開發工具

瀏覽器端 JSON 格式化/最小化/驗證,提供位元組、深度、token 統計與六格大小判讀矩陣;資料不上傳。

瀏覽器端 Base64 編碼/解碼，支援 UTF-8 多位元組字元、URL-safe 變體與六格大小判讀矩陣；資料不上傳。

URL 百分比編碼雙向轉換，支援 component/full URI 模式、UTF-8 多位元組字元與五格膨脹比判讀矩陣；資料不上傳。

即時編譯 ECMAScript regex pattern，視覺化所有 match 與 capture group，並提供六格密度判讀矩陣；資料不上傳。

HEX/RGB/HSL/HSV/CMYK 五種色彩格式雙向轉換，內建 WCAG 對比度與六格 hue 分區矩陣；瀏覽器端執行。

Unix 時間戳與人類可讀日期雙向轉換，支援秒/毫秒、UTC、ISO 8601 與 RFC 2822；瀏覽器端執行，並提供時間軸六格分區判讀矩陣。

瀏覽器端 CommonMark Markdown 即時預覽,支援標題、清單、連結、程式碼區塊與表格;統計六格內容密度判讀矩陣 (字數、段落、標題、連結、程式碼、表格);資料不上傳。

瀏覽器端純文字差異比對 (Myers diff 簡化版),逐行標示新增/刪除/相同,並提供六格變更密度判讀矩陣 (相同度、純新增、純刪除、混合修改、結構重排、完全不同);資料不上傳。

瀏覽器端 CSV 轉 JSON 結構化陣列(RFC 4180 子集),支援雙引號逸出、自訂分隔字元(逗號/分號/Tab)、型別推斷(數值/布林/null);提供六格列數判讀矩陣 (極小/輕量/標準/中型/倉儲級/超大);資料不上傳。

In-browser SHA-1 / SHA-256 / SHA-384 / SHA-512 hash generation via Web Crypto API (SubtleCrypto), with UTF-8 byte counting and a six-band security matrix grounded in NIST FIPS 180-4 and RFC 6234. Inputs never leave the browser.

Browser-side HTML escape / unescape for the five HTML special characters (< > & " ') with optional non-ASCII full escape, grounded in WHATWG HTML Living Standard §13 and the OWASP HTML Encoding Cheat Sheet. Six-band readout judges escape volume. Inputs never leave the browser.

Browser-side JWT (RFC 7519) decoder — splits header.payload.signature, base64url-decodes (RFC 7515 §2), parses claims, shows exp countdown. Six-band algorithm judgement (none / weak HS256 / RS256 / ES256 / EdDSA / expired) per RFC 8725 BCP and OWASP JWT Cheat Sheet. Tokens never leave the browser.

Browser-side cron expression parser supporting POSIX 5-field (Vixie / IEEE 1003.1-2017) and Quartz 6/7-field syntax, with next-fire prediction, per-day frequency calculation, and a six-band scheduling-load matrix grounded in RFC-conformant cron semantics. Inputs never leave the browser.

Browser-side IPv4 CIDR calculator deriving network address, broadcast, usable host range, subnet mask, wildcard, and host count from any IP/prefix combination, grounded in RFC 4632 (CIDR), RFC 1918 (private space), and RFC 6890 (special-purpose registry). A six-band scale categorizes subnet size from /32 single host to /8 enterprise blocks. Inputs never leave the browser.

Browser-side color palette generator deriving complementary, analogous, triadic, tetradic, and monochromatic schemes from a single hex/HSL seed, grounded in HSL color theory and WCAG 2.2 contrast ratio (AA / AAA). A six-band luminance matrix categorises palette brightness from near-black to near-white. Inputs never leave the browser.

Browser-side cryptographic password generator using Web Crypto API (crypto.getRandomValues), with configurable length, charset (lower/upper/digit/symbol), and Shannon-entropy readout. A six-band entropy matrix grades passwords from disposable to nation-state-resistant, grounded in NIST SP 800-63B and OWASP ASVS 4.0. Inputs never leave the browser.

Browser-side QR code generator producing scalable SVG QR codes with adjustable error-correction level (L/M/Q/H) and module size, grounded in ISO/IEC 18004:2015 (QR Code 2005). A six-band density matrix grades QR complexity from short URLs to dense vCards, with capacity readouts per Reed-Solomon error level. Inputs never leave the browser.

Convert CommonMark Markdown to clean HTML in your browser. 17-layer JsonFormatter gold template, Profile B (violet/purple).

Convert numbers between binary, octal, decimal, and hexadecimal in your browser. 17-layer JsonFormatter gold template, Profile B (violet/purple).

一鍵產生 UUID v4，支援批次產生與格式選擇。

快速產生 Lorem Ipsum 假文段落，支援段落/句子/單字模式與自訂數量

壓縮 HTML/CSS/JavaScript 程式碼，移除空白註解，減少檔案體積

將圖片檔案轉換為 Base64 編碼字串，支援 PNG/JPG/GIF/WebP/SVG

計算 Linux/Unix 檔案權限 chmod 數值，支援符號與數字表示法轉換

HEX 轉 RGB 色彩轉換器 — Profile B 計算器型 YMYL 工具。

HTML 轉 Markdown 轉換器 — Profile B 計算器型 YMYL 工具。