🎬 The Ultimate Guide to Instagram Reels, TikTok, and YouTube Shorts Video Length and Size (2026 Update)

"Why is my video getting cut off only on Instagram?!"

You’ve probably experienced uploading the same video to multiple platforms, only to find the text cut off in some places or obscured by the UI in others.

You might know that video length limits and aspect ratios vary by platform, but not knowing the exact differences can make your content look lower in quality and negatively impact your view count.

In this post, we’ll provide a complete breakdown of video specifications for Instagram Reels, TikTok, and YouTube Shorts as of 2026, along with a 'One Source Multi-Use' strategy to achieve optimal results across all three platforms with a single video!

1. Complete Guide to Maximum Video Lengths by Platform

Shall we start by checking the maximum video length for each platform?

Instagram Reels: Up to 90 seconds

• As of 2024, you can upload up to 90 seconds.
• Visible in both the feed and explore tabs

TikTok: Up to 10 minutes

• Starting at 15 seconds in the early days, it expanded to 60 seconds and 3 minutes, and has now reached up to 10 minutes.
• Long-form content is possible, but Shorts remains the primary focus.

YouTube Shorts: Up to 180 seconds (3 minutes)

• Expanded to up to 180 seconds starting October 2024 (a 3x increase from the previous 60 seconds)
• However, staying under 60 seconds is still advantageous for the algorithm.

🚨 How much is actually best?

While maximum lengths vary by platform, The optimal length preferred by the algorithm is 20–30 seconds.Indeed. Official YouTube reports also state that videos under 30 seconds have the highest completion rates.

Since fast pacing is essential for Shorts, it is much more effective to focus on the core content rather than trying to fill the maximum length.

Precautions

• If it's a long story? Use Shorts just for hooking, and direct them to long-form content or a blog for the main content.
• Rather than a single 60–90 second video Three 30-second videos are much more effective.

2. Complete Guide to Aspect Ratios and UI dead zones by Platform

The default aspect ratio for all Shorts is It's the same at 9:16 (1080x1920).

However, since each platform's UI covers different parts of the screen, you need to be careful as text or important elements might get cut off even when uploading the same video.

📱 Instagram Reels — Cropped to 4:5 in the feed

Key Features

• Reels themselves are 9:16, but Cropped to a 4:5 ratio in the feedAppears to be
• Bottom text is prone to being cut off when displayed as a thumbnail.
• Placement of profile icon, like, and comment UI at the top, right, and bottom

Essential production checklist

• Place text in the center or top-middle.
• Do not place subtitles or important text in the bottom 250px area.
• Maintain at least 5-8% side margins

📱 TikTok — Lowest screen utilization due to having the most UI elements

TikTok has the most UI elements on the right, top, and bottom, resulting in the smallest usable screen area for actual content.

Essential production checklist

• Never place text in the Like/Comment/Share/Profile area on the right side.
• The username and sound information are displayed at the top.
• Considering the bottom subtitle area, text should be Place in the exact centerIt's safest to do it.

📱 YouTube Shorts — Watch out for top/bottom UI

Essential Production Checklist

• Do not place important text in the top 15–20% (channel name and subscribe button are displayed here).
• Place above the center to avoid overlapping with the bottom subtitles.
• Avoid placing logos at the very top or bottom.

3. One-Source Multi-Use Strategy: Conquering Three Platforms with One Video

"...But seriously, who has the time to make a video three times?"

Don't worry. Perfect exposure on all three platforms with a single video.There is a way to make it do so.

✅ Checklist for producing videos for simultaneous upload to three platforms

1. Match the length to the shortest standard

• If you're going to upload the same video to all three platforms 60 seconds or lessCreated with
• Making them 90 or 180 seconds long may prevent uploads on some platforms or be disadvantageous for the algorithm.

2. Center text + generous margins

• Since the UI of all platforms is located at the top, bottom, and right side,
• Text and subtitles in the centerPlace in
• Ensure at least 8-10% left and right margins

3. Keep important elements within the safe zone only.

• Do not place key elements in the top 20%, bottom 25%, and right 15% areas.
• The top center is the safest placement for logos or branding elements.

🎥 How to repurpose long-form into Shorts

Here are the common layouts used when converting YouTube long-form (16:9) to Shorts (9:16):

layout structure

• Place the 16:9 original video in the center of the 9:16 screen.
• Top: Title or hook for Shorts
• Bottom: Subtitles, key message, logo

The top and bottom margins are filled with a black background, which actually has the advantage of making the top title and bottom subtitles more visible.

4. Reduce Shorts conversion time by 90% with AI automatic editing

"I have dozens of videos to convert into Shorts, but I don't have the time to edit them all one by one."

In cases like this, using an AI Shorts creation tool is the answer!

AlphaCutlike A service that automatically analyzes long-form videos to find key highlights and edit them into Shorts.With AlphaCut, you can easily create 10 or more Shorts in just 10 minutes.

What sets AlphaCut apart

1. Just enter a YouTube link and your Shorts are automatically completed!

• AI analyzes long videos to extract key highlights and edit them into Shorts.
• From ready-made templates to click-worthy titles, high-quality Shorts are completed instantly with just a single link.

2. Detailed video editing features for those who want more control

• You can add your own personal touches, such as editing titles and adjusting the length and aspect ratio.
• AI also recommends titles designed for effective hooking.

3. Approximately 300 won per Shorts

• 33 times cheaper than editing outsourcing services
• 300 won per Shorts
• Free pass for all subscribers

🚀 Grow your channel now by posting a single short-form video to YouTube, Instagram, and TikTok.

With AlphaCut, you can quickly and easily edit Shorts for various platforms.

If you need to create multiple Shorts from a single long-form video, use AlphaCut now to save on editing time and costs!

👉 Try AlphaCut for free (Get a 30-minute free trial)