Create a 4K YouTube thumbnail (3840×2160)
Design a thumbnail at YouTube’s recommended 3840×2160 resolution with text, layouts and preview modes — then download without uploading to any server.
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Build a YouTube thumbnail at the exact size you need
4K (3840×2160), mobile-safe 1280×720 under 2 MB, or Shorts 9:16.
Just need to resize an existing image? Use the quick resizer
When to use 4K
Desktop uploads support larger files (up to 50 MB), so 4K thumbnails stay sharp on high-resolution displays and in YouTube’s A/B thumbnail tests.
Frequently asked questions
Do I need 4K for every video?
No. 4K is best when you upload from a computer. Use the mobile-safe preset if you upload from your phone.