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快速、隱私優先、瀏覽器內處理
1153+ 個工具，服務開發者、設計師與日常需求。大多數工具在您的瀏覽器中執行 — 資料留在您的裝置上。部分工具需要外部服務。
熱門工具
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
在瀏覽器中即時格式化、美化與驗證 JSON。無需上傳，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驗證器
免費線上JSON驗證器。在瀏覽器中即時處理資料。無上傳，無註冊，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.
依分類瀏覽
精選合集
為常見工作流程策劃的工具集 — 選擇一個合集快速展開您的任務。
開發者必備
JSON、正規、JWT、雜湊和 Base64 — 日常開發者工具包。
JSON 格式化工具
在瀏覽器中即時格式化、美化與驗證 JSON。無需上傳，完全私密。
JSON驗證器
免費線上JSON驗證器。在瀏覽器中即時處理資料。無上傳，無註冊，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.
圖片工具
壓縮、調整大小、轉換圖片和提取顏色。
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
合併、拆分、壓縮 PDF 文件和提取文字。
PDF 合併工具
將多個 PDF 檔案合併為一份文件。免費、瀏覽器端運作、無需上傳 — 您的檔案保持私密。
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.
文字與內容
計數、轉換、比較和轉換文字內容。
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
免費線上MarkdowntoHTML。在瀏覽器中即時處理資料。無上傳，無註冊，完全私密。
產生器
UUID、密碼、時間戳和佔位文字。
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.
安全與加密
雜湊、密碼、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.
計算機
日常計算：百分比、年齡、BMI 和貸款。
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.
指南與教學
了解每個工具的運作方式 — 實用指南、速查表與說明。
雜湊演算法詳解：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.
參考正規表示式速查表：語法、旗標與常見模式
Complete regex reference: metacharacters, character classes, quantifiers, anchors, groups, flags, and ready-to-use patterns for emails, URLs, and dates.
問題解決密碼安全性：如何產生、儲存與稽核強密碼
Solve the most common password security problems: generating strong passwords, hashing them correctly, avoiding reuse, and auditing existing credentials.
比較Base64 vs Hex 編碼：該使用哪一個？
Compare Base64 and Hex encoding across efficiency, readability, use cases, and trade-offs — and learn when to pick each for binary-to-text encoding.
比較CSV vs TSV：該使用哪種分隔符格式？
Compare CSV and TSV across delimiter choice, escaping, compatibility, and use cases — and learn when to pick each for tabular data.
教學如何壓縮圖片而不損失品質
Step-by-step guide to compressing images (JPEG, PNG, WebP) to reduce file size without visible quality loss using a free browser-based tool.
教學如何逐步壓縮 PDF 檔案
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.
教學如何在 HEX、RGB 與 HSL 之間轉換色彩
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.
參考庫
查詢表格與速查表 — JSON 語法、HTTP 狀態、MIME 類型等。
JSON 語法參考
JSON 語法(RFC 8259)的完整參考，包含資料型態、文法規則、範例及常見錯誤。
正規表示式速查表
正規表示式語法的快速參考，包含字元、量詞、錨點、群組及常見模式。
HTTP 狀態碼參考
HTTP 狀態碼的完整參考，包含描述、分類及使用範例。
MIME 類型參考
常見 MIME 類型(網際網路媒體類型)及其副檔名及描述。
HTML 實體參考
常見 HTML 字元實體及其名稱、十進位及十六進位代碼。
IANA 時區參考
IANA 時區識別碼，包含全球 40 個常見時區的 UTC 偏移量及描述。
CSS 命名顏色參考
所有 CSS 命名顏色及其 hex 和 RGB 值。
Unix 時間戳參考
Unix 時間戳參考，包含常見里程碑、值範圍及轉換規則。
隱私設計，人人免費
100% 免費
免註冊、免訂閱、無隱藏費用。所有工具永久免費使用。
隱私設計
大多數工具在您的瀏覽器中本地處理資料。您的檔案絕不離開您的裝置。
快速且瀏覽器內處理
無需下載或安裝。工具透過 Web API、Web Workers 與 WASM 即時執行。
持續擴充的庫
橫跨 17 個分類的 1153+ 個工具，附有指南與參考。