YouTube Shorts Specs (2026): Length, Dimensions, Aspect Ratio, Resolution & Thumbnail Size

Quick answer: YouTube Shorts must be vertical 9:16 aspect ratio, 1080×1920 resolution (1080p), up to 60 seconds long, and uploaded as MP4 or MOV under 256 GB. Thumbnails for Shorts are pulled from the video itself (you cannot upload a custom thumbnail for a Short on mobile, but you can on desktop after publishing).

YouTube Shorts is YouTube's response to TikTok — a vertical, short-form video format that lives in its own tab on the YouTube app. Since launch, the specs have shifted a few times: Shorts started at 15 seconds, expanded to 60 seconds in 2021, and the broader specs (aspect ratio, resolution, thumbnails) have settled into a stable format that's now consistent across the YouTube ecosystem.

This guide covers every spec a creator needs in 2026 — length, aspect ratio, dimensions, resolution, file size, thumbnail, and the technical requirements that decide whether your upload renders as a Short or a regular video.

How long can a YouTube Short be?

A YouTube Short can be up to 60 seconds long, with a minimum of 1 second. Most creators target 15–30 seconds for the highest completion rate and the strongest signal to YouTube's recommendation algorithm.

If your vertical video is longer than 60 seconds (61 seconds or more), YouTube will not classify it as a Short. It will appear as a regular vertical video on your channel — still uploadable, still vertical, but it won't show up in the Shorts feed and won't benefit from the Shorts-specific recommendation surface.

Practical guidance on length:

• 15–30 seconds — highest watch-through rate; ideal for hooks, quick tips, before/after, listicles

• 30–45 seconds — works for short tutorials, narrative pieces, or breakdowns

• 45–60 seconds — diminishing returns on completion rate; only use the full 60 if the content genuinely needs it

• Over 60 seconds — upload as a regular YouTube video; YouTube will not classify it as a Short

Pro tip: YouTube's recommendation algorithm weighs completion rate more heavily than view count for Shorts. A 15-second Short with 90% completion will out-perform a 60-second Short with 40% completion every time.

YouTube Shorts aspect ratio and dimensions

The required aspect ratio for YouTube Shorts is 9:16 (vertical). This is the same aspect ratio used by TikTok, Instagram Reels, and Snapchat Spotlight — meaning the same source video typically works across all four platforms.

A square (1:1) or landscape (16:9) video uploaded to YouTube will not be classified as a Short, even if it's under 60 seconds. The aspect ratio check is strict — if your source video is horizontal, you need to crop it to 9:16 or add vertical bars/padding to fit the 9:16 frame.

What happens if you upload at the wrong resolution?

• Below 720×1280: YouTube will upscale, but the video may look soft on modern phones

• Above 1080×1920: YouTube will downscale to 1080p for delivery; uploading higher resolution gives the encoder more headroom for sharp edges, but most viewers see 1080p

• Sweet spot: export at 1080×1920 for the best balance of upload speed and quality

YouTube Shorts file size and length limits

In practice, a 60-second Short at 1080p exported with reasonable compression lands at 30–80 MB. There's no reason to push file size — the encoder will compress aggressively for delivery regardless of upload size.

YouTube Shorts thumbnail size and requirements

YouTube Shorts thumbnails behave differently from regular YouTube video thumbnails, and this trips up a lot of creators.

On mobile: You cannot upload a custom thumbnail when publishing a Short from the YouTube app. YouTube auto-selects a frame from the video as the thumbnail.

On desktop: After publishing, you can edit the Short in YouTube Studio and upload a custom thumbnail. The spec:

Important: The Shorts thumbnail appears in two contexts with different croppings:

1. In the Shorts feed — the full 9:16 thumbnail is shown

2. On your channel page (Shorts shelf) — the thumbnail is cropped to a different aspect ratio (closer to 1:1) with the center of the image preserved

When designing a custom Shorts thumbnail, put the focal element in the center of the 1080×1920 canvas so it survives the channel-shelf crop.

YouTube Shorts vs. regular YouTube videos

A common source of confusion: YouTube accepts the same upload pipeline for Shorts and long-form videos. The difference is entirely determined by aspect ratio + length.

If a video is borderline (e.g. 9:16 at 60.5 seconds), YouTube classifies it as a regular video and you'll lose Shorts feed placement.

YouTube Shorts technical FAQ

What is the best resolution for YouTube Shorts?

1080 × 1920 pixels (1080p vertical). This is the recommended export resolution. You can upload up to 4K vertical (2160 × 3840), but most viewers will see 1080p anyway, and uploading higher resolution mainly helps the encoder produce sharper output.

What aspect ratio do I need for YouTube Shorts?

9:16 vertical. Square (1:1) and landscape (16:9) videos will not be classified as Shorts even if they're under 60 seconds.

Can I upload a horizontal video as a Short?

No. You'd need to crop or pad it to 9:16 first. Most video editors can do this in one click. If you upload a horizontal video at any length, YouTube classifies it as a regular video.

What is the maximum length for a YouTube Short?

60 seconds. Videos longer than 60 seconds will still upload but won't appear in the Shorts feed.

Can I add a custom thumbnail to a YouTube Short?

You can on desktop (via YouTube Studio after publishing), but not from the mobile app at upload time. Use 1080 × 1920 pixels with the focal element centered.

What file format does YouTube Shorts accept?

MP4 or MOV (H.264 codec recommended). Maximum file size is 256 GB, though most exports land well under 100 MB.

Why isn't my video showing up in the Shorts feed?

Three common causes: (1) the video is longer than 60 seconds, (2) the aspect ratio isn't 9:16, or (3) YouTube's classifier flagged something. Check the video's metadata in YouTube Studio — if it lists "Short" under format, it's eligible.

Does YouTube Shorts pay for views?

Yes, via the YouTube Partner Program for Shorts. Shorts monetization revenue comes from a Creator Pool funded by ads shown in the Shorts feed, distributed based on view share. CPM rates for Shorts are typically lower than long-form (around $0.02–$0.07 per 1,000 views), but the format trades CPM for volume. (For a full earnings breakdown, see our creator earnings estimator.)

How Virlo helps you make Shorts that actually perform

Knowing the specs is the floor. Knowing what to post is the ceiling — and that's where Virlo comes in.

Virlo tracks viral trends across YouTube Shorts, TikTok, and Instagram Reels in real time. We surface:

• Outlier Shorts — videos performing dramatically above a creator's baseline, so you can spot rising formats before they saturate

• Hashtag rankings across 500K+ tags, updated daily

• Creator and competitor tracking — see who in your niche is breaking out, and what they're posting

• AI-powered hook and idea generation — turn trending formats into your next Short

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• Earnings estimator: how much can you make on Shorts