What is the standard thumbnail size?

It depends on whether the video is horizontal or vertical. Horizontal video (YouTube long-form, Facebook) uses 1280 × 720 at 16:9. Vertical video (Shorts, TikTok, Instagram Reels) uses 1080 × 1920 at 9:16. Those two sizes cover almost everything you'll upload.

What aspect ratio should a thumbnail be?

Match the video. Horizontal video uses 16:9, vertical video uses 9:16, and a few square placements (like YouTube podcast playlists or the Instagram grid) use 1:1. A thumbnail that doesn't match its video gets cropped or shown with bars.

Is one thumbnail size fine for every platform?

No. A 16:9 YouTube thumbnail gets cropped or letterboxed on TikTok, Shorts, and Reels, which are all vertical. Make a horizontal version (1280 × 720) and a vertical version (1080 × 1920) and you're covered.

Thumbnail sizes for every platform (2026): the quick chart

One chart with the exact thumbnail and cover size for YouTube, Shorts, TikTok, Instagram, and Facebook in 2026, plus a link to the full guide for each platform.

2026-06-09 2 min read ThumbnailsGuides

You only need two numbers for most of this: **1280 × 720** for horizontal video and **1080 × 1920** for vertical. The details differ by platform, though. YouTube just moved to 4K, TikTok hides part of your cover behind its buttons, Instagram crops to a square in the grid. Here's the chart, then a link to the full guide for whichever platform you're on.

Quick reference: thumbnail sizes by platform

|---|---|---|---|

| YouTube Shorts | 1080 × 1920 | 9:16 | Custom thumbnails supported; matches the vertical frame |

| TikTok cover | 1080 × 1920 | 9:16 | Keep text in the middle third |

| Instagram Reels cover | 1080 × 1920 | 9:16 | Profile grid crops to 1:1, so center your subject |

| Facebook video | 1200 × 675 | 16:9 | Facebook Reels use 1080 × 1920 (9:16) |

The full guide for each platform

Every platform has one quirk worth knowing before you export. The deep dives:

**[YouTube thumbnail size](/blog/youtube-thumbnail-size)**: 1280 × 720, the 2026 jump to 4K, file limits, and why it still has to read at 320 × 180.

**[YouTube Shorts thumbnail size](/blog/youtube-shorts-thumbnail-size)**: 1080 × 1920, how to add a custom Shorts thumbnail, and why you shouldn't reuse the 16:9 one.

**[TikTok cover size](/blog/tiktok-thumbnail-size)**: 1080 × 1920, and the safe zone that keeps your text out from under the caption and buttons.

**[Instagram Reels cover size](/blog/instagram-reels-cover-size)**: 1080 × 1920, plus the 1:1 grid crop that eats covers designed full-frame.

The rule that beats the chart

Getting the size right just stops your thumbnail from looking broken. It doesn't make anyone click. The thing that does: the thumbnail has to read at a glance, at a tiny size, against everything else in the feed. One clear subject, a few big words, strong contrast. We get into that in [the psychology of a clickable thumbnail](/blog/youtube-thumbnail-psychology) and why a [high click-through rate isn't always the goal](/blog/ctr-optimization-guide).