Popular Tools

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

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

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

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

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

Accurately calculate personal income tax and after-tax income for freelance work. Ideal for design, consulting, and other independent contractor scenarios.

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

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.

Bulk generate browser and device User-Agent strings to simulate real user environments and effectively bypass anti-scraping detection.

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

Calculate integer, decimal, or negative powers of any number. Supports scientific notation and is ideal for math and engineering calculations.

Calculate an uploaded file's CRC32 checksum locally in your browser, with chunked processing and progress feedback for files up to 100 MB.

Automatically calculate and generate a complete geometric sequence based on the first term, common ratio, and number of terms.