The Perfect Video Sizes for TikTok, Instagram Reels, and YouTube Shorts

For creators on TikTok, Instagram, and YouTube, vertical short-form video has become the absolute gold standard for reach and engagement. But one of the most frustrating parts of the process is uploading a high-quality video, only to watch it look pixelated, off-center, or cropped once it goes live. This happens because each platform has its own strict dimension requirements, video specs, and compression engines.

If your video does not match the exact recommended aspect ratio and resolution, the platform will stretch, crop, or aggressively compress your content. In this comprehensive guide, we will lay out the exact video size for TikTok, Instagram Reels, and YouTube Shorts, so your uploads always look incredibly sharp and professional.

---

The Master Comparison of Short-Form Video Specs

To keep things as simple as possible, here is a master specifications table covering the three dominant vertical platforms in 2026:

While all three platforms are designed around vertical smartphones, their upload mechanics vary. Let's break down the optimal settings for each of them individually.

---

1. The Perfect Video Size for TikTok

TikTok is the pioneer of modern short-form video. The platform is highly optimized for mobile devices, and having the right video size for TikTok is vital if you want to land on the coveted 'For You' Page (FYP).

Recommended Specifications:

• Aspect Ratio: 9:16. Your video should be taller than it is wide. Standard horizontal widescreen (16:9) videos will be letterboxed with ugly black bars unless you edit them first.
• Optimal Resolution: 1080 x 1920 pixels. While TikTok supports 720p or lower resolutions, 1080p is the sweet spot for crispness.
• Maximum File Size: 287.6 MB on iOS and 72 MB on Android. For desktop web uploads, it supports files up to 1GB.
• Video Codec: H.264 with AAC audio.

If your video is shot in 4K, we highly recommend downscaling it to 1080p before uploading. TikTok's compression engine struggles with 4K files, often resulting in stuttering playback and compression artifacts that look much worse than a clean, locally-optimized 1080p export.

---

2. Instagram Reels Video Specifications

Instagram Reels is Instagram's direct competitor to TikTok. Because Instagram is built around visual aesthetics, keeping your reels in high definition is crucial to maintaining brand authority.

Recommended Specifications:

• Aspect Ratio: 9:16 for full-screen playback. Note that in the main home feed, Reels are cropped slightly to 4:5 (1080 x 1350 pixels). Make sure your key visuals, captions, and faces are in the 'safe zone' (the middle 60% of the screen) so they don't get cut off!
• Optimal Resolution: 1080 x 1920 pixels.
• Maximum File Size: 4 GB. While the limit is technically higher, you should try to keep files under 50MB to prevent loading lags.
• Video Codec: H.264 MP4.

Instagram is notorious for aggressive compression. If you upload a video with a high bitrate, Instagram will crush it. Use our Free Online Video Compressor to set a target bitrate of around 4,500kbps beforehand. This ensures your reel loads instantly and preserves the exact colors and crisp lines of your edit.

---

3. YouTube Shorts Upload Limits

YouTube Shorts are YouTube's answer to mobile content. Unlike TikTok and Instagram, Shorts are deeply integrated into the massive YouTube search ecosystem.

Recommended Specifications:

• Aspect Ratio: 9:16 or 1:1 (Square). YouTube automatically categorizes any video under 60 seconds that is square or vertical as a Short.
• Optimal Resolution: 1080 x 1920 pixels (or 1080 x 1080 pixels for square).
• Maximum Duration: 60 Seconds strictly. If your video is 60.1 seconds, YouTube will upload it as a standard horizontal video, completely breaking the short-form layout.
• Video Codec: H.264 or VP9.

Because YouTube Shorts have a strict time limit, trimming your video to the exact frame is crucial. If you have a longer clip, use our ultra-fast Online Video Cutter to crop it down to exactly 59 seconds or less before formatting.

---

Advanced Editing Tips for Vertical Video Creators

To take your mobile video production to the next level, adopt these industry best practices:

• Use the Safe Zone: Keep text overlay, speech captions, and important graphic elements at least 150 pixels away from the top and bottom edges. The bottom of the screen is covered by account names and descriptions, while the top is covered by search bars and menus.
• Prioritize High-Bitrate H.264 MP4: While newer codecs like H.265 (HEVC) shrink sizes further, social networks often take longer to process them. Standard H.264 MP4 is processed almost instantly, making your post go live much faster.
• Pre-compress Before Uploading: Instead of letting social networks compress your videos using default profiles, do it yourself. This gives you control over the final look and ensures no pixelation.

Optimizing your short-form dimensions is simple. Ensure you have cropped and trimmed your files to perfection to give your audience a premium viewing experience!