ChatGPT dark mode for long sessions on bad-head days

Updated 2026-11-02

Quick answerIn ChatGPT, click your profile, open Settings, then General, and set Appearance to System, Light or Dark. OpenAI says the choice is saved per device or browser, so set it on each one. For long answers, increasing browser zoom and line spacing can make the text easier to read.

Web

  1. Click your profile icon.
  2. Open Settings > General.
  3. Under Appearance choose Dark or System.

Easier reading

  1. Use Chrome zoom for bigger text.
  2. Chrome's Reading mode lets you adjust line and letter spacing on many pages.

Good to know

  • Dark mode cuts how much light a mostly white page sends out; studies on fatigue are mixed.
  • Migraine Mode adds what the site lacks: dimming, a soft-green tint, smart dark mode, frozen GIFs and blocked autoplay, all with one switch.

FAQ

Does ChatGPT dark mode sync across devices?

No. OpenAI describes the appearance setting as per device.

Can I make the text bigger?

Yes, with browser zoom (Ctrl/Cmd and +).

Sources

  • OpenAI Help Center: Updating your visual experience on ChatGPT. Link
  • Google Chrome Help: Change text, image and video sizes (zoom). Link
  • Google Chrome Help: Use Reading mode in the side panel. Link

Not a medical device and not medical advice. Migraine Mode is a screen-comfort tool: it does not diagnose, treat, cure or prevent migraine or any other condition, and it does not replace a doctor. Its settings are based on studies of light, colour, flicker, patterns and motion; the extension itself has not been clinically tested. When to see a doctor.