Boss encounter
Original sample · Example artwork
FREE ROBLOX CREATOR TOOL
Test your Roblox thumbnail in a discovery grid
Preview your image at desktop and mobile card sizes, check its 16:9 crop, and keep it private. The image stays in your browser from selection through preview.
Use a PNG, JPG, or WEBP up to 10 MB. A 16:9 image near 1920 × 1080 pixels is recommended.
Choose a thumbnail to preview
Your image stays in this browser. It is never uploaded to ClickCrit.
For the sharpest result, use a 16:9 image near 1920 × 1080 pixels.
ROBLOX-STYLE GRID PREVIEW
See your image at thumbnail size
Rare reward
Original sample · Example artwork
Close escape
Original sample · Example artwork
World reveal
Original sample · Example artwork
Speed challenge
Original sample · Example artwork
Pet collection
Original sample · Example artwork
Original sample cards show how thumbnails can read in a discovery grid.
Check the canvas before you publish
Roblox thumbnails use a 16:9 display ratio, with 1920 × 1080 pixels recommended for high-resolution display. A discovery-grid preview can help you notice a crop or focal point that is hard to see at full size. It cannot tell you which creative will earn more clicks or qualified plays.
Need the platform requirements? Read the Roblox thumbnail size guide. When you are ready to explore alternatives, create a four-image thumbnail pack.
Roblox thumbnail tester questions
Does this Roblox thumbnail tester upload my image?
No. The image is read and previewed in your browser. ClickCrit does not upload or store the selected file.
What image formats and size are supported?
Choose a PNG, JPG, or WEBP image that is 10 MB or smaller. The browser must be able to decode the image.
What size should a Roblox thumbnail be?
Roblox recommends a 16:9 image and identifies 1920 × 1080 pixels as the ideal resolution. This tester reports your image dimensions and shows how it crops into a 16:9 card.
Can this tester predict CTR or QPTR?
No. It only helps you inspect crop, ratio, and small-card readability before publishing. It does not estimate or predict CTR or QPTR.