Security & Privacy安全与隐私
JWT Decoder & FormatterJWT 令牌解码与格式化
Decode JSON Web Tokens (JWT) into Header and Payload, inspect expiration timestamps, and verify claims safely with zero data upload.解析 JWT 令牌 Header 与 Payload，快速检验过期时间与 Claims 字段。
Hash & HMAC Generator (Text & File)哈希与 HMAC 生成器 (文本 / 文件)
MD5, SHA-1/224/256/384/512 and SHA-3 digests of text or dropped files, plus HMAC-SHA256/384/512 — all locally in your browser.文本或拖入文件计算 MD5、SHA-1/224/256/384/512、SHA-3 摘要，并支持 HMAC-SHA256/384/512，全程本地运算。
Browser & Hardware Info浏览器与硬件信息
Read what the browser knows about this machine — CPU cores, memory, GPU, screen, network, codec support — and copy it as a report. Nothing is sent anywhere; the page just prints its own APIs.读取浏览器可知的本机信息——CPU 核数、内存、GPU、屏幕、网络、解码支持——一键生成可复制报告。纯本地读取，不向任何地方发送。
IP Subnet & CIDR Calculator (IPv4 / IPv6)IPv4 / IPv6 子网掩码与 CIDR 计算器
Compute network address, netmask, broadcast, host range from IPv4/CIDR — plus full IPv6 breakdowns with :: expansion and 128-bit prefix math.IPv4/CDIR 网段计算网络地址、子网掩码、广播地址与可用主机范围，并支持 IPv6 网段的 :: 展开、128 位前缀与地址总数计算。
Password Generator强密码生成器
Generate strong random passwords with crypto randomness and ambiguous character filtering.高强度随机密码生成器，采用密码学随机数，支持字符集筛选与易混淆字符排除。