1080p

1080p became the dominant video resolution standard around 2010 and has stayed dominant for over a decade — a remarkably long run in tech timescales. The reasons are practical: 1080p hits the resolution where most viewers can no longer perceive individual pixels at typical viewing distances on phones and laptops, and the file sizes are still small enough for efficient streaming over modest connections. Pushing to 4K (3840×2160) quadruples the data and provides only marginal perceived quality gains on small screens.

For vertical video (TikTok, Reels, Shorts, Stories), 1080p typically refers to 1080×1920 — the same total pixel count, just rotated 90 degrees. The platform cap is the longer edge: 1080. Anything claiming to download TikTok or Instagram in 4K is misleading, because the source files only exist at 1080p maximum.

The practical implication for downloading: when you save a TikTok or Reel, you get a 1080×1920 MP4. That's the highest quality the platform itself stores; no third-party tool can produce a higher-resolution version because the source data simply doesn't exist at that resolution.