Free developer tools
Format, decode, test, and inspect payloads in your browser. All operations execute locally in memory without transmitting tokens or code over the network. All 6 developer tools are completely free.
JSON Formatter & Validator
Format JSON payloads with 2-space, 4-space, or tab indentation. Includes minification and syntax validation with line and column error indicators.
Base64 Encoder / Decoder
Convert standard UTF-8 text to Base64 and decode Base64 strings. Includes support for URL-safe Base64 and Unicode characters.
URL Encoder / Decoder
Convert strings into percent-encoded URI components or decode percent-encoded URL query parameters back into readable text.
JWT Decoder
Inspect JSON Web Token claims, header algorithms, and expiration status in your browser. No tokens are sent over the network.
Regex Tester
Test JavaScript regular expression patterns against test strings. Displays live match counts, match indices, and named capture groups.
Diff Checker
Compare original and modified text files or code snippets. Highlights additions, deletions, and unchanged lines with line numbers.