A practical process, step by step
1. Start with the frame shape
A 9:16 canvas is a common starting point for full-screen vertical video. For example, 1080 × 1920 pixels has a 9:16 ratio, but the right export also depends on your footage, editor, and current platform requirements.
2. Fit the footage without stretching
If the source is horizontal or square, decide whether to crop, add a background, or reframe the shot. Stretching footage to fill a portrait canvas can distort faces and objects. Preview the crop before committing to an export.
3. Protect the message
Place key subjects and essential text away from the extreme edges. Platform buttons, captions, device differences, and changing layouts can cover parts of the frame, so treat safe zones as a practical guide rather than a universal guarantee.
4. Check captions at phone size
Short lines are often easier to scan than dense blocks. Break subtitles at natural phrase boundaries, keep line lengths consistent where possible, and preview them over the video rather than checking the text alone.
5. Watch a real export
A calculator can check dimensions, but it cannot judge every visual choice. Watch the exported file on a phone and confirm current platform specifications before publishing a large batch.
Useful rule: calculators provide a consistent starting point, not a guarantee of how a platform will process or display your content. Check the final result and verify current official specifications when exact compliance matters.
Tools for this workflow
Use the tool that matches the question you need to answer now. You can return to this workflow page whenever you need the next check.
Keep learning
These related guides explain the terms and trade-offs behind the workflow.
- YouTube Shorts size: dimensions and aspect ratio
- 9:16 aspect ratio: dimensions for vertical video
- Subtitle line length: how to break captions clearly
Frequently asked questions
What dimensions should I use for a vertical video?
1080 × 1920 pixels is a common 9:16 starting point. The best settings depend on the source footage, editing workflow, and current platform guidance, so verify the latest official requirements when they matter.
Should I crop or resize horizontal footage?
Resizing changes the overall dimensions; cropping removes parts of the image. For a vertical edit, reframing or cropping may fill the canvas, while adding a background can preserve more of a horizontal shot.
Can a safe-zone preview guarantee that text will never be covered?
No. Platform interfaces and placements can change, and overlays vary by device. Use the preview as a planning aid, then test the actual export in the target app.
How do I make subtitles easier to read?
Use natural phrase breaks, avoid unnecessarily long lines, maintain strong contrast, and preview captions on a small screen against the actual footage.
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