Skip to content
Feather Logo

Feather Documentation

Native markdown editor for Windows

Back to Support

Themes & Customization

App Theme

Feather supports three app-wide theme modes:

  • System default — follows your Windows light/dark setting
  • Light
  • Dark

On Windows 11, the app uses the Mica backdrop for a translucent material effect behind the window.

To change the app theme:

  1. Open Settings (gear icon or Ctrl+,)
  2. Go to Appearance
  3. Select your preferred theme

Preview Themes

The preview theme controls how your markdown renders in the preview pane. It is independent of the app theme.

Preview Theme Mode

Choose how the preview theme responds to light and dark:

  • Follow app — matches the current app theme
  • Always light — preview always uses the light variant
  • Always dark — preview always uses the dark variant

Built-in Themes

Feather includes 9 preview themes:

Theme Description
Default Clean, balanced styling
GitHub Mimics GitHub's markdown rendering
Academic Serif fonts with a scholarly feel
Newsletter Editorial, magazine-style layout
Minimal Stripped-down, distraction-free
Night Owl Dark theme with warm colors
Catppuccin Pastel dark theme
Windows 98 Retro nostalgic look
Windows XP Classic Windows styling

Each theme includes matching colors for highlight marks (==text==) and Mermaid diagrams.

Custom CSS

You can replace the built-in preview stylesheet with your own CSS file.

  1. Open Settings > Preview
  2. Under Custom CSS, select your .css file
  3. The preview pane will immediately use your stylesheet

Your custom CSS controls all preview rendering: headings, paragraphs, code blocks, tables, blockquotes, and more. To revert to the built-in themes, remove the custom CSS file from settings.

Editor Font

  • Open Settings > Editor to change the editing font
  • A searchable font picker lists all installed system fonts
  • Default font: Cascadia Code
  • Monospace fonts are recommended for markdown editing

Preview Font

  • Optionally override the default font used by the preview theme
  • Set in Settings > Preview
  • Uses the same system font picker as the editor font setting

Font Size

  • Adjustable from 12pt to 24pt via a slider in Settings
  • Applies to the editor pane
  • Preview font size follows the selected preview theme