The exact specs for short-form video are 9:16 vertical, 1080x1920 resolution, H.264 or HEVC in an MP4 or MOV container, and under 60 seconds, with only the overlay and text safety zones differing meaningfully between Reels, Shorts, and Facebook Reels. One well-produced master can feed all three if the overlays are added per platform. Sprout Social's 2026 social media statistics show short-form video dominating social engagement, and DemandSage reports YouTube Shorts passing 2 billion monthly users, which is the audience the specs are served to.
What Aspect Ratio Should You Use?
9:16 vertical is the universal standard. It fills the full-screen feed on Reels, Shorts, and Facebook Reels, which is how viewers expect short-form content to look. Square or horizontal footage gets letterboxed, wastes screen space, and underperforms. The youtube shorts resolution and aspect ratio guide covers the technical detail for one of the three platforms.
Shoot vertically from the start. Cropping horizontal footage to 9:16 loses composition and looks amateur.
What Resolution and Export Settings Should You Use?
Export at 1080x1920 for 9:16, which is full HD vertical. Reels and Shorts both handle this well, and the platforms compress it into a lower delivery stream, so a higher source survives better. Use MP4 or MOV with H.264 or HEVC, which every platform accepts. The export settings are essentially identical across the three platforms.
The video repurposing per platform pipeline can standardize the master export and add per-platform overlays on top.
What Is the Ideal Length?
Under 60 seconds is the safe default for reach. Reels historically performed best at 15 to 30 seconds, Shorts allow up to 60 seconds, and Facebook Reels accepts similar lengths. Longer Shorts exist, but they change the retention game. For a distribution fleet, sub-60-second content structured for completion is the workhorse format.
The short form video hook formulas page shows how to fit a full arc into that window.
How Do the Platforms Differ on Overlays and Text?
The main differences are the safety zones: where captions, logos, and product tags can sit without being covered by the UI. Reels and Shorts have different UI elements on the right edge, so text and interactive elements must be positioned per platform. This is the per-platform work in video content format per platform.
The master video is the same; the overlays are what differ, which is exactly how a pipeline produces three versions from one file.
How Do Specs Affect a Distribution Fleet?
Standardized specs make the fleet's production pipeline repeatable: one master export, per-platform overlays, and a consistent cadence. The short form video posting schedule guidance assumes the assets are production-ready, which consistent specs guarantee. A fleet that posts well-formatted, correctly-sized content signals quality to every algorithm.
Specs are the boring foundation of distribution, and skipping them wastes the creative work.
How Conbersa Manages Video Specs Across Platforms
Conbersa's AI agents produce platform-tuned versions from standardized masters: 9:16, 1080x1920, H.264 exports with per-platform overlays and safety zones, distributed on bare-metal physical smartphones across isolated accounts. Conbersa handles the spec pipeline so the fleet posts correctly-formatted content on every platform.
We built this because the specs are the quiet part of distribution. Format every asset right, add the per-platform overlays, and the creative work actually reaches the audience it was made for.