Utility guide
Vertical is a reframe, not a crop — direct it that way
Center-cropping a horizontal video for Shorts usually beheads the subject and buries the captions. This guide covers tracking reframes, background-fill techniques, safe zones, and caption placement that make vertical versions feel natively shot.
From the Mellius product team · Updated September 28, 2026
Conspiracy theorists, you may hate this
AI Director
›
Just type what you need
- ›Remove all silent parts
- ›Add bold kinetic captions
- ›Only have Bill Ackman speaking
- ›Cut to highlights only
- ›Add cinematic transitions
- ›Match cuts to the beat
The short answer
Set a 9:16 sequence and track the subject with keyframed position instead of locking a center crop. Fill leftover space with blurred background or redesigned graphics, keep text inside central safe zones, restyle captions large for phones, and export 1080 by 1920 with platform-matched bitrate.
Subject protection
Faces, hands, and key action stay framed through every shot with headroom and look room intact.
Native vertical feel
The result reads as designed for phones, not as a horizontal video with its sides amputated.
Platform-safe delivery
Text, captions, and calls to action clear every overlay, button, and progress bar on target apps.
Track the subject instead of center-cropping
Build a 1080 by 1920 sequence and reposition each shot so the speaker's eyes sit on the upper third with roughly ten percent headroom. Keyframe horizontal position to follow movement — pans in the original become tracked reframes in vertical — and cut between singles rather than squeezing group shots into one impossible frame. When the wide shot carries essential context, stack it above a caption panel or blurred fill instead of zooming until it suffocates.
Fill negative space deliberately: blurred and darkened background duplicates of the same footage preserve tone, while solid brand-color panels with large titles suit talking heads. Scale the source to fill frame height first, then adjust horizontally; never stretch to fit, which distorts faces instantly. In Mellius, ask for a vertical reframe conversationally and refine the tracked framing on the editable timeline, with undo covering every adjustment.
- Frame eyes on the upper third with headroom in every shot.
- Keyframe horizontal position to follow subjects and pans.
- Split group shots into singles instead of crushing them together.
- Fill leftover space with blur, panels, or graphics — never stretch.
Restyle text and export for the feed
Enlarge captions and titles for phone viewing and confine them to the central safe band, clear of bottom captions, right-side buttons, and top status overlays that consume up to a quarter of the frame. Burn in captions for Shorts, Reels, and TikTok since sidecars are unsupported, styling them above the platform's own caption zone. Hold calls to action center-frame for three seconds where no interface element can cover them.
Export 1080 by 1920 H.264 with bitrates near ten to sixteen megabits per second for detailed content, and check the file inside each target app before scheduling. TikTok, Reels, and YouTube Shorts each crop previews and overlay UI slightly differently, so one verification pass per platform prevents buried text. Keep the horizontal master archived so future ratios and platform changes get fresh reframes, not crops of crops.
Compare the workflows
| Method | Best fit | Trade-off |
|---|---|---|
| Tracked reframe | Highest quality; follows the action shot by shot | Takes real editing time on long videos |
| Blurred-background fill | Fast conversion preserving the full horizontal frame | Reads as repurposed rather than native vertical |
| Auto-reframe tools | Quick drafts and talking-head content | Review every shot; automation misjudges intent |
A practical sequence
Put it into practice
- 01
Build the vertical sequence
Set 1080 by 1920, then frame each shot's subject with headroom instead of center-cropping.
- 02
Fill and restyle
Treat backgrounds deliberately and enlarge captions inside central safe zones.
- 03
Export and verify in-app
Render platform-bitrate vertical masters and check overlays inside each target app.
Frequently asked questions
How do I convert a YouTube video to Shorts?
Create a 9:16 sequence, select the strongest sixty-second moment, and reframe it shot by shot with the subject tracked. Enlarge captions into the central safe zone and re-edit pacing tighter, since Shorts reward faster cuts. Export 1080 by 1920 and verify inside the Shorts app before publishing.
Why does my landscape video look bad as vertical?
Center crops usually cut faces, discard context, and leave text buried under platform UI. Reframe each shot with the subject tracked, fill leftover space intentionally, and restyle text larger for phones. The fix is directing a vertical version, not cropping harder.
What resolution should vertical videos be?
1080 by 1920 is the standard delivery for Shorts, Reels, and TikTok, exported as H.264 MP4. Start from the highest-resolution horizontal master so reframes stay sharp. Bitrates near ten to sixteen megabits per second suit detailed or high-motion vertical content.
Continue reading
Describe the edit. Keep the timeline.
Mellius turns conversational direction into cuts, captions, graphics, motion, color, and sound you can still inspect and change.
Start editing free