How to design a vertical how-to clip with text captions

A vertical how-to clip has little room for clutter. If the steps are hard to follow, captions cover the important action, or the final video looks cropped on a phone, viewers may miss what you are showing.

Start with one clear task, build the video in a 9:16 frame, and add short captions that match each action. If you are demonstrating computer software, TooLab's Screen Recorder can capture a screen, window, or tab for you to edit later. It does not add captions. You will need a video editor for the layout and text.

Build the clip in a vertical format

1. Choose one task and capture the source. Write down the single thing the viewer should learn, such as changing one setting or completing one repair. For a desktop walkthrough, capture the demonstration with the Screen Recorder, then import the recording into your video editor. It runs on computers, not phones, and recordings stay on your device. For a phone demonstration, use the phone's built-in screen recording feature or record the action with a camera.
2. Set the project to 9:16. Select a vertical project or canvas before arranging clips. A common full-resolution size is 1080 by 1920 pixels. If your source is landscape, decide whether to crop it, fit the whole image with empty space around it, or record a new vertical take. Check that the important controls or objects remain visible after cropping.
3. Put the actions in order. Arrange the footage so each action follows the one before it. Remove long pauses, repeated attempts, and moments when nothing changes. Keep enough time for viewers to see where you tap, click, or move an object. Do not cut away just as an important change appears.
4. Add captions that match the action. Break instructions into short phrases, usually one idea at a time. For example, use “Open the display settings” while showing that screen, then “Choose the monitor” when you select it. Keep captions to one or two lines, and leave them on screen long enough to read without pausing.
5. Preview and export the video. Watch the whole clip in the editor's vertical preview, then watch the exported file on a phone. Check the first and last frames, caption timing, sound, and whether any important detail is cut off. If the editor offers format choices, MP4 with H.264 is a widely supported option for sharing.

Choose what belongs on screen

Captions explain the next action

Use captions to name a step, explain a choice, or warn about a common mistake. They should support the demonstration, not repeat every word you say. A short instruction such as “Save a copy first” is easier to follow than a full sentence that fills the screen.

Labels point out details

Use a brief label when the viewer needs to notice a small control, setting, or object. Place it near the relevant detail without covering it. If a pointer, outline, or brief zoom can make the target clearer, use that instead of adding a paragraph of text.

Voiceover adds explanation

Speak when a step needs context that is difficult to show. Keep the narration aligned with the footage, and avoid describing actions several seconds before they happen. If your tutorial works without sound, make the captions clear enough that viewers can still follow it while muted.

Fix common caption and layout problems

1. Make text easier to read. Increase the font size until it is comfortable on a phone, not just on your computer monitor. Use a plain font, strong contrast, and a solid or lightly shaded background behind text when the footage is busy.
2. Move captions away from important details. If text hides a button or the object being demonstrated, move it to a clear part of the frame. Keep the main action near the center so it remains visible when different platforms place controls over the video.
3. Shorten captions that need too much time. Split a long instruction into separate phrases and show each one with the relevant action. Do not speed up the footage just to fit a long sentence on screen.
4. Fix captions that appear too early or late. Adjust the text clip so it begins when the step becomes relevant and disappears when the next step starts. Replay that section with sound off to check whether the visual timing makes sense on its own.
5. Reframe a landscape recording. If a vertical crop cuts off the pointer or an important part of the screen, zoom out or reposition the image. For a computer tutorial, consider recording a narrower application window or making a separate close-up shot instead of shrinking all the footage until it is unreadable.
6. Balance narration and background sound. Lower music or other background audio so speech stays clear. If the sound is still distracting, record the narration again in a quieter room and align it with the same actions.

Keep captions clear of phone controls

Apps often place buttons, descriptions, or account information over parts of a vertical video. Those overlays differ by platform and can change, so avoid putting essential words at the extreme bottom or along the right edge. Keep text and key actions within the central part of the frame, with visible space around them.

Also check your captions against the footage, not just against a blank background. White text can disappear over a bright wall, while dark text can vanish over a shadow. A simple outline or contrasting text background can help, but keep the style consistent so the viewer's attention stays on the steps.

Before sharing, watch the exported clip at normal speed on a phone with the sound muted once, then with sound on.