Popular Tools

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.

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

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

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

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

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

Play our free online virtual piano keyboard. Features selectable instrument tones, quick chord lookup, and MIDI/MP3 recording.

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

Generate properly formatted fake French addresses for testing, development, and privacy protection.

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

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

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

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

Generate batches of sample User-Agent strings from fixed browser and system templates.

Estimate the effect of one lump-sum prepayment on an equal-payment CNY mortgage.

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

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

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

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

Generate random English names for characters, accounts, or pets. Features gender filtering and quantity control.