You export 1920×1080 landscape, crop in the app, and the captions sit under the UI. Or you export 9:16 but 720 wide, and it looks soft next to native phone video. Short platforms want a tall rectangle, safe zones, and a file that is not a 4GB HEVC surprise.
VideoDownloaderX helps you pull your own posted vertical clips for backup. A converter helps you make the next one to spec. This is the layout and export map.
The rectangle
9:16 is 1080×1920 for most “full HD vertical.” 720×1280 is acceptable and smaller. 4K vertical (2160×3840) is heavy and often recoded on upload anyway. For most creators, 1080×1920, 30fps, H.264, is the boring winner.
Stories and some ads use 9:16 too. Some still accept 4:5 (1080×1350) for feed. If you only make one file, 9:16 covers Reels, Shorts, TikTok, Stories with cropping risk at the top and bottom UI.
Safe zones
TikTok, Reels, and Shorts put username, captions, buttons on the bottom and sometimes the right. Keep faces and text out of the bottom ~250–300 pixels and off the right edge. Center-weighted is safer than edge-weighted. If you download your old post to check, look at where the UI ate your words. Fix the template.
Captions in the file vs on-platform
Burned captions you control will not jump when the app’s auto-captions fail. Place them above the UI. App captions may duplicate yours; then turn one off. Backup files from VideoDownloaderX may include burned words from the original export. That is useful for archive; for a new edit, go back to the project.
Length
TikTok and Reels lengths change. Shorts have a cap. Design the hook in the first second either way. A backup of a 10-minute lesson is not a Short; trim a 60-second cut. Do not upload a 20-minute 9:16 and hope.
Sound
Loudness: platforms normalize. Do not smash the limiter until it hurts. Keep music under the voice. If you re-download your video and the music is muted, a claim hit the public copy. Your editor project still has the mix. That is why backups of the project matter more than the public file.
Export settings
- 1080×1920 (or 1080×1920 after a 4K scale-down)
- 30 fps (60 if you have real 60 and the platform treats it well)
- H.264, high enough bitrate that skin and text hold
- AAC audio
- No VFR if you can avoid it
iPhone HEVC 9:16 is fine for the phone. For a Windows editor or a generic converter, transcode to H.264.
Cover frames
The cover is a thumbnail. Pick a frame that works in 9:16 with UI. You cannot use a 16:9 YouTube thumb as a Short cover without cropping a face off.
Mixing orientations
A 16:9 talking head in a 9:16 timeline needs a background (blur, color, extra b-roll). Black bars look like a mistake unless they are a style. Convert and reframe on purpose.
Backup of posted vertical video
When you grab your own TikTok with VideoDownloaderX, you get what the CDN serves: often 9:16, often compressed. Good enough to repost in an emergency, not as good as the CapCut export. Keep both.
Vertical is not “TikTok quality” as a vibe. It is a size, a safe zone, and a bitrate. Spec the rectangle, protect the lower third, export H.264, and archive the project. The platform will recode anyway. Give it a clean 1080×1920 to recode, not a 720 landscape afterthought.
Covers versus first frame
Apps often use the first frame as cover if you do not set one. A black frame or a messy jump-cut start kills the grid. Export a 9:16 still. Do not rely on frame zero.
Captions colliding with stickers
If you add stickers in-app, they sit on your burned captions. Leave a hole in the lower third or add stickers in the editor you control. Download your live post with VideoDownloaderX to see the real UI overlap, then fix the template.
Ads versus organic
Paid ads often want cleaner safe zones and no platform watermarks. Do not run a watermarked CDN backup as a paid ad. Use the clean 1080 by 1920 export.
Frame rate and motion
30fps is enough for talk. Product pans can use 60 if you shot 60. Mixing 24 and 30 in one account is fine. Mixing in one file is a convert. Keep one fps per export.
Vertical is a size, a safe zone, and a bitrate. Spec the rectangle. Archive the project. Give the platform a clean 1080 by 1920 to recode.
Safe zone templates
Keep a PNG overlay in the editor with boxes for TikTok, Reels, and Shorts UI. If text sits in the red, move it. Download your own live post with VideoDownloaderX and screenshot the UI if the overlay is outdated. Platforms move buttons.
Loudness for vertical
Vertical is often watched without headphones in public. Mix for phone speakers: voice forward, music back. A cinema mix will disappear on a bus.
Length for ads
Paid placements often cap length. Trim from the master to the cap. Do not speed the whole video 1.2x to fit; it sounds cheap. Cut story, not time.
Spec 1080 by 1920, protect the lower third, export H.264, archive the project. The platform will recode. Give it a clean file.
Checklist before you post
Is it 1080 by 1920 (or a documented exception)? Is the face above the lower UI? Are captions readable on a phone? Is the cover frame not black? Is the export H.264 from the project, not a watermarked CDN file, unless that is all you have? If you only have the live post, VideoDownloaderX can back it up, then you still wish you had the project. Run this list once. It is faster than remaking a Reel because the words sat under the share button.
Lighting and compression on vertical
Phone cameras already compress. Heavy grain plus a second platform recode looks like mud. Light the face. Do not fix it with 4K vertical if the light is bad. A well-lit 1080 by 1920 beats a noisy 4K. Backup with VideoDownloaderX will look even noisier if the original was noisy. Light first. Spec second.
4:5 feed and caption band
Instagram feed still likes 4:5 sometimes. If you only make 9:16, the feed will crop. Design 4:5 as a second export from the same timeline if feed is a real channel. Do not use a 9:16 backup from VideoDownloaderX as a feed post without checking the crop. Heads get cut off. If you burn captions, sit them above the platform UI and below the face. After you post, download your own video and see if the live UI covered a word. Fix the template.
Safe zone for captions you burn in
If you burn captions, sit them above the platform UI and below the face. That band is small. Short lines. High contrast. If a sentence is long, two lines, not a crawl into the buttons. After you post, download your own video with VideoDownloaderX and see if the live UI covered a word. Fix the template. One screenshot saves the next ten posts.