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1153+ 款工具，面向开发者、设计师和日常任务。大多数工具在浏览器中运行 — 数据保留在您的设备上。部分工具需要外部服务。
热门工具
Base64 Encode & Decode
Encode and decode Base64 with UTF-8 support. Instant, private, browser-based. No upload, no signup.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case and kebab-case.
Hash Generator
Generate SHA-256, SHA-1, SHA-512 and SHA-384 hashes from any text. Uses Web Crypto API, fully private.
JSON 格式化工具
在浏览器中即时格式化、美化和验证 JSON。无上传，完全私密。
JWT Decoder
Decode JWT tokens and inspect the header and payload. See the decoded JSON content instantly.
Password Generator
Generate strong, random passwords with customizable length and character sets. Uses crypto.getRandomValues.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports ISO 8601 format.
URL Encode & Decode
Encode and decode URL (percent-encoding) with UTF-8 support. Instant, private, browser-based. No upload, no signup.
UUID Generator
Generate random UUIDs (v4) instantly in your browser. No upload, fully private.
Color Picker
Pick colors and get HEX, RGB, and HSL values in your browser. Free, online, no upload, fully private.
Image Compressor
Compress images in your browser to reduce file size. Adjust quality and download the optimized image. Free, private, no upload.
Image Resizer
Resize images in your browser. Set custom dimensions or maintain aspect ratio. Download the resized image.
JSON验证器
免费在线JSON验证器。在浏览器中即时处理数据。无上传，无注册，完全私密。
Regex Tester
Test regular expressions against any text in real-time. See all matches instantly with match count.
Text Diff Checker
Compare two pieces of text and see the differences highlighted. Added and removed lines are color-coded.
Word Counter
Count words, characters, sentences and paragraphs in your text instantly. No upload, fully private.
按分类浏览
精选合集
为常见工作流精选的工具集 — 选择一个合集，快速开始您的任务。
开发者必备
JSON、正则、JWT、哈希和 Base64 — 日常开发者工具包。
JSON 格式化工具
在浏览器中即时格式化、美化和验证 JSON。无上传，完全私密。
JSON验证器
免费在线JSON验证器。在浏览器中即时处理数据。无上传，无注册，完全私密。
Regex Tester
Test regular expressions against any text in real-time. See all matches instantly with match count.
JWT Decoder
Decode JWT tokens and inspect the header and payload. See the decoded JSON content instantly.
Hash Generator
Generate SHA-256, SHA-1, SHA-512 and SHA-384 hashes from any text. Uses Web Crypto API, fully private.
图片工具
压缩、调整大小、转换图片和提取颜色。
Image Compressor
Compress images in your browser to reduce file size. Adjust quality and download the optimized image. Free, private, no upload.
Image Resizer
Resize images in your browser. Set custom dimensions or maintain aspect ratio. Download the resized image.
Color Picker
Pick colors and get HEX, RGB, and HSL values in your browser. Free, online, no upload, fully private.
Color Converter
Convert colors between HEX, RGB and HSL instantly in your browser. No upload, fully private.
PDF 工具
合并、拆分、压缩 PDF 文档和提取文本。
PDF 合并工具
PDF 操作工具。即将推出。
PDF Splitter
Split a PDF into multiple files by page range or every N pages. Free, browser-based, no uploads — your file stays private.
PDF Compressor
Free online pdf compressor. Process data instantly in your browser. No upload, no signup, fully private.
PDF to Text Converter
Extract text content from PDF files in your browser. Free, online, no upload, fully private.
文本与内容
计数、转换、比较和转换文本内容。
Word Counter
Count words, characters, sentences and paragraphs in your text instantly. No upload, fully private.
Character Counter
Count characters, words, sentences, and paragraphs in your text. Free, online, no upload, fully private.
Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, PascalCase, snake_case and kebab-case.
Text Diff Checker
Compare two pieces of text and see the differences highlighted. Added and removed lines are color-coded.
MarkdowntoHTML
免费在线MarkdowntoHTML。在浏览器中即时处理数据。无上传，无注册，完全私密。
生成器
UUID、密码、时间戳和占位文本。
UUID Generator
Generate random UUIDs (v4) instantly in your browser. No upload, fully private.
Password Generator
Generate strong, random passwords with customizable length and character sets. Uses crypto.getRandomValues.
Timestamp Converter
Convert Unix timestamps to human-readable dates and vice versa. Supports ISO 8601 format.
Lorem Ipsum Generator
Generate Lorem Ipsum placeholder text with customizable paragraph count. Perfect for mockups and testing.
安全与加密
哈希、密码、JWT 和 Base64 — 安全工作用。
Hash Generator
Generate SHA-256, SHA-1, SHA-512 and SHA-384 hashes from any text. Uses Web Crypto API, fully private.
Password Generator
Generate strong, random passwords with customizable length and character sets. Uses crypto.getRandomValues.
JWT Decoder
Decode JWT tokens and inspect the header and payload. See the decoded JSON content instantly.
计算器
日常计算：百分比、年龄、BMI 和贷款。
Percentage Calculator
Calculate percentages easily. Find what is X% of Y, or what percentage X is of Y.
Age Calculator
Calculate exact age in years, months, and days from a birth date. Also shows total days lived.
BMI Calculator
Calculate your Body Mass Index (BMI) in metric or imperial units. See your weight category instantly.
Loan Calculator
Calculate monthly loan payments, total interest, and total cost. Supports any loan amount and interest rate.
教程与指南
了解每个工具的工作原理 — 实用教程、速查表和详解。
哈希算法详解：MD5、SHA-1、SHA-256、SHA-512
Understand cryptographic hash functions: differences between MD5, SHA-1, SHA-256, and SHA-512, and which to use for integrity checks vs password storage.
参考正则表达式速查表：语法、标志与常见模式
Complete regex reference: metacharacters, character classes, quantifiers, anchors, groups, flags, and ready-to-use patterns for emails, URLs, and dates.
问题解决密码安全性：如何生成、存储与审计强密码
Solve the most common password security problems: generating strong passwords, hashing them correctly, avoiding reuse, and auditing existing credentials.
对比Base64 vs Hex 编码：该使用哪一个？
Compare Base64 and Hex encoding across efficiency, readability, use cases, and trade-offs — and learn when to pick each for binary-to-text encoding.
对比CSV vs TSV：该使用哪种分隔符格式？
Compare CSV and TSV across delimiter choice, escaping, compatibility, and use cases — and learn when to pick each for tabular data.
教程如何压缩图片而不损失质量
Step-by-step guide to compressing images (JPEG, PNG, WebP) to reduce file size without visible quality loss using a free browser-based tool.
教程如何逐步压缩 PDF 文件
Step-by-step guide to compressing PDF files to reduce file size using a free browser-based tool. Learn compression levels and what affects PDF size.
教程如何在 HEX、RGB 与 HSL 之间转换颜色
Step-by-step guide to converting colors between HEX, RGB, HSL, and other formats using a free browser-based tool. Learn when to use each format.
参考库
查阅表和速查表 — JSON 语法、HTTP 状态码、MIME 类型等。
JSON语法参考
完整的JSON（RFC 8259）语法参考，包含数据类型、语法规则、示例和常见错误。
正则表达式速查表
正则表达式语法快速参考，包括字符、量词、锚点、分组和常用模式。
HTTP状态码参考
完整的HTTP状态码参考，包含描述、类别和使用示例。
MIME类型参考
常见MIME类型（互联网媒体类型）及其文件扩展名和描述。
HTML实体参考
常见HTML字符实体及其名称、十进制和十六进制代码。
IANA时区参考
IANA时区标识符，包含全球40个常用时区的UTC偏移量和描述。
CSS命名颜色参考
所有CSS命名颜色及其hex和RGB值。
Unix时间戳参考
Unix时间戳参考，包含常见里程碑、值范围和转换规则。
隐私设计，人人免费
100% 免费
无需注册，无需订阅，无隐藏费用。所有工具永久免费。
隐私设计
大多数工具在浏览器中本地处理数据。您的文件永远不会离开您的设备。
快速 & 浏览器端
无需下载或安装。工具通过 Web API、Web Workers 和 WASM 即开即用。
持续扩充的库
1153+ 个工具，覆盖 17 个分类，附带教程和参考。