Private by default
Images used in the size tool stay in your browser. Your character and generated results are stored privately for up to 24 hours.
Thumbize
Roblox thumbnail generator for your real character.
Load your current Roblox avatar, choose an AI background, then adjust the title and character placement. Export a game thumbnail, square icon or YouTube cover without asking AI to redraw your character.
Open the workspaceFree local size tool also available below
Output presets
Ready for the next step
Game thumbnail
16:9
Game icon
Square
YouTube thumbnail
16:9
Create and adjust your thumbnail
Turn your Roblox character into a thumbnail with an AI background. Add your title, choose a text style and adjust the character placement to make it yours.
AI generation is temporarily unavailable. Please try again later, or use the free image resizer.
The composed preview appears after a background is ready.
1920 × 1080 PNG. Adjust the title, style and placement without using another background credit.
Make it your own
Change the title, text style and character placement to match your idea. Keep editing without using another background credit.
Your image, the right size
Choose center crop or contain, then download true PNG files at three exact sizes.
Create or resize
Start with your character or an image you already have
Create a thumbnail with your Roblox character, an AI background and your own title. Already have an image? Crop and resize it for free, with no sign-in or upload.
Resize an image for free