local-only

Thumbnail Maker

Make YouTube/social thumbnails at exact sizes.

🔒 local memory only
Initializing Thumbnail Maker in local browser environment…

How to use Thumbnail Maker

  1. Upload an image to serve as your background canvas.
  2. Select a platform preset: YouTube (1280×720), Reels/Shorts (1080×1920), Instagram (1080×1080), or Twitter Header (1500×500).
  3. Choose your image fit mode: Cover (fill and crop) or Contain (fit whole image).
  4. Pick a background color and download your high-resolution thumbnail PNG.

Why use this local-first tool?

  • Accurate pixel dimensions for all major social media platforms.
  • Smart cover/contain centering calculation.
  • Export crisp 24-bit PNG files.

Frequently Asked Questions

What is the recommended size for YouTube thumbnails?

YouTube recommends 1280×720 pixels with a minimum width of 640 pixels and 16:9 aspect ratio.

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