Free tools
Genuinely useful utilities for debugging — not keyword bait.
JSON Formatter
Pretty-print and validate JSON in the browser.
JSON Validator
Check whether a string is valid JSON.
JWT Decoder
Decode JWT header and payload claims.
Base64 Encoder
Encode and decode Base64 strings.
URL Encoder
Encode and decode URL components.
QR Generator
Generate a QR code from text or a URL.
HTML to Markdown
Convert HTML snippets to Markdown.
Timestamp Converter
Convert Unix timestamps to human-readable dates.
Regex Tester
Test regular expressions against sample text.
API Response Formatter
Pretty-print API JSON responses for debugging.