Youtube Theme Engine

Youtube Theme Engine allows you to tweak almost every aspect of the YouTube UI including colors, buttons, text, media, and more.

24 built-in dark, light, and high-contrast themes 18-channel custom palette editor with live color preview Contrast checker for readable text Automatic switching by system theme or a daily schedule Different themes per page (Home, Watch, Shorts, Search, Music, and more) Share and import palettes with theme codes

Layout & Typography

18 fonts plus text size, line height, and weight Content width, video grid columns and spacing, sidebar width Stacked Watch layout with related videos below the player Rounded thumbnails, buttons, and panels, five avatar shapes Custom scrollbar colors and width

Media & Player

Change thumbnail and video brightness, contrast, saturation, grayscale, opacity, etc. Themed progress bar with adjustable thickness Rounded player corners, theater width, cinema glow Hide endscreens, watermarks, info cards, and annotations

Focus (40 toggles)

Zen mode for distraction-free watching Hide Shorts, Playables, comments, related videos, live chat, home feed Hide ads surfaces, merch shelves, and members-only cards Hide view counts, upload dates, likes, badges, and thumbnail overlays Hide completed or live videos, community posts, mixes, and playlists