Fast, private developer tools in your browser
Format JSON, decode JWT, convert Base64, generate UUIDs, test regex, and more.
Search toolsJSON Formatter
FormattersFormat, validate, minify, upload, copy, and download JSON.
Base64 Tool
EncodersEncode and decode Base64 text with UTF-8 support.
JWT Decoder
SecurityDecode JWT headers and payloads, inspect expiry, and learn what is not verified.
UUID Generator
GeneratorsGenerate one or many UUID v4 values.
Password Generator
SecurityGenerate secure random passwords with length and character options.
Popular tools
JSON Formatter
FormattersFormat, validate, minify, upload, copy, and download JSON.
Base64 Tool
EncodersEncode and decode Base64 text with UTF-8 support.
JWT Decoder
SecurityDecode JWT headers and payloads, inspect expiry, and learn what is not verified.
UUID Generator
GeneratorsGenerate one or many UUID v4 values.
Password Generator
SecurityGenerate secure random passwords with length and character options.
Your data never leaves your browser
DevBox Tools is designed for day-to-day development work where snippets may contain tokens, API keys, JWTs, payloads, and configuration data. Sensitive tool processing runs client-side, so formatting, decoding, conversion, hashing, and generation happen locally without uploading your input to a backend.