科研领域。

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.