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Calculate Size
☆ Updated for 4K 60fps & 9:16 Short-Form Safe Zones

Creator Video Bitrate & File Size Calculator

Calculate video export file sizes for YouTube, TikTok, and Instagram Reels. Preview UI safe zone margins so captions never get obscured by platform buttons.

Video Encoding Parameters

Hours
Minutes
Seconds
15.0 Mbps
Estimated Export File Size
165.2 MB
(0.16 GB)
Estimated Upload Time
50 Mbps Broadband: ~26 seconds
100 Mbps Fiber: ~13 seconds
9:16 UI Safe Zone Guide
Top Bar / Header Zone
Safe Text & Caption Zone
Caption / Audio Link Zone

Short-Form Video Encoding & Safe Zone Optimization

Creating high-engagement video content across TikTok, Instagram Reels, and YouTube Shorts requires mastering two core disciplines: Bitrate Optimization (to avoid destructive platform re-compression) and UI Safe Zone Compliance (to ensure titles, CTAs, and captions are never obstructed).

1. The Bitrate Equation

Digital video file size is determined purely by bitrate and runtime, completely independent of pixel resolution:

File_Size_MB = ((Video_Bitrate_Mbps + Audio_Bitrate_Mbps) × Duration_Seconds) / 8

Exporting at excessively high bitrates (e.g., 80 Mbps for a 1080x1920 reel) triggers severe platform transcoding, resulting in compression artifacts. For 1080p vertical video, a variable bitrate between 12 to 18 Mbps yields optimal clarity.

2. Safe Zone Specifications

TikTok, Instagram, and YouTube Shorts overlay like buttons, share icons, profile avatars, and audio metadata on top of your video. To protect your subtitles:

  • Top Margin: Keep critical text 150px below the top edge (clears account search bars and camera notches).
  • Bottom Margin: Reserve 320px from the bottom (clears author captions, hashtags, and sound title tickers).
  • Right Margin: Leave 120px clear on the right edge (clears like, comment, and bookmark action stacks).

Frequently Asked Questions

Why do my 4K Reels look blurry after uploading? ↓

Instagram downscales all vertical video to 1080x1920 during server processing. If you upload heavy 4K files, their compression engine aggressively compresses the footage. Export natively at 1080x1920 in high-profile H.264 for crisp playback.

What is the ideal audio bitrate for social video? ↓

320 kbps AAC stereo is the gold standard for voice and music fidelity before uploading.