Add to ChromeGuides
How to change the look of ChatGPT, Claude and Gemini. Each guide covers what the sites can do on their own first, then what an extension adds.
How to change the ChatGPT theme
Switch ChatGPT between light, dark and system, change the accent colour and contrast, and go further with full custom themes. Updated October 2026.
How to change the font in ChatGPT
ChatGPT has no font setting. Here is how to change the text size with zoom, and how to switch the typeface to serif, mono, pixel or typewriter with an extension.
ChatGPT dark mode too dark? Here's how to soften it
ChatGPT's dark mode moved to a near-black background and many people find it harsh. What the built-in settings can do, and how to get a softer dark theme.
How to change the Claude theme
Turn on Claude dark mode, change the chat font, and go further with custom themes for claude.ai. Covers Claude in the browser, not Claude Code.
How to change the font in Claude
Claude offers three chat fonts. Here's where to find them, how to change the text size, and how to use more fonts on claude.ai.
How to hide buttons and sidebar items in ChatGPT
ChatGPT can only collapse its sidebar. Here's how to hide single buttons and links you never use, like Upgrade or Explore GPTs, by pointing at them.
How to hide the Claude sidebar, or just the parts you don't use
Claude can't turn its sidebar off, only close it. Here's how to close it, and how to hide single links and buttons on claude.ai by pointing at them.