How to Resize a Video for TikTok
The fastest way to resize a video for TikTok is to set the frame to 9:16 and export at 1080x1920. Comfortably inside the pixel range TikTok's own documentation accepts, and the shape the feed is built for. Here's the workflow, and the distinction that trips people up.
Resize a video for TikTok to the size it actually accepts
TikTok's Content Posting API documentation states a picture size minimum of 360 pixels and a maximum of 4096 pixels on both height and width. That's a wide window, and 1080x1920 sits in the middle of it. There's no reward for pushing toward the ceiling.
Bigger files, same feed
Resolution and quality aren't the same lever. TikTok announced a high-quality upload option that lets creators upload their videos in up to 1080p HD, rolled out in select regions. A useful signal, because a platform that treats 1080p as its premium tier isn't going to reward an oversized master. Exporting far above 1080p mostly buys you a longer upload and a re-encode on the way in.
The other half of the confusion is shape. A 4096-pixel-wide horizontal file is enormous and still the wrong shape. Getting the frame to 9:16 does more for how the video looks than any pixel count.
One export target instead of three
Montaj edits vertically and exports at 1080x1920 in HEVC (.mp4), so there's no separate resizing pass and no dialogue box asking you to pick a preset. The frame you edit in is the frame that comes out, and the whole render happens on your device with nothing uploaded. If you already know how to resize a video for TikTok, that's exactly the target it's aiming at.
How to resize a video for TikTok in 4 steps
- 1
Separate the shape from the pixel count
The aspect ratio is the shape of the frame. The resolution is how many pixels fill it. Resizing usually means changing one, not both.
- 2
Stay inside TikTok's accepted range
TikTok's Content Posting API documentation gives a picture size floor of 360 pixels and a ceiling of 4096 pixels on both height and width.
- 3
Target 1080x1920 for vertical
A vertical frame at 1080x1920 sits comfortably inside that range and matches what the feed displays.
- 4
Turn on high-quality upload if your region has it
TikTok announced an upload option letting creators upload their videos in up to 1080p HD, available in select regions.
The verdict
— Kenji, Content Creator & Strategist