Roblox Thumbnail Size: The Complete Guide

Every experience on the Roblox platform is judged, in part, by a strip of pixels roughly 200px wide on the homepage. Get the size wrong and Roblox stretches your art to fit — get it right and you control exactly what players see. Here's the exact spec, why it matters, and how to check your work before you publish.

The short answer

Roblox thumbnails are 16:9, and the ideal upload size is 1920×1080 pixels. If you upload a different aspect ratio — a 4:3 screenshot, a square icon export, anything that isn't 16:9 — Roblox stretches it to fit the 16:9 frame, distorting faces, logos, and text. Never upload 4:3 or square art as a thumbnail.

Keep this table open in another tab while you export. It's easy to nail the pixel dimensions and still ship a file that's the wrong ratio because your canvas had guides or padding baked in — always check the final export, not just the canvas you drew on.

Safe zones: where Roblox UI covers your art

The homepage doesn't show your thumbnail edge-to-edge. A player-count overlay sits on top of the bottom strip of every card, and on some layouts that strip covers more than you'd expect. Anything essential — your subject, a title treatment, a logo — needs to live in the centered safe zone, not down in that bottom band.

This is the single most common mistake in Roblox thumbnails: a great character pose or establishing shot with the key detail cropped by the player count. Compose with the overlay in mind from the first draft rather than fixing it after the fact.

Why 1920×1080 when cards render tiny

If the homepage only shows a ~200px-wide card, why bother with a full 1920×1080 upload? Two reasons. First, Roblox itself serves multiple crops of your source image — including a roughly 768×432 version — and it generates those crops from whatever you uploaded. Upload low-res source art and every downstream crop, including the ones shown on higher-density displays, inherits that softness. Upload full resolution and Roblox's downscale stays sharp at every size it needs.

Second, and just as important: what looks sharp and legible in your design tool at 100% zoom is not what a player sees. You need to judge your thumbnail at the size it's actually shown — a small card, at a glance, next to a dozen competitors — not zoomed into your canvas.

That gap between "looks good at full size" and "reads at card size" is where most thumbnails quietly fail. Fine detail, thin text, and busy backgrounds all disappear at ~200px wide, even though they look perfectly fine in your editor. The fix isn't to design at a smaller canvas — you still want the full 1920×1080 source for Roblox's downscale to stay sharp — it's to zoom your own view out and check legibility at the size players will actually encounter, before you spend an upload slot finding out the hard way.

Video thumbnails

Roblox also allows short video thumbnails alongside static images, with its own rules layered on top of the size spec above:

• You get 3 video uploads per month.
• Videos are reviewed for authenticity before they go live.
• Video thumbnails are not shown on Xbox, PlayStation, or VR — those surfaces fall back to your static image, so don't rely on video alone.
• No voice-over or lyrics in the audio track.
• No promotional text overlays, like "50% off" or similar sale callouts baked into the frame.

Treat video as a bonus channel for players on desktop and mobile, with a strong static thumbnail as the baseline every platform actually sees.

Test multiple thumbnails

Roblox's own thumbnail personalization system runs 2 to 5 active thumbnails per experience and shows different ones to different players, then favors whichever performs best. In Roblox's own testing, this averaged a +8.5% lift in qualified play-through rate, with some individual experiences seeing gains as high as +50%.

The practical takeaway: don't ship one thumbnail and move on. Prepare 2–3 genuinely different candidates — different compositions, different focal subjects, different color treatments — and keep the underperforming ones active rather than deleting them. Personalization needs that variation to keep exploring; a single "safe" thumbnail leaves that lift on the table.

It's tempting to pick a single "winner" the moment one candidate looks stronger and archive the rest, but that's exactly what starves the system of the variation it needs. Roblox's own results show the gain compounds over time as the personalization model learns which thumbnail works for which player segment — a game showing +50% didn't get there from one lucky upload, it got there by leaving several real options in rotation long enough for the system to sort them.

If you're building out a full set of candidates, see how to make a Roblox thumbnail for a step-by-step workflow, and check the Roblox game icon size guide so your icon and thumbnail match at every size Roblox renders them.

FAQ

What size is a Roblox thumbnail?

1920×1080 pixels at a 16:9 aspect ratio. Roblox stretches any other ratio to fit 16:9, so avoid uploading 4:3 or square images as your thumbnail.

What file types does Roblox accept for thumbnails?

.jpg, .gif, .png, .tga, and .bmp, each under 3MB. You can have up to 10 images and videos total per experience.

How do I see my thumbnail before publishing?

Upload it to qptr.io and preview it directly on a simulated Roblox games homepage, next to realistic neighboring experiences, at the actual size players will see it — before you spend an upload slot finding out.