Duration Badge Collision Safe-Zones
See exactly where the bottom-right timestamp pill renders on desktop and mobile feeds so focal points stay visible.
YOUTUBE CREATOR TOOLS · RUNS LOCALLY
YouTube thumbnail previewer
Test your YouTube video thumbnails against real desktop, mobile, and sidebar layouts. Catch timecode badge collisions and title truncation before publishing.
FREE · NO ACCOUNT · ZERO SERVER UPLOADS · LIVE PREVIEW
Video title54/60 chars
1280 x 720 (16:9)
12:45
SAFE ZONE
C
How to Build a 100k Audience in 30 Days (Step by Step)
Creator Studio
184K views • 3 days ago
WHY THIS ONE
Catch click-through bottlenecks before your video goes live
YouTube thumbnails lose up to 18% CTR when critical visual hooks or faces are obscured by duration badges or mobile edge cutoffs.
Multi-Device Feed Context
Switch between Desktop 3-column feed, Mobile portrait stack, and Sidebar Up-Next cards.
Dark & Light Mode Testing
Verify thumbnail border contrast and title readability in both YouTube dark theme and light theme.
PAST THE PAGE
Generate high-CTR thumbnail assets with AI
PrismPoster Image Studio creates cinematic, high-contrast imagery designed specifically for high click-through rates.
- Generate the image at 16:9, then check it here before you upload.
- Render it at 4K when the thumbnail needs the extra detail.
- In many countries a new account gets 200 free starter credits, no card. Unused starter credits expire 24 hours after they are granted.
This previewer tool is free with zero upload.
Explore Image StudioQUESTIONS
YouTube thumbnails, answered
Is the thumbnail previewer free?
Yes, with no account. The image never leaves your browser; the previews are drawn on your device.
What resolution should a YouTube thumbnail be?
1280×720 pixels at 16:9, under 2 MB, as JPG, PNG or WebP. Smaller images are upscaled and look soft in the desktop feed; other ratios get letterboxed.
What are the safe zones on a thumbnail?
The parts YouTube never covers. The duration badge sits bottom-right, the “watched” progress bar runs along the bottom, and on hover a preview can replace the image entirely — keep faces and text away from those edges.
Why does my title get cut off?
The mobile feed shows roughly 60 characters over two lines and the sidebar even fewer, so a 100-character title loses its ending exactly where the hook usually is. Put the payoff in the first 40 characters.
Should I check both dark and light mode?
Yes. A dark thumbnail with no border disappears into YouTube’s dark theme, and a white one bleeds into the light theme. Toggle both here and check that the edges still read.
Make the picture itself
Describe it in the Image Studio and generate it in the shape the post needs.
200 free starter credits in many countries · No card · Unused starter credits expire after 24 hours
No subscription: credit packs from €3.99, paid once. The credits you buy never expire.
Start creating freeReady to build high-CTR videos?From concept to export.
Create thumbnail backdrops and cinematic scenes in the studio, then check them here before you upload.