Vertical video is no longer the future — it is the present. Instagram Reels, TikTok, YouTube Shorts, Snapchat, and Pinterest all serve vertical 9:16 video first. If you are shooting on iPhone, the cleanest workflow is to edit the vertical video on iPhone too. No round-trip through a laptop, no upload, no waiting for a render.
This guide walks through the on-device workflow for editing vertical video — from import to caption export to post — with the settings that work for all three platforms.
Vertical video specs in 2026
All three short-form platforms converge on the same aspect ratio:
- Aspect ratio: 9:16 (vertical). Some platforms accept 1:1 and 4:5 but 9:16 fills the screen.
- Resolution: 1080×1920 minimum, 2160×3840 (4K vertical) supported on all three platforms.
- Frame rate: 24, 30, or 60 fps. 30 fps is the safe default.
- Duration: TikTok up to 10 minutes, Reels up to 3 minutes (with longer for some accounts), Shorts up to 3 minutes.
- File format: MP4 or MOV. Both work everywhere.
Two ways to start: shoot vertical or shoot horizontal
Option A: Shoot vertical (recommended for native feel)
Hold the iPhone vertically (portrait orientation) and shoot. The footage is already 9:16, so no conversion is needed. This is the right call when you know the final destination is short-form — the framing is honest, the motion feels native, and you skip the cropping step.
Option B: Shoot horizontal and crop in post
Shoot in landscape if you need flexibility — interviews, documentary footage, travel clips where the horizontal framing is part of the look. Crop to 9:16 in your editor by reframing the shot.
ReelClip exports trimmed clips at the original aspect ratio — it does not auto-crop or zoom. If you shoot horizontal and want vertical output, crop the framing yourself in your finishing editor, or use ReelClip's Slice mode which gives you full manual control over the frame.
The on-device workflow
Step 1: Import the footage
Open ReelClip and import from Photos or Files. The file is copied into the app's private sandbox — nothing is uploaded.
Step 2: Pick a cut mode
For vertical content, the right cut mode depends on what you are editing:
- Cut — splits by duration. Good for cooking videos, tutorials, listicles where each segment is roughly equal.
- Transcript — finds pauses in talking-head footage and lets you trim them. Good for podcasts, vlogs, interviews.
- Slice — manual highlight mode. Good when you already know which moments you want.
- AI — asks on-device Apple Intelligence to pick the moments based on a prompt. Good for vlogs where you have not yet decided which parts are best.
See how to cut a long video for TikTok for the detailed Cut mode workflow.
Step 3: Review every clip
Tap each planned clip, watch it from start to finish, and decide: keep, trim, or reject. ReelClip never auto-exports — you stay in control. Trim the start (the first second is what viewers decide on) and the end of each clip.
Step 4: Add captions
Around 80% of vertical video is watched on mute. Burned-in captions are not optional. ReelClip generates captions from the on-device transcript with one of four styles:
- Pop — bold, single word highlighted at a time. High-energy style for Reels and TikTok.
- Karaoke — word-by-word color change as it is spoken. Lively, good for music and entertainment.
- Clean — minimal styling, white text on a subtle background. Good for tutorials and explainers.
- One word — single large word at a time. Good for storytelling and short-form drama.
You can also export the SRT or VTT file separately and bring it into CapCut, VN, or any other editor that accepts caption files.
Step 5: Apply a LUT if you want a stylized grade
If you are grading DJI, Sony, or other log footage, apply the camera transform first, then stack a creative LUT on top. See the best free LUT packs in 2026 for the curated list of free packs and how to apply a .cube LUT on iPhone for the apply workflow.
Step 6: Export to Photos
Tap Save clips. ReelClip exports each approved clip to your Photos library at the original aspect ratio. The original file stays untouched.
Step 7: Post to all three platforms
One clip, three platforms. Upload the same file to Instagram Reels, TikTok, and YouTube Shorts — they all accept the same 9:16 MP4. Cross-posting is the cheapest growth move in short-form video.
Common vertical-video mistakes
- Uploading landscape footage with letterboxing.The viewer's phone is full-bleed vertical; a letterboxed video looks small and dated. Crop or reframe before posting.
- No captions. 80% mute-watched. Always add captions.
- Captions in the platform's auto-captioner. They drift, miss words, and look generic. Burned-in captions you control look better and reinforce brand consistency.
- Watermark on the export. Some iOS editors stamp every export with their logo. ReelClip's Creator tier does not.
- Uploading the raw 12-minute file. Tighter clips get watched further. Aim for under 90 seconds unless the content genuinely runs longer.
What to do next
For the broader short-form workflow including the Cut mode settings, see how to cut a long video for TikTok. For the podcast angle, see how to extract highlights from a podcast. For a comparison with CapCut and other iOS editors, see the best CapCut alternative without a watermark.