Preview on PC, Mobile & Dark Mode
See exactly how your thumbnail looks on YouTube Home, Sidebar, and Mobile feeds in both light and dark mode.
YouTube Thumbnail Preview
Check how your thumbnail looks on PC Home, Sidebar, and Mobile before uploading. Compare light and dark mode side by side.
Select Thumbnail
or drag and drop an image here
Features
Why use this tool?
Realistic YouTube UI Simulation
Enter your video title, channel name, and view count to recreate the exact YouTube layout before uploading.
100% Local Processing · Completely Free
Your images never leave your browser. No uploads, no sign-up required — just free, private thumbnail previews.
How to Use
Get started in 4 simple steps
1
Upload Your Thumbnail
Select or drag and drop the YouTube thumbnail image you want to preview.
2
Add Title & Channel Info
Enter your video title, channel name, and view count for a more realistic preview.
3
Switch Views & Modes
Toggle between PC Home, PC Sidebar, and Mobile views. Switch between light and dark mode to compare.
4
Save Your Preview
Download the preview as a screenshot to share with your team or compare designs.
Frequently Asked Questions
Find answers to common questions
YouTube officially recommends 1280x720 pixels at a 16:9 aspect ratio. The minimum width is 640px, and file size should be under 2MB. This tool lets you upload any size image and preview it exactly as it would appear on YouTube.
A large portion of YouTube users browse in dark mode. A thumbnail that pops on a white background might blend in on dark, or vice versa. Checking both modes before uploading helps you design thumbnails that attract clicks everywhere.
No. All processing happens locally in your browser. Images are never sent to or stored on any server, so your privacy is fully protected.
YouTube displays thumbnails at different sizes depending on the device. They appear large on the PC Home feed, small in the Sidebar, and full-width on mobile. Text readability and visual impact change across each view, which is why previewing matters.