Popular Tools

Lucky Number Calculator

Calculate your personal lucky number based on your Gregorian birthday and generate a custom visual badge.

Text Case Converter

Online text case converter supporting multiple modes including uppercase, lowercase, and title case.

PX to EM Converter

A pixel and EM unit converter for front-end developers featuring custom base font sizes and real-time two-way conversion.

Baby Blood Type Calculator

Calculate your baby's possible blood types and genetic probabilities based on the parents' ABO and Rh factors.

Chinese D-Series Paper Size Lookup

Look up exact millimeter dimensions for D0 to D6 series paper based on the GB/T 19999-2003 national standard, suitable for book, magazine, and office paper design.

PX to Percentage Converter

Convert pixel values to percentages based on root font size. Ideal for CSS responsive design and fluid layouts.

US Paper Size Chart

Check US standard paper sizes, including everyday, ANSI, and ARCH series. Features millimeter and inch conversions with visual proportion charts.

MD5 Hash Generator

Generate MD5 hash values for any data. Ideal for data integrity checks, file verification, and more.

RGB & CMYK Color Converter

Professional bidirectional RGB and CMYK color code converter. Fix screen-to-print color shifts and get accurate, real-time conversion results.

Base Converter

Convert integers between binary, octal, decimal, and hexadecimal. Ideal for programming and mathematical calculations.

Temperature Unit Converter

Convert between 5 temperature units online, including Celsius, Fahrenheit, and Kelvin. Supports custom decimal precision and one-click copy.

Chinese ID Number Extractor

Quickly locate and extract mainland China ID numbers from any text. Supports both 15-digit and 18-digit formats and includes a total count.

Blood Pressure Calculator

A professional tool for assessing adult and pediatric blood pressure status, providing category references based on age, height, gender, and other factors.

Online DIG Lookup

Professional tool to query domain DNS records. Supports A, AAAA, MX, NS, and custom DNS servers.

File Encoding Detector

Identify text file character encoding formats to fix garbled text. Supports multi-language content analysis.

B Series Paper Size Chart & Dimensions Guide

Look up ISO 216 standard B series paper sizes. Get exact millimeter and inch dimensions for B0 to B10, plus a visual comparison chart.

ASCII Encoder & Decoder

Free online tool for two-way conversion between text and ASCII (decimal) codes. Ideal for programming, debugging, and data transmission.

Vehicle Inspection Date Calculator

Automatically calculate your vehicle inspection schedule and next due date based on vehicle type and initial registration date.

File MD5 Changer

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

AAEncode Encoder & Decoder - Obfuscate & Deobfuscate JS Online

Free online tool to encode JavaScript into the AAEncode obfuscated format or decode AAEncode strings back to readable JS code.