ThumbBlitz

Yes. Every feature — all styles, stickers and export sizes — is free with no paid tier, no export limit and no credit card. The site does not sell anything.

No. Every export — 1920×1080, 1280×720 or 512×512 — downloads as a clean PNG with no watermark, logo or badge stamped on it.

Yes, entirely. There is no paid tier, no export limit and no credit card. The site does not sell anything.

No. The file is read with a local browser API and drawn onto an on-device canvas. It is never sent anywhere, which is also what the privacy page states.

No. It is a layout editor: you bring the screenshot, it handles typography and stickers. Nothing is synthesised, so the result is always what you saw. That is the main difference between this Roblox thumbnail maker and the AI generators that produce an invented scene nobody captured.

1920×1080 by default — the official game thumbnail specification. You can switch to 1280×720 for YouTube thumbnails or 512×512 for a game icon without recomposing anything.

PNG, JPG and WEBP all work. Larger screenshots are scaled to fit the canvas, so a 4K capture is fine.

No sign-up exists in the product at all. Open the page, make the thumbnail, download it.

The one you will actually finish with. This one has no account step, no watermark, no export limit and no AI generation — you upload the screenshot, set the headline, export 1920×1080 in about a minute. Paid generators are worth it only if you need background removal or upscaling, neither of which this tool claims to do.

Yes, and this is the normal case. Roblox Studio is for building the place; the thumbnail is just an image file uploaded through Creator Dashboard. Everything here happens in a browser tab, so Studio never needs to be open.