# 在线计算工具箱 | 好用的在线工具集合
# Online Calculator Toolbox | Professional Online Tools Collection

## 产品概览 / Product Overview

> **全能在线工具集合**：提供全面的在线计算和转换工具，包括【时间工具】（时间戳、Unix时间、GPS/北斗时间转换、日期计算、批量处理、Cron生成）、【加密工具】（RSA、AES全模式、国密SM2/SM4、Base64、摩斯密码）、【哈希与校验工具】（MD5、SHA全系列、SM3、HMAC、CRC全系列、BCC、LRC、Fletcher、Adler32、奇偶校验）、【格式化与开发工具】（JSON/XML格式化、Modbus RTU/调试）、【单位转换】（长度、重量、面积、体积、速度、温度、时间、能量等400+单位转换）以及【网络工具】（IP查询、子网计算）。所有工具均免费、本地计算、无需下载，支持桌面和移动设备。

> **Comprehensive Online Tool Collection**: Offering a wide range of online calculation and conversion tools, including [Time Tools] (Timestamp, Unix Time, GPS/BeiDou Conversion, Date Calculator, Batch Processing, Cron Generator), [Encryption Tools] (RSA, AES All Modes, Chinese SM2/SM4, Base64, Morse Code), [Hash & Checksum Tools] (MD5, SHA All Series, SM3, HMAC, CRC All Series, BCC, LRC, Fletcher, Adler32, Parity Check), [Formatter & Development Tools] (JSON/XML Formatter, Modbus RTU/Debug), [Unit Converters] (Length, Weight, Area, Volume, Speed, Temperature, Time, Energy - 400+ units), and [Network Tools] (IP Lookup, Subnet Calculator). All tools are free, perform calculations locally, require no download, and support both desktop and mobile devices.

## 核心工具分类 / Core Tool Categories

### 时间工具 / Time Tools
- **时间戳转换器** / **Timestamp Converter**: 在Unix时间戳（秒/毫秒）与人类可读日期格式（如ISO 8601, RFC 2822）之间进行高精度转换，支持全球时区选择。 *Convert between Unix timestamps (seconds/milliseconds) and human-readable date formats (e.g., ISO 8601, RFC 2822) with high precision, supporting global timezone selection.*
- **GPS/北斗时间转换** / **GPS & BeiDou Converter**: 实现GPS时间、北斗时间（BDT）与UTC时间之间的精确转换，包括周数和周内秒计算。 *Perform accurate conversions between GPS Time, BeiDou Time (BDT), and UTC, including week number and seconds-of-week calculations.*
- **日期计算器** / **Date Calculator**: 计算两个日期之间的精确间隔（年、月、日），支持工作日计算和在指定日期上加减时间段。 *Calculate the exact interval (years, months, days) between two dates, supporting business day calculations and adding/subtracting time periods from a specific date.*
- **Cron表达式生成器** / **Cron Expression Generator**: 可视化创建和解析Linux、Spring、Quartz格式的Cron表达式，提供执行时间预览和模板。 *Visually create and parse Cron expressions for Linux, Spring, and Quartz formats, providing execution time previews and templates.*
- **批量时间格式转换** / **Batch Time Converter**: 支持通过直接输入或上传文件（TXT, CSV, Excel）批量转换多种时间格式，可进行时间加减运算。 *Batch convert multiple time formats via direct input or file upload (TXT, CSV, Excel), with options for time arithmetic.*

### 加密解密工具 / Encryption Tools
- **RSA加密解密** / **RSA Encrypt/Decrypt**: 提供在线RSA公钥加密和私钥解密，支持512至4096位密钥，PKCS#1 v1.5/OAEP/无填充模式，PEM/HEX格式。 *Online RSA public key encryption and private key decryption, supporting 512 to 4096-bit keys, PKCS#1 v1.5/OAEP/No Padding modes, and PEM/HEX formats.*
- **AES加密解密** / **AES Encrypt/Decrypt**: 支持AES-128/192/256位密钥，以及ECB, CBC, CFB, OFB, CTR, GCM全模式，提供多种填充选项（PKCS#7, ZeroPadding等）。 *Supports AES-128/192/256 bit keys and all major modes (ECB, CBC, CFB, OFB, CTR, GCM), with various padding options (PKCS#7, ZeroPadding, etc.).*
- **SM2/SM4加解密** / **SM2/SM4 Encrypt/Decrypt**: 实现中国国家商用密码标准SM2（公钥）和SM4（分组）的在线加解密。 *Perform online encryption and decryption using Chinese national cryptographic standards SM2 (public key) and SM4 (block cipher).*
- **Base64编解码** / **Base64 Encoder/Decoder**: 支持文本和二进制数据与Base64格式之间的相互转换，可选UTF-8或HEX输入/输出，提供URL安全模式。 *Convert text and binary data to/from Base64 format, supporting UTF-8 or HEX input/output, with a URL-safe option.*
- **摩斯密码转换** / **Morse Code Converter**: 在文本与国际摩尔斯电码之间进行转换，支持字母、数字、标点符号，并提供声音播放功能。 *Translate between text and International Morse Code, supporting letters, numbers, punctuation, and featuring audio playback.*

### 哈希工具 / Hash Tools
- **MD5/SHA哈希生成器** / **MD5/SHA Hash Generator**: 计算文本或文件的MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA3系列及RIPEMD160哈希值。 *Calculate hash values (MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA3 series, RIPEMD160) for text or files.*
- **SM3哈希计算器** / **SM3 Hash Calculator**: 生成中国国家商用密码标准SM3算法的256位哈希摘要。 *Generate 256-bit hash digests using the Chinese national cryptographic standard SM3 algorithm.*
- **HMAC生成器** / **HMAC Generator**: 使用密钥和消息计算HMAC（基于哈希的消息认证码），支持MD5, SHA系列, SHA3系列, RIPEMD160等多种哈希算法。 *Calculate HMAC (Hash-based Message Authentication Code) using a key and message, supporting various hash algorithms like MD5, SHA series, SHA3 series, RIPEMD160.*

### 校验工具 / Checksum Tools
- **CRC校验计算器** / **CRC Calculator**: 支持CRC-8, CRC-16, CRC-32, CRC-64等多种标准和自定义多项式的CRC校验码计算，用于数据完整性验证。 *Calculate CRC checksums using various standards (CRC-8, CRC-16, CRC-32, CRC-64) or custom polynomials for data integrity verification.*
- **BCC/异或校验** / **BCC/XOR Checksum**: 计算基于字节异或运算的块校验字符（BCC），一种简单的数据校验方法。 *Calculate Block Check Character (BCC) based on byte-wise XOR operation, a simple data verification method.*
- **LRC纵向冗余校验** / **LRC Calculator**: 计算纵向冗余校验码，常用于Modbus ASCII等协议。 *Calculate Longitudinal Redundancy Check (LRC), often used in protocols like Modbus ASCII.*
- **Fletcher校验和** / **Fletcher Checksum**: 实现Fletcher-16和Fletcher-32校验算法，提供比简单校验和更好的错误检测能力。 *Implement Fletcher-16 and Fletcher-32 checksum algorithms, offering better error detection than simple checksums.*
- **Adler32校验和** / **Adler32 Checksum**: 计算快速的Adler-32校验和，常用于zlib和ZIP文件格式。 *Calculate the fast Adler-32 checksum, commonly used in zlib and ZIP file formats.*
- **奇偶校验计算** / **Parity Check Calculator**: 计算数据的奇校验位或偶校验位，用于基础的错误检测。 *Calculate the odd or even parity bit for data, used for basic error detection.*

### 格式化工具 / Formatter Tools
- **JSON格式化工具** / **JSON Formatter**: 在线美化、压缩、验证JSON数据，支持语法高亮、错误定位、代码折叠和树状视图。 *Online beautify, minify, and validate JSON data, featuring syntax highlighting, error location, code folding, and tree view.*
- **XML格式化工具** / **XML Formatter**: 格式化和验证XML文档，使其结构清晰易读。 *Format and validate XML documents to make them well-structured and readable.*
- **CSV/TSV格式转换** / **CSV/TSV Converter**: 在CSV（逗号分隔值）和TSV（制表符分隔值）等表格数据格式之间进行转换。 *Convert between tabular data formats like CSV (Comma-Separated Values) and TSV (Tab-Separated Values).*

### Modbus工具 / Modbus Tools
- **Modbus RTU工具** / **Modbus RTU Tool**: 专业的Modbus RTU协议工具，支持功能码命令生成、响应模拟、数据帧解析，包含CRC16校验。 *Professional Modbus RTU protocol tool supporting function code command generation, response simulation, data frame parsing, including CRC16 checksum.*
- **Modbus调试工具** / **Modbus Debug Tool**: 提供在线Modbus串口/TCP调试功能，支持浏览器直接连接串口设备（需硬件支持），实时数据采集、解析和可视化。 *Provides online Modbus serial/TCP debugging, allowing direct browser-to-serial connection (requires hardware support), real-time data acquisition, parsing, and visualization.*

### 单位转换工具 / Unit Converters
- **综合单位转换** / **Comprehensive Unit Converter**: 支持长度、重量、面积、体积、速度、温度、时间、能量、压力、功率、数据存储等超过400种单位之间的精确相互转换。 *Supports precise mutual conversion between over 400 units across categories like Length, Weight, Area, Volume, Speed, Temperature, Time, Energy, Pressure, Power, Data Storage, etc.*


## 产品特点 / Product Features

### 数据安全与隐私 / Data Security & Privacy
- **纯客户端计算** / **Client-Side Processing**: 绝大部分计算和转换都在您的浏览器本地完成，敏感数据不离开您的设备，不上传至服务器。 *Most calculations and conversions are performed locally in your browser. Sensitive data does not leave your device and is not uploaded to servers.*
- **无需注册登录** / **No Registration Required**: 所有核心功能无需注册或登录即可免费使用，最大限度保护用户隐私。 *All core features are available for free without registration or login, maximizing user privacy.*
- **HTTPS安全访问** / **HTTPS Secure Access**: 网站全程使用HTTPS加密传输，防止数据在传输过程中被窃取或篡改。 *The entire website uses HTTPS encryption to prevent data interception or tampering during transmission.*

### 易用性与可访问性 / Usability & Accessibility
- **响应式设计** / **Responsive Design**: 界面自动适应不同尺寸的屏幕，在电脑、平板和手机上均提供良好体验。 *The interface automatically adapts to different screen sizes, providing a good experience on desktops, tablets, and mobile phones.*
- **简洁直观界面** / **Simple & Intuitive Interface**: 设计简洁，操作流程清晰，降低用户学习成本，易于上手。 *Clean design and clear workflows reduce the learning curve and make tools easy to use.*
- **批量处理支持** / **Batch Processing Support**: 多个工具支持批量输入或文件上传，提高处理大量数据的效率。 *Several tools support batch input or file uploads, improving efficiency when handling large amounts of data.*
- **辅助功能** / **Accessibility Features**: 考虑可访问性设计，支持键盘导航和适当的对比度。 *Accessibility considerations include keyboard navigation and appropriate contrast ratios.*

### 专业性与准确性 / Professionalism & Accuracy
- **高精度算法** / **High-Precision Algorithms**: 采用经过验证的专业算法库，确保计算结果的准确性和可靠性。 *Utilizes verified professional algorithm libraries to ensure the accuracy and reliability of calculation results.*
- **丰富自定义选项** / **Rich Customization Options**: 提供多种参数和格式选项，满足不同专业场景下的特定需求。 *Offers various parameter and format options to meet specific requirements in different professional scenarios.*
- **符合行业标准** / **Industry Standard Compliance**: 工具实现遵循相关行业标准和规范（如RFC, ISO, 国密标准等）。 *Tool implementations adhere to relevant industry standards and specifications (e.g., RFCs, ISO standards, Chinese national crypto standards).*
- **持续更新维护** / **Continuous Updates & Maintenance**: 定期更新算法库，修复潜在问题，增加新功能，保持工具的先进性。 *Regularly updates algorithm libraries, fixes potential issues, adds new features, and keeps the tools up-to-date.*

### 多语言与国际化 / Multilingual & Internationalization
- **中英双语支持** / **Bilingual Support (CN/EN)**: 提供中文和英文两种界面语言，方便不同语言用户使用。 *Offers both Chinese and English interface languages for users from different linguistic backgrounds.*
- **全球时区兼容** / **Global Timezone Compatibility**: 时间工具支持全球主要时区，方便进行跨时区时间换算。 *Time tools support major global timezones for easy cross-timezone conversions.*
- **本地化格式** / **Localized Formatting**: 数字、日期和单位名称的显示会根据语言设置进行本地化调整。 *Display of numbers, dates, and unit names are localized based on language settings.*

## 常见问题 / FAQs

### 数据安全问题 / Data Security
**Q: 我的敏感数据（如密钥、待加密文本）安全吗？ / Is my sensitive data (like keys, text to encrypt) secure?**
**A:** 是的。绝大部分工具的计算完全在您的浏览器本地进行，数据不会发送到我们的服务器。我们高度重视用户隐私和数据安全。 / Yes. Calculations for most tools are performed entirely locally within your browser. Your data is not sent to our servers. We highly value user privacy and data security.

**Q: 网站是否会记录我的输入或操作？ / Does the website log my input or actions?**
**A:** 我们不记录用户在工具中输入的具体数据。我们可能收集匿名的使用统计信息（如哪些工具被访问）以改进服务，但这不包含您的个人输入内容。 / We do not log the specific data you enter into the tools. We may collect anonymous usage statistics (like which tools are visited) to improve our service, but this does not include your personal input content.

### 工具准确性 / Tool Accuracy
**Q: 计算结果是否绝对准确？ / Are the calculation results absolutely accurate?**
**A:** 我们使用行业标准算法和经过验证的库来确保高准确性。但对于涉及浮点运算或复杂转换的场景，可能存在极小的舍入误差。我们努力将误差控制在实际应用允许的范围内。 / We use industry-standard algorithms and verified libraries to ensure high accuracy. However, for scenarios involving floating-point arithmetic or complex conversions, extremely small rounding errors might occur. We strive to keep errors within acceptable limits for practical applications.

### 浏览器和设备兼容性 / Browser & Device Compatibility
**Q: 我需要特定的浏览器或操作系统吗？ / Do I need a specific browser or operating system?**
**A:** 不需要。我们的网站支持所有现代主流浏览器（Chrome, Firefox, Safari, Edge等）的最新版本，并且兼容Windows, macOS, Linux, Android, iOS等操作系统。 / No. Our website supports the latest versions of all modern major browsers (Chrome, Firefox, Safari, Edge, etc.) and is compatible with Windows, macOS, Linux, Android, and iOS operating systems.

**Q: 手机上使用体验如何？ / How is the experience on mobile devices?**
**A:** 网站采用响应式设计，针对手机和平板电脑进行了优化，确保在小屏幕上也能方便地使用所有工具。 / The website uses responsive design and is optimized for mobile phones and tablets, ensuring all tools are easy to use even on smaller screens.

### 使用限制与费用 / Usage Limits & Cost
**Q: 使用这些工具有次数或功能限制吗？是否收费？ / Are there any usage limits or feature restrictions? Is it free?**
**A:** 目前所有工具的核心功能完全免费，且没有硬性的使用次数限制。我们致力于提供免费、便捷的工具服务。 / Currently, all core features of the tools are completely free, and there are no hard limits on usage frequency. We are committed to providing free and convenient tool services.

**Q: 是否有付费版本或高级功能？ / Is there a paid version or premium features?**
**A:** 目前没有。未来我们可能会考虑提供一些增值服务，但核心工具将保持免费。 / Not at the moment. We might consider offering some value-added services in the future, but the core tools will remain free.

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