New Tools

TV Size and Viewing Distance Calculator

Quickly calculate the recommended TV size range based on your viewing distance and resolution.

TV Size Calculator

Input TV diagonal inches, instantly calculate screen width, height, area and recommended viewing distance.

XPath Online Tester

Test XPath expressions right in your browser and see matches instantly — great for web scraping, data collection, and front-end debugging.

邮箱图标生成器

输入邮箱地址，一键生成专属邮箱图标，适合个人品牌和网站使用。

Cylinder Calculator

Free online cylinder calculator. Enter the radius and height to quickly find the base area, lateral area, total surface area, and volume of any cylinder.

Rectangular Prism (Cuboid) Calculator

Enter length, width, and height to instantly calculate the base area, lateral surface area, total surface area, volume, and total edge length of a rectangular prism.

Online TOML to JSON Converter

Free online TOML to JSON converter. Easily convert TOML configuration files into JSON format for seamless cross-platform deployment and API integration.

JSON to SQL Converter

Free online tool to quickly convert JSON data into SQL INSERT statements. Supports both array and object formats.

PPI Calculator

Input display resolution and diagonal size to instantly calculate PPI, total pixels, and dot pitch.

Child Vaccination Schedule

Generate a personalized 0-6 year child vaccination schedule by birth date. Easily track your baby's immunization plan and never miss a shot.

Code to Image Tool

Generate beautiful code screenshots with one click, supporting multi-language syntax highlighting and customizable themes.

Root Mean Square (RMS) Calculator

Quickly calculate the Root Mean Square (RMS) of a dataset online. Perfect for signal analysis, AC effective values, and engineering calculations.

Gross Margin Calculator

Input revenue and costs to instantly calculate gross profit margin, gross profit amount, and cost ratio, helping you determine if your product and business are profitable.

QQ Direct Chat Tool

Enter a QQ number to instantly generate a link that opens a direct chat window without adding them as a friend.

Fraction Calculator

Free online fraction calculator to quickly add, subtract, multiply, and divide fractions. Easily simplify fractions and convert mixed numbers.

University Search

Enter a university name to quickly access official information including degree levels, location, and governing bodies.

Mouse Click Speed Test

Measure your mouse click speed (CPS) in real-time with this free online tool. Supports multiple time intervals, perfect for gamers and click speed training.

URL Unshortener

Paste a short link to quickly reveal the original long URL. Expand shortened URLs safely and check where they redirect before clicking.

日利率计算器(2026)

输入年利率或月利率，快速算出日利率、日利息和总利息。

Monthly Interest Rate Calculator (2026)

Input principal, annual interest rate, and number of periods to quickly get monthly interest rate, monthly interest, and monthly payment.