Popular Tools

Generate random UK-formatted addresses with valid postcodes, cities, and streets for testing and development.

Encrypt or decrypt text using the classic polyalphabetic substitution algorithm. Ideal for cryptography learning and testing.

Generate one random MAC address at a time with four separator styles, uppercase or lowercase output, and local result history.

Accurately calculate the time difference between two dates. Get results in years, months, weeks, days, hours, minutes, and seconds. Perfect for project management, countdowns, and anniversaries.

Enter data to generate 1D barcodes like EAN-13 and Code 128. Export PNG, JPEG, or SVG images for printing and scanning.

Online CRC16 checksum tool to calculate 16-bit cyclic redundancy check values for text, Hex, and Base64 data to verify data integrity.

Explore a QQ number’s digit patterns, rule-based score and entertainment estimate.

Enter your investment amount and dates to quickly calculate ROI and annualized return, helping you make smarter investment decisions.

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

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

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.

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

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.

Compare AES inputs and outputs using raw keys, configurable modes and padding for learning or compatibility checks.

Generate visually identical PNG/JPG images with a brand new MD5 hash to bypass duplicate detection or force cache updates.

A GB2312 encoding lookup tool — enter a Chinese character to get its area code, GB national-standard code, and internal code.

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.

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

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

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