Popular Tools

Calculate the exact countdown to any future date. Supports both Gregorian and Lunar calendars, displaying the remaining weeks, days, hours, minutes, and seconds.

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

Quickly calculate the area of a circle by entering the radius, diameter, or circumference. Supports custom units and precision settings.

Enter the face value, market price, coupon rate, and time to maturity to accurately calculate the annualized yield to maturity (YTM) of a bond.

Quickly calculate the least common multiple (LCM) of two or more integers. Supports space-separated number list input.

Play Chinese chess online in local two-player or simple computer mode, with legal-move hints, undo, and restart controls.

An online tool to calculate the greatest common divisor (GCD) of multiple integers. Supports space-separated number lists.

Convert HTTP/HTTPS file URLs into dedicated download links for Thunder, FlashGet, and QQ Xuanfeng to use with various download clients.

Quickly calculate the cube root of any number with customizable decimal places for accurate and reliable results.

Accurately convert between numeric amounts and Chinese uppercase/lowercase financial characters to meet formatting standards for Chinese contracts, invoices, and banking.

Generate fictional Japanese-style addresses with postal codes, prefectures, municipalities, and block numbers for development and QA testing.

Upload Python .pyc or .pyo bytecode files and attempt to recover readable, approximate .py source code.

Generate realistic, properly formatted fake Spanish addresses for development testing and data population.

Quickly calculate the day of the year, days remaining, and convert between lunar and solar calendars.

Generate formatted random phone numbers in bulk by country, region, carrier, or custom prefix. Deduplicate, copy, and export to TXT or CSV.

Customize character types and length to generate strong random passwords and secure your accounts.

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.

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