# ToolKK (工具匠) > 1141+ free online tools across 12 categories — everyday utilities, developer tools, encryption & encoding, network & security, PDF & office, image & design, math & conversion, finance, health and video/audio. Available in 简体中文 / 繁體中文 / English / 日本語. Most tools are free; premium features use 匠币 (Craft Coins). ## Site Info - URL: https://www.toolkk.com - Languages: zh (简体中文), zh-TW (繁體中文), en (English), ja (日本語) - Tools: 1141+ free online tools - Categories: 12 - Pricing: most tools are free; premium features use 匠币 (Craft Coins) ## Key Pages - [Homepage](https://www.toolkk.com) - [All Tools](https://www.toolkk.com/tools) - [Hot Tools](https://www.toolkk.com/tools/hot) - [New Tools](https://www.toolkk.com/tools/new) - [API Products](https://www.toolkk.com/apis) - [Pricing](https://www.toolkk.com/pricing) - [Blog](https://www.toolkk.com/posts) - [Request Wall](https://www.toolkk.com/community) - [Download Apps](https://www.toolkk.com/download) ## Tool Categories (1141 tools) - [Crypto](https://www.toolkk.com/categories/crypt) (70 tools): Online encryption, decryption, and encoding conversion, supporting multiple algorithms such as MD5, Base64, and AES. - [Life](https://www.toolkk.com/categories/life) (136 tools): One-stop query for vehicle information, identity attribution, mobile phone numbers, enterprise business registration, yo… - [Datetime](https://www.toolkk.com/categories/datetime) (159 tools): Provides timestamp conversion, time zone query, date calculation, lunar calendar conversion, and online countdown. - [Finance](https://www.toolkk.com/categories/finance) (118 tools): Mortgage/Personal Income Tax/Loan Interest Rate Calculator, Real-time Exchange Rate Conversion, Invoice Verification, Co… - [Health](https://www.toolkk.com/categories/health) (41 tools): Online assessment and calculation of BMI, BFR, BMR, fetus, menstrual cycle, pregnancy and health index - [Network](https://www.toolkk.com/categories/network) (74 tools): Provides online query and detection tools such as webmaster SEO, IP domain name, DNS query, and vulnerability detection. - [Math](https://www.toolkk.com/categories/math) (124 tools): Supports unit conversion of length, area, temperature, pressure, etc., and calculation of mathematical formulas such as… - [Development](https://www.toolkk.com/categories/develop) (139 tools): Provides developer tools such as JSON, XML, YAML beautification and formatting, and code compression and obfuscation - [Office](https://www.toolkk.com/categories/office) (90 tools): Integrates various document processing and conversion functions such as text deduplication, keyword extraction, PDF merg… - [Image](https://www.toolkk.com/categories/image) (109 tools): Provides professional image processing tools such as QR code generation, ID photo creation, OCR recognition, image compr… - [Fun](https://www.toolkk.com/categories/fun) (53 tools): Covers fun and interesting creative tools such as Martian text conversion, pet age, lucky numbers, and emoticons. - [Media](https://www.toolkk.com/categories/media) (28 tools): A multimedia processing toolkit integrating video transcoding, audio extraction, format conversion, compression, and edi… ## Popular Tools - [Expiration Date Calculator](https://www.toolkk.com/tools/shelf-life-calculator): Calculate the expiration date based on the production date and shelf life, or check the near-expiry… - [Child Height Predictor Calculator](https://www.toolkk.com/tools/child-height-calculator): Enter the parents' heights and the child's gender to predict the child's adult height range based on… - [Pixel to Centimeter Converter](https://www.toolkk.com/tools/px-cm-converter): Input pixel values and PPI to instantly convert to corresponding physical length in centimeters, als… - [Pixel to Millimeter Converter](https://www.toolkk.com/tools/px-mm-converter): Convert between pixels and millimeters based on PPI density. Supports custom density values, ideal f… - [Inverse Trigonometric Function Calculator](https://www.toolkk.com/tools/anti-trigonometric-calculator): Accurately calculate radian values for inverse trig functions like arcsin and arccos. Supports 6 fun… - [CAGR Calculator](https://www.toolkk.com/tools/cagr-calculator): Calculate the Compound Annual Growth Rate (CAGR) of your investments. Enter the initial value, final… - [Random Email Generator](https://www.toolkk.com/tools/random-email-generator): Bulk generate random email addresses for testing and sign-ups with custom prefixes and domains. - [Simplified & Traditional Chinese Converter](https://www.toolkk.com/tools/simplified-traditional-translation): Accurately convert between Simplified Chinese, Standard Traditional, Taiwanese Traditional, and Hong… - [Age Calculator (Western, Chinese & Lunar)](https://www.toolkk.com/tools/age-calculator): Enter your birth date to instantly calculate your exact age, traditional Chinese age, and total days… - [Chinese to Pinyin Converter](https://www.toolkk.com/tools/pinyin-chinese-converter): Convert Chinese characters (Hanzi) to Pinyin with tone marks or numbers. Features smart polyphone re… - [Random Phone Number Generator](https://www.toolkk.com/tools/random-phone-number-generator): Generate random phone numbers by country, carrier, and prefix on demand for development, testing, an… - [Random Chinese Name Generator](https://www.toolkk.com/tools/random-chinese-name-generator): Bulk generate random Chinese names by gender, length, and surname for novels, games, and character d… - [Creatinine Clearance Calculator](https://www.toolkk.com/tools/ccr-calculator): Enter your age, weight, and serum creatinine to quickly assess your kidney function. - [100 Day Calculator (Baby's Hundred Days)](https://www.toolkk.com/tools/baby-hundred-days-calculator): Enter your baby's birth date to instantly view the Gregorian and Lunar dates, as well as the day of… - [Bazi to Gregorian Calendar Converter](https://www.toolkk.com/tools/horoscope-solar-converter): Free online two-way converter for Gregorian dates and Bazi (Four Pillars of Destiny). Supports Ziwei… - [Random Decimal Generator](https://www.toolkk.com/tools/random-decimal-generator): Generate random decimals with a specified range, decimal places, and quantity. Ideal for data analys… - [PX to REM Converter](https://www.toolkk.com/tools/px-rem-converter): A bidirectional PX to REM converter for front-end developers and designers, featuring customizable r… - [Noise Detector](https://www.toolkk.com/tools/noise-detection): Measure environmental noise decibel levels in real-time using your device's microphone. Evaluate noi… - [Lunar and Solar Calendar Converter](https://www.toolkk.com/tools/lunar-solar-converter): A tool for converting dates between the lunar and solar calendars. It supports lunar leap months and… - [Fuel Consumption Calculator](https://www.toolkk.com/tools/fuel-consumption): Calculate key data like fuel consumption per 100km (L/100km) and cost per kilometer based on your dr… - [Fetal Weight Calculator](https://www.toolkk.com/tools/fetus-weight-calculator): Quickly estimate fetal weight using ultrasound data like Biparietal Diameter (BPD), Abdominal Circum… - [BMR Calculator (Basal Metabolic Rate)](https://www.toolkk.com/tools/bmr-calculator): Calculate the minimum daily calories your body needs at rest based on gender, height, weight, and ag… - [PX to PT Converter](https://www.toolkk.com/tools/px-pt-converter): A pixel (PX) to point (PT) unit conversion tool for designers and developers. Supports custom PPI fo… - [Martian Text Converter](https://www.toolkk.com/tools/martian-generator): Convert between Simplified Chinese, Traditional Chinese, and Martian text (Huoxingwen) for personali… - [Body Fat Calculator](https://www.toolkk.com/tools/bfr-calculator): Calculate your body fat percentage using BMI and waist circumference formulas. Get instant body comp… - [Random Color Generator](https://www.toolkk.com/tools/random-color-generator): Provides controllable random color generation for designers and developers, supporting multiple form… - [Trigonometry Calculator](https://www.toolkk.com/tools/trigonometry-calculator): Calculate six trigonometric functions from radian values with custom decimal precision. - [Random Email Batch Generator](https://www.toolkk.com/tools/random-email-batch-generator): Generate correctly formatted random email addresses in bulk, with customizable domains and prefix ru… - [Random User Agent Generator](https://www.toolkk.com/tools/random-useragent-generator): Generate random browser User-Agent strings for developers, QA testers, and web scrapers to simulate… - [First Seven Mourning Date Calculator](https://www.toolkk.com/tools/death-seventh-calculator): Accurately calculate traditional memorial dates including the First Seven, Third Seven, Fifth Seven,… ## Optional - [llms-full.txt](https://www.toolkk.com/llms-full.txt): full list of all 1141 tools grouped by category - [Sitemap](https://www.toolkk.com/sitemap.xml)