AI Chat Tuner

Adjust chat width, font size, font family and line height for Claude, ChatGPT and Gemini in one place

Using more than one AI chat tool? Skip installing a separate widescreen or font extension for every site — AI Chat Tuner adjusts Claude, ChatGPT and Gemini from a single popup. Features - Chat width — px (600–2000) or % of the screen (40–100) - Text zoom (70–150%) — body, headings, code and tables scale together, like browser zoom - Font family — presets (Pretendard, Noto Sans KR, Malgun Gothic, …) or custom - Line height (1.2–2.2) - One common setting for all three sites, with per-site overrides - Per-option toggles — only enabled options are applied - Applies instantly, no reload; settings sync via your Chrome account - 7 languages (한국어, English, 日本語, 简体中文, Español, Français, Deutsch) Privacy: this extension collects no data. Settings are stored only in Chrome's sync storage. Claude, ChatGPT and Gemini are trademarks of their respective owners. This is an unofficial tool and is not affiliated with Anthropic, OpenAI or Google.