軽 Karu Tools

Tools

Developer and data tools

Utilities for JSON, URLs, Base64, UUIDs, HTML escaping, password generation, and quick data checks during development.

Featured

Check JSON and URLs

Format API responses, validate JSON, and convert URL parameter values while keeping input local.

Generate identifiers and secrets

Generate UUIDs, random strings, and passwords in the browser for test data and setup work.

All tools

URL converter

URL Encoder / Decoder

Encode text for URLs and decode percent-encoded strings locally in your browser.

Base64 converter

Base64 Encoder / Decoder

Encode text to Base64 and decode Base64 strings back into UTF-8 text locally in your browser.

JSON formatter

JSON Formatter / Minifier

Format and minify JSON in your browser, with parse errors shown when the input is invalid.

UUID

UUID Generator

Generate UUID v4, v5, and v7 values in your browser.

Password

Password / Random String Generator

Instantly generate strong, secure passwords or random strings directly in your browser. Customize the length and character types as needed.

HTML Entity

HTML Entity Encoder / Decoder

Easily encode special characters into HTML entities to safely display code snippets, or decode HTML entities back to their original characters.