YouTube Thumbnail Preview
Free YouTube thumbnail preview — see how your thumbnail and title look at desktop, mobile and sidebar sizes before you publish. No signup.
About the YouTube Thumbnail Preview
A thumbnail that looks great full-size can fall apart when it is shrunk to a search result or sidebar suggestion. This free YouTube thumbnail preview shows your image and title at the common display sizes — desktop grid, mobile app and sidebar — so you can check readability before you upload.
Add your thumbnail and an optional title, and the tool renders realistic mock previews side by side. Everything happens in your browser with no signup, so your image stays private while you fine-tune it for maximum clicks.
How to Use the YouTube Thumbnail Preview
- 1Upload your thumbnail image.
- 2Enter an optional video title to preview with it.
- 3Review the desktop, mobile and sidebar mockups.
- 4Refine your thumbnail until it reads well at every size.
Frequently Asked Questions
Why preview a thumbnail at different sizes?
Viewers see thumbnails at very different scales across YouTube. Text and details that are clear at full size can become unreadable in a small sidebar or mobile view, so previewing helps you fix that early.
What thumbnail size should I use?
YouTube recommends 1280×720 pixels with a 16:9 aspect ratio. Upload at that size and the tool shows how it scales down across placements.
Does it upload to YouTube?
No. This is a preview and mockup tool only. It never connects to your YouTube account or uploads anything — it simply renders how the thumbnail would look.
Is my image kept private?
Yes. The preview is rendered in your browser, so your thumbnail is never sent to a server.