Discover Useful Tools
Search through our collection of practical tools to help you work and live more efficiently
Text Case Converter
Free online text case conversion tool, supports 17 formats real-time conversion including UPPERCASE, lowercase, Capitalized Case, camelCase, snake_case, kebab-case, Title Case, tOGGLE cASE, aLtErNaTiNg cAsE, etc. One-click copy results, suitable for programming naming, copywriting layout, code variable naming and other scenarios.
Cube Continent - Crafting Simulator
Cube Continent game crafting simulator, supports simulated crafting, query item crafting recipes, and add new crafting recipes. Supports all item tiers from T1 to T6, helping players quickly find crafting methods.
Random Password Generator
Free online random password generator tool, supports custom password length, options to include uppercase and lowercase letters, numbers, special symbols, etc., real-time password strength detection, one-click copy of generated secure passwords. Suitable for account registration, password reset, security key generation and other scenarios, pure front-end generation ensures privacy and security.
Text Length Statistics
Free online text statistical analysis tool, real-time statistics of character count, word count, sentence count, paragraph count, byte size, reading time, etc., supports Chinese and English text analysis and high-frequency vocabulary statistics.
Percentage Calculator
Free online percentage calculation tool, supports multiple calculation modes such as percentage calculation, percentage increase/decrease, percentage difference, etc. Real-time calculation results, save calculation history, suitable for financial analysis, data statistics, discount calculation, growth rate calculation and other scenarios, with a simple and easy-to-use interface.
Temperature Unit Converter
Free online temperature unit conversion tool, supports real-time conversion between 11 temperature units including Celsius, Fahrenheit, Kelvin, Rankine, Réaumur, and Rømer.
HTTP Status Code Lookup Tool
Free online HTTP status code query tool, provides a complete HTTP status code reference manual. Supports filtering by category, keyword search, and includes detailed explanations, causes, and solutions for all standard status codes including 1xx informational responses, 2xx success responses, 3xx redirections, 4xx client errors, and 5xx server errors.
HASH Calculator
Free online HASH calculation tool, supports multiple hash algorithms such as MD5, SHA1, SHA224, SHA256, SHA384, SHA512, SHA3-256, SHA3-512, RIPEMD-160, supports multiple output formats including hexadecimal, Base64, and binary, with the option to add salt value to enhance security.
URL Encoder/Decoder
Free online URL encoding and decoding tool, supports RFC 3986 standard encoding, form encoding, UTF-8 hexadecimal, Base64 and many other formats, real-time conversion, batch processing, essential tool for web development and debugging.
HTML Entity Escaper
Free online HTML entity escape tool, supports HTML code escaping and unescaping, provides multiple escape modes such as basic, complete, minimal, numeric, etc., quickly convert HTML special characters, prevent XSS attacks and HTML parsing errors.
URL Parser & Analyzer
Free online URL analysis tool, supports URL parsing, validation, formatting, and comparison. One-click analyze URL structure, validate URL validity, format URL, compare differences between two URLs, suitable for web development, API debugging, and link management.
KeyCode Lookup Tool
Free online KeyCode lookup tool, real-time detection of keyboard keys, query keyCode, code, which and other code value information. Supports lookup of common key codes for letter keys, number keys, function keys, control keys, navigation keys, symbol keys, etc. Provides key type classification filtering, an essential development aid for front-end developers and programmers.
Date Time Converter
Free online date and time conversion tool, supports timestamp conversion, timezone conversion, mutual conversion between multiple date formats, provides batch conversion functionality. Suitable for development debugging, data analysis, cross-timezone collaboration and other scenarios.
Integer Base Converter
Free online integer base conversion tool, supports mutual conversion between bases 2-64 including binary, octal, decimal, hexadecimal, etc. Enter a value in any base, and other bases will be automatically calculated. Suitable for programming development, mathematical calculations and other scenarios.
Roman Numeral Converter
Free online Roman numeral conversion tool, supports mutual conversion between Arabic numbers and Roman numerals, provides step-by-step conversion breakdown and common number reference. Suitable for learning Roman numerals, historical research, programming development and other scenarios.
Git Commands Cheat Sheet
Free online Git commands cheat sheet tool, provides quick lookup of commonly used Git commands and one-click copy functionality. Includes complete categories such as basic operations, branch management, remote operations, history viewing, undo operations, supports search and category filtering.
WiFi Code Generator
Free online WiFi QR code generator tool, supports multiple encryption types such as WPA/WPA2/WEP/No encryption, customizable QR code size and style. Scan the code to quickly connect to WiFi network without manually entering the password, suitable for stores, homes, and conference scenarios.
QR Code Generator
Free online QR code generator tool, supports multiple content types such as text, URLs, phone numbers, emails, WiFi configuration, geographic locations, etc. Customizable size and error correction level, one-click generate and download PNG or SVG format.
SVG Placeholder Image Generator
Free online SVG placeholder image generation tool, supports custom size, background color, border, rounded corners, text and fill patterns. Suitable for web design prototypes, UI component placeholders, document examples and other scenarios, no download required, generate and use instantly.
Text Difference Comparison
Free online text difference comparison tool, based on Monaco Editor, supports difference comparison of text content such as code and documents, highlights added, deleted and modified content, supports real-time statistics of changed line counts, suitable for code version comparison, document proofreading and other scenarios.
Chinese to Pinyin Converter
Free online Chinese character to Pinyin conversion tool, supports multiple Pinyin styles such as with tone marks, without tone marks, numeric tone marks, initials, etc., supports polyphonic character recognition, batch conversion, file upload and other features, suitable for learning Pinyin, pronunciation annotation and other scenarios.
Simplified-Traditional Chinese Converter
Free online Simplified-Traditional Chinese conversion tool, supports mutual conversion between Simplified Chinese and Traditional Chinese. Supports file upload, history saving, suitable for document processing, web content conversion and other scenarios, with a simple and easy-to-use interface.
Length Unit Converter
Free online length unit conversion tool, supports real-time conversion between 12 length units including meter, kilometer, centimeter, millimeter, inch, foot, mile, nautical mile, light year, etc. Enter any length value to automatically calculate the corresponding values for all units.
UUID Generator
Free online UUID generation tool, supports batch generation of all UUID versions V1/V3/V4/V5, with customizable format (uppercase/lowercase, with or without hyphens), one-click copy or download. Suitable for database primary keys, API keys, distributed IDs, session identifiers and other scenarios, no download or installation required, free and ad-free.
Color Picker Tool
Professional online color picker tool, supports conversion of multiple color formats such as HEX, RGB, HSL, HWB, LCH, CMYK, with real-time preview, transparency adjustment, and preset color library, providing convenient color management solutions for designers and developers.
Random String Generator
Free online random string generation tool, supports generating secure passwords, API keys, verification codes, hexadecimal strings, etc. Provides multiple generation modes and customization options, uses cryptographic random number generation, real-time entropy calculation, supports batch generation and export.
ASCII Code Quick Reference
Free online ASCII character table lookup tool, supports decimal, hexadecimal, binary, octal conversion, includes complete character set of basic ASCII (0-127) and extended ASCII (128-255), essential character encoding query tool for programmers.
Chinese Capital Amount Converter
Free online Chinese capital amount conversion tool, supports bidirectional conversion between numeric amounts and Chinese capital amounts. Provides real-time conversion and batch conversion functions, complies with financial standards, accurate to the cent. Suitable for financial reimbursement, invoice issuance, contract amounts and other scenarios.
Random Number Generator
Free online random number generation tool, supports generating random integers, floating-point numbers, Gaussian distribution random numbers, and random arrays. Provides pseudo-random and cryptographically secure random number modes, supports batch generation, sorting, deduplication and other features, suitable for lucky draws, password generation, scientific computing and other scenarios.
Unicode Converter
Free online Unicode encoding conversion tool, supports converting text to Unicode and Unicode to text, supports multiple encoding formats such as U+ format, HTML entities, Java, Python, etc., real-time conversion, convenient and fast.
Paper Size Lookup
Free online paper size lookup tool, supports full series of paper size comparison including ISO A/B/C series, North American standards, photo sizes, special specifications, etc. Provides dual unit display in millimeters (mm) and inches (in), aspect ratio calculation, common usage explanations, an essential paper specification reference tool for designers and printing professionals.
Material Density Lookup
Free online material density lookup tool, provides density data for various materials including metals, non-metals, liquids, and gases. Supports multi-unit switching, an essential material reference tool for engineers and researchers.
World Flags Encyclopedia
Free online tool for searching national and regional flags worldwide, provides high-resolution flag images for viewing and download. Supports filtering by region, flag type, and search queries, includes detailed flag information such as adoption year, aspect ratio, color composition, and more.
China Region Lookup
Free online China region information lookup tool, supports five-level administrative division queries from province to village, includes complete region information such as postal code, telephone area code, ID card prefix, license plate prefix, etc. Real-time query, accurate data, no download required, suitable for address filling, information verification, data analysis and other scenarios.
Proportion Calculator
Free online proportion calculation tool, supports basic proportion calculation, multi-value ratio simplification, proportional scaling of dimensions, percentage calculation, fraction calculation. Suitable for design, photography, video production and other scenarios, helps quickly calculate aspect ratios, scaling ratios, etc.
Area Unit Converter
Free online area unit conversion tool, supports real-time conversion between 18 area units including square meter, square kilometer, hectare, acre, mu, square foot, etc. Includes four main categories: international units, metric units, imperial units, and Chinese customary units. Enter any area value to automatically calculate the corresponding values for all units.
Volume Unit Converter
Free online volume unit conversion tool, supports real-time conversion between 25 volume units including cubic meter, liter, milliliter, gallon, pint, barrel, etc. Includes four main categories: international units, metric volume units, imperial units, and US units. Enter any volume value to automatically calculate the corresponding values for all units.
Weight Unit Converter
Free online weight unit conversion tool, supports real-time conversion between 23 weight units including kilogram, gram, pound, ounce, jin, liang, etc., and provides reference weights for common objects.
Volume Calculator
Free online volume calculation tool, supports volume calculation of 8 common geometric shapes: cube, cuboid, sphere, cylinder, cone, triangular prism, quadrangular pyramid, and torus. Enter geometric parameters to automatically calculate volume, surface area and other data, supports multiple unit conversions, simple and easy-to-use interface.
Perimeter Calculator
Free online perimeter calculation tool, supports perimeter calculation of 7 common geometric shapes: square, rectangle, triangle, circle, ellipse, regular polygon, and trapezoid. Enter shape parameters to automatically calculate the perimeter, supports multiple length unit conversions.
Featured Tools
Hand-picked everyday utilities, ready to use
文本大小写转换
“文本大小写转换” 是便捷的文本处理工具。输入文本可转全部大小写、首字母大写等，支持驼峰、蛇形等命名格式。操作简单，一键复制结果，能处理大量文本，满足办公、编程等场景需求。
URL编码/解码
专业在线 URL 编码 / 解码工具，支持快速将 URL 中的特殊字符编码为安全格式，也能将编码后的 URL 准确解码还原。操作简便，可实时处理，支持批量操作。适用于网页开发、数据传输、链接分享等场景，有效避免 URL 解析错误，保障数据安全与传输的准确性。
One-Click Image Matting
Free online one-click background removal tool. By default a high-precision server-side AI model detects portrait and object subjects and removes backgrounds in one click to generate transparent PNGs; you can also switch to the local model, keeping images inside your browser. Supports batch matting with ZIP export, browsing images by folder, color-based matting, manual erase and restore, undo and redo.
PDF Merger
Free online PDF merger tool to combine multiple PDF files into one PDF. No server upload required, all operations are done locally in your browser to protect your file privacy.
PDF Page Rotator
Free online PDF page rotation tool. Rotate pages in your PDF file 90° clockwise, 90° counter-clockwise, or 180°. Support individual page rotation and batch operations. All processing is done locally in your browser - no files are uploaded to any server, ensuring your privacy.
中国地区信息查询工具
中国地区信息查询在线工具，提供全面、权威的地区相关信息查询服务。可查询全国各地区的行政区划、地名由来、历史沿革等信息，涵盖省、市、县、乡等各级行政区域。部分工具还整合了统计数据，能让用户获取地区的人口、经济、地理等统计资料。支持按地区名称、行政区划代码等多种方式检索，数据更新及时，信息准确可靠。适用于地理研究、政策制定、教育教学等场景，方便用户快速获取所需的中国地区信息。
Tutorial Center
Original step-by-step guides to get more out of our tools
How to Use the "Image 9-Grid/Multi-Grid Slice" Tool: A Zero-Basis Guide from Page Access to Results
This article details the complete usage process of the online tool "Image 9-Grid/Multi-Grid Slice". This tool supports one-click cutting of images into custom grids such as 3×3 and 4×4, and allows adjustment of dividing lines and borders. The article covers feature analysis, operation steps, parameter settings, and frequently asked questions, helping zero-basis users quickly master image slicing skills. It is suitable for social media publishing and creative poster making. No software installation is required; simply open the webpage to use it.
Read tutorialHow to Use a Brazilian Name Generator: A Complete Workflow from a Real-World Need 副标题>Quickly Generate Random Names That Align with Brazilian Cultural Norms to Solve Temporary Naming Challenges 摘要>This article uses the example of needing a
本文以临时需要巴西人名为例，详解巴西姓名生成器的使用路径。从输入需求到获取结果，分析其输出效果与隐性成本。明确该工具作为辅助手段的边界，适合需要快速生成符合当地命名习惯的随机姓名场景，提升内容创作或测试效率。
Read tutorialHow to Use the CSS Dashed Border Generator: A Zero-Code Guide from Start to Finish
The CSS Dashed Border Generator is an online visual tool for adjusting dashed border styles. Intuitively modify color, thickness, and spacing through the interface, preview effects in real-time, and generate corresponding CSS code. No need to manually write complex syntax; it is suitable for web design and front-end development scenarios, supports one-click code copying, improves development efficiency, and offers free basic features.
Read tutorialFree Online Tools for Work and Everyday Tasks
Efficient Tool is a free online toolbox with 700+ browser-based utilities covering text processing, unit conversion, math calculators, image editing, file conversion, encryption, developer helpers, study aids and more. Every tool runs directly in your browser — no download, no installation, no sign-up required. Open a tool, paste your content and get results in seconds; whenever technically possible your data is processed locally on your device and never stored on our servers.
- Free forever: all core features are open with no hidden charges and no usage quotas.
- No installation: everything runs in the browser on Windows, macOS, Linux, tablets and phones.
- Privacy first: text and files are processed locally whenever possible, over encrypted connections otherwise.
Frequently Asked Questions
Are these online tools really free?
Yes. Every tool on the site is free to use with no hidden fees and no usage quotas. A free account is only needed for convenience features such as favorites and cross-device history sync — the core functionality always works without registration.
Do I need to create an account?
No. Almost all tools can be used anonymously straight away. An account is purely optional and only adds convenience features like saving favorite tools and syncing usage history across devices.
Is it safe to paste sensitive text or upload files?
Whenever technically possible, processing happens entirely in your browser, so your content never leaves your device. Tools that do need server-side processing use encrypted connections, and uploaded files are deleted automatically once processing is complete.