The Logic Behind the Hack
YouTube stores your player preferences (like volume, quality, and view mode) in browser cookies. By manually setting the wide cookie to 1, we tell YouTube’s servers that our default preference is always “Theater Mode”.
Step-by-Step Instructions:
- Go to YouTube.com
- Open the Developer Tools by pressing
F12orCtrl+Shift+I(Cmd+Option+I on Mac). - Click on the Console tab at the top.
- Copy and paste the following code, then press Enter:
document.cookie = 'wide=1; expires=' + new Date('3099-01-01').toUTCString() + '; path=/; domain=.youtube.com; Secure';
Note: We set the expiration date to the year 3099, so you’ll basically never have to do this again!
Why is this better than extensions?
- Privacy: No third-party code watching your browsing habits.
- Performance: Extensions consume RAM; this native cookie takes zero resources.
- Reliability: It uses YouTube’s own built-in logic.
💡 Pro Tips for Power Users
1. How to Undo: If you ever want to go back to the default small player, just paste the same code but change
wide=1towide=0.2. Cross-Browser: This works on Chrome, Firefox, Edge, and Safari. As long as you are logged into your browser profile and cookies aren’t cleared, it stays active.
⚠️ Troubleshooting: If it doesn’t work immediately, refresh the page. Ensure you are on the main YouTube domain and not an embedded player on another site.
Enjoy your cinematic experience without the extra clicks! 🎬

how does one undo this in chrome on macos sonoma?
It is so easy Jeff. Open youtube and press F12 or Right-click -> Inspect
That will open the Inspect window. Go to Application tab and click to Cookies section. Choose youtube.com cookies by clicking on it. You will see the row named “wide”. Just remove that row. So you will get rid of that.