🔐 编码与哈希Encode & Hash
计算文本的 MD5、SHA-1、SHA-256、SHA-512 摘要，或进行 Base64、URL、HTML 编解码，ROT13 与 Unicode 码点转换。SHA 系列使用浏览器内置加密接口。Compute MD5, SHA-1/256/512 digests, or Base64 / URL / HTML encode-decode, ROT13 and Unicode points. SHA uses the browser’s built-in crypto.
① 输入文本① Input
② 操作② Operation
③ 结果③ Result
使用说明How to use
- 输入要编码/哈希的文本Enter text to encode/hash
- 选择算法：MD5/SHA 家族/Base64/URL 编解码等Pick an algorithm: MD5/SHA family/Base64/URL
- 查看结果，可复制或下载Review, copy or download
示例：abc → MD5 900150…f72Example: abc → MD5 900150…f72
全程在你的浏览器本地完成，文本不会上传服务器。Runs entirely in your browser; your text is never uploaded.
选择算法后结果实时更新。MD5 由本地内置的轻量脚本计算，全程离线；SHA 系列（含 SHA-384）使用浏览器加密接口，需在 https 或 localhost 下使用；CRC32 纯本地计算；HMAC 为带密钥的 SHA-256 摘要（同样需安全环境）。Base64/URL/HTML/ROT13 全程离线。Results update live. MD5 uses a tiny built-in script, fully offline; SHA (incl. SHA-384) uses the browser crypto (needs https or localhost); CRC32 is pure local; HMAC is a keyed SHA-256 digest (also needs a secure context). Base64/URL/HTML/ROT13 work fully offline.
📚 什么是哈希（散列）？📚 What is a hash?
哈希把任意长度的输入映射为固定长度的「指纹」（如 SHA-256 恒为 64 位十六进制）。三个核心性质：① **单向**——由指纹无法反推原文；② **确定性**——同一输入永远得到同一指纹；③ **雪崩效应**——原文改一个字符，指纹面目全非。因此哈希常用于：校验文件完整性（下载后对比哈希）、存密码（只存哈希不存明文）、去重与索引。A hash maps arbitrary-length input to a fixed-length “fingerprint” (SHA-256 is always 64 hex chars). Three core properties: ① one-way — you can’t recover the input from the fingerprint; ② deterministic — same input always gives the same fingerprint; ③ avalanche — changing one char changes the fingerprint completely. Hence hashes are used for file-integrity checks, password storage (store the hash, not the plaintext), dedup and indexing.
算法选用：**MD5（128 bit）与 SHA-1 已不推荐**用于安全场景（碰撞攻击可行），但用于校验/去重仍常见；**SHA-256/384/512** 是当前主流安全散列；**CRC32** 是快速校验和（检测随机损坏、非对抗场景）；**HMAC** 是带密钥的认证码——需要「防篡改」时用 HMAC 而非裸哈希（例如 API 签名）。本工具的「全部算法」模式可一键对比六种结果。Choosing algorithms: MD5 (128-bit) and SHA-1 are no longer recommended for security (collision attacks feasible), but remain common for checksums/dedup; SHA-256/384/512 are the current mainstream secure hashes; CRC32 is a fast checksum (detects random corruption, not adversarial tampering); HMAC is a keyed authentication code — use it when tamper-resistance matters (e.g. API signatures), not a bare hash. The “All algorithms” mode compares all six at once.