How to Post a Video to TikTok: Size, Length & Format
Last updated: June 12, 2026
TikTok is a vertical-first platform. Post a landscape video as-is and you get big bars top and bottom and a small picture. This guide covers the best size, length and format, and how to turn a landscape clip vertical.
TikTok guidelines (approx.)
| Item | Recommended |
|---|---|
| Aspect ratio | 9:16 (full vertical) |
| Format | MP4 or MOV (H.264) |
| Length | A few seconds to a few minutes (shorter tends to perform better) |
※ Specs and plans can change.
Turn a landscape video vertical (9:16)
Fitting vertical is the most important step. A landscape (16:9) clip shows small and is easy to scroll past. Crop to 9:16 and it fills the screen with more impact. Our crop tool does 9:16 in one tap.
Sort out length, format and size
- Long video: trim to the highlight for better pacing and retention.
- Unsupported format: convert to MP4.
- Large file: compress for a faster, lighter upload.
The first seconds matter most
Viewers swipe fast, so put your strongest moment or the conclusion right at the start. Trim away the intro, and use speed change to tighten the pacing where needed.
FAQ
- Q. Can I post a landscape video?
- A. You can, but it shows small with bars. Crop to 9:16 first for best results.
- Q. Is my video uploaded?
- A. No — our tools process everything in your browser.
- Q. Can I do this on my phone?
- A. Yes — crop/trim in your phone's browser, then post in the TikTok app.