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Validate, pretty-print or minify JSON with error line:col reporting

Convert Unix timestamps to dates, auto-detect seconds/milliseconds

Convert text to/from Base64, handles Unicode correctly, URL-safe mode

URL encode/decode supporting both component and full URI modes

Online regex tester with group highlighting and match details

Batch generate UUID v4 unique IDs using cryptographic random

Chinois与 Unicode 转义序列互转，处理配置Fichier中的转义Caractère

Decode JWT tokens to view header, payload, signature, and expiry

Texte与十六Base（UTF-8 字节）互转

Batch find/replace with regex, supports capture groups and all flags

Encode/decode HTML entities to prevent tag parsing

Quick reference table of common HTTP status codes with search

Remove comments and excess whitespace from JS/CSS/HTML