にゃんこツール: A Cat-Branded Japanese Browser Toolbox

Field notes

にゃんこツール groups browser-based utilities into text and code categories, with a search control and light/dark/system display options. The visible catalog covers 15 named tools, including Japanese full-width/half-width and hiragana/katakana conversion alongside JSON, YAML, CSV, Markdown, encoding, hashing, QR, color, UUID, password, and timestamp functions. The page states that data is not sent to a server, though the extract does not independently verify that behavior.