Before you start
You don't need Photoshop to make a good thumbnail. A browser-based thumbnail maker with a template library will get you most of the way there — the steps below work the same whether you're using a drag-and-drop editor or a full design tool.
The 8 steps
Pick a template pre-sized to YouTube's spec — most thumbnail makers default to this — so nothing gets cropped after upload.
A solid color, a soft gradient, or a still frame from your video all work. Keep it simple so nothing competes with your subject.
Remove the background from a photo of yourself, a product, or a screenshot so it sits cleanly on top of your background layer.
Three to five words, in a heavy weight. Anything longer stops being readable once the thumbnail shrinks to phone size.
Light text on a dark background, or dark on light. Avoid placing text over busy, high-detail parts of the image.
Shrink your preview to roughly 120px wide — about how it appears in search results and Suggested videos — and confirm it still reads clearly.
Save as a JPG (or PNG) at 1280×720, and confirm the file is under 2MB before upload.
Use YouTube's built-in thumbnail testing or a dedicated testing tool to compare variants against real traffic, then keep the winner.
Tools to use
For steps 1–4, browse Thumbnail Makers for templates or AI Thumbnail Generators to skip straight to a concept. For step 6, run your export through the Thumbnail Analyzer to check contrast and legibility automatically. For step 8, see Thumbnail Testing Tools.