How to add captions to a video on your phone
Captions aren't decoration — they're how your message reaches people watching on mute. Here's what makes captions readable and how to add them on your phone without typing a single word.
Why your video needs captions
Lots of people scroll with the sound off: on the train, in line, at work, late at night next to someone sleeping. If your video is voice only, they see a talking head with no idea what it's about — and swipe on.
Captions fix that instantly. They help viewers with the sound on too: eyes lock onto the text, the idea is easier to follow, and a tricky word or name doesn't need a replay.
What makes captions readable
Good captions can be read in a split second — nobody should have to decode them. So aim for:
- short lines — a few words, not a whole sentence across half the screen;
- a big, simple font without thin serifs or flourishes;
- contrast with the background: light text with an outline or on a box, so it doesn't vanish against a bright wall or window;
- lines that change with your voice — never running ahead or lagging behind;
- one style for the whole video and your whole account, so people recognize you in the feed.
Break lines by meaning, not by character count: “Three mistakes / in your first video” reads better than “Three mistakes in / your first video”.
Where to place captions in the frame
The usual spot is below your face, roughly in the lower third. Just not at the very edge: apps put the video description, your username and buttons along the bottom and right side, and they'll cover your text.
Keep captions off your face and away from gestures or anything you're showing with your hands. Before posting, watch the video on your phone the way a viewer would: is everything visible, is anything covered?
How to highlight the key word
Every line has a word that carries the meaning: a number, a name, a takeaway. Make it stand out with color, a box or size, and viewers get the point even if they only skim.
Just don't overdo it. One highlighted word per line works; three turn into noise, and the eye no longer knows where to land.
Check for transcription errors
Any AI slips up now and then, especially where it's easy to. Before saving, scan for:
- names and brand names;
- industry terms and slang;
- numbers and dates — “fifteen” and “fifty” get mixed up even by people;
- words you said quietly, quickly or on an out-breath.
A single typo in captions stands out more than you'd think: the comments end up discussing it instead of your point.
How to add captions automatically
Typing captions by hand in a video editor is slow work: listen, type, slide every line to match your voice. Automatic captions are built from a transcript where every word already has its own timing.
In Dubl, captions appear on their own as soon as the AI transcribes your speech. You get 9 styles, 8 fonts, your own colors and “Smart” mode: it splits text into short lines by meaning, drops “um” from the captions and highlights the key word in each line. Want every word exactly as said? Choose “Verbatim”.
How to do it in Dubl
- Record or add your videoFilm your takes with the in-app teleprompter or pick videos from your gallery — no typing needed.
- Pick a styleOne of 9 styles, a font and colors. You can grab a color right from the frame with the eyedropper.
- Put captions in placeDrag the caption anywhere in the frame and pinch to resize it.
- Check the text and saveFix any word under “Customize” → “Text”, then save the video to your gallery.
