Captions and Sound Design for Vertical Video

Previously: Tip #4: frame for 9:16.

Someone can find your episode on a train, in a queue or beside a sleeping child. You don't control whether their sound is on. Treat muted viewing as a normal way into the story, not a damaged version of the intended experience. Your pilot needs readable actions and burned-in captions. When a viewer unmutes, sound should add texture and tension rather than finally explain what has been happening.

Start with a silent story check

Watch your rough cut with no sound and no captions. You don't need to understand every line, but you should be able to identify who wants something, what blocks them and what changes. If two people simply stand still while exchanging essential information, the silent version probably has no scene to follow.

Give dialogue a visible action. Instead of only saying “You signed for me,” let the daughter turn the document around and place her finger on the signature. The mother slides the paper away. Now the accusation and the refusal are in the picture. Captions can carry the exact wording without carrying the whole scene on their own.

Burn in the lines the viewer needs

Burned-in captions are part of the exported picture, so they don't depend on someone finding a subtitle setting. Use them for spoken dialogue and any essential off-screen words. Check the final exported file, not only your editing timeline: a caption track that looks fine in the editor may not have been included in the render.

Keep the text accurate. A missing “not” can reverse a confession. A wrong character name can turn a reveal into confusion. If you're creating Hebrew and English versions, proofread each one separately and check right-to-left punctuation in the actual video. Automatic transcription is a starting point, not your final approval.

Make captions readable, not decorative

Use a clear typeface, strong contrast and a consistent position. Check the text over the brightest and busiest shots. A thin white line that looks elegant on a dark still may vanish over a wedding dress. A restrained backing or outline can help without turning every sentence into a graphic event.

Break captions at natural phrases. “I didn't tell her / because you asked me not to” is easier to follow than a break that separates “didn't” from the verb. Avoid covering the hand that steals the key or the mouth whose reaction matters. Watch at phone size and give each line enough time for an ordinary reader, not just someone who already knows the script.

Let captions support the performance

Don't fill the screen with a paragraph while the character makes a tiny, important choice. Trim the spoken line, split the action or give the caption more time. If the text constantly races past, your scene may be trying to say too much.

You can also use an existing story object instead of extra explanation. A short message on a phone, shown clearly, can establish a threat. But don't duplicate it with a long caption and narration unless each adds something different. The viewer should be able to look at the person as well as read the words.

Reward the viewer who unmutes

Sound can make a readable moment feel closer. The dry click of a lock, a ring touching a table or a breath held before a lie adds detail. Choose a few sounds tied to actions instead of placing a heavy impact under every cut.

For the contract scene, try quiet room tone, the scratch of the pen and a chair scraping as the daughter stands. Let the music pull back before the accusation so the voice has space. If a door closes at the cliffhanger, its sound can underline the trap. We should already understand the trap from the image; the sound makes us feel it.

Test both versions before submitting

First watch muted with captions. Then listen on ordinary phone speakers, not only headphones. Can you hear the dialogue without turning everything up? Does music obscure a crucial word? Compare loud and quiet moments so a sudden effect doesn't overwhelm the scene.

Finally, show someone the muted export without explaining it. Ask what happened and what they expect next. Then let them watch with sound and ask what it added. For your PilotRush pilot, a useful answer is “It made the scene tenser,” not “Now I finally know why she was crying.”