How to Add Captions to TikTok, Reels and YouTube Shorts

Short vertical videos live or die in the first second. Viewers decide very quickly whether to keep watching, and many of them are scrolling with the sound off. Captions are the simplest way to make sure your message lands either way.

This guide walks through adding captions to a TikTok, Instagram Reel or YouTube Short. It also covers the small decisions that separate readable captions from distracting ones.

Step 1: Start with clean audio

Every automatic captioning tool, including Vixo, works by listening to your audio. The better the audio, the fewer corrections you'll need later.

Record close to the microphone. A phone held at arm's length in a quiet room is usually fine. A phone across a noisy room is not.
Keep background music low while you speak, or add it after captioning if your editor allows it.
Speak at a natural pace. You don't need to slow down, but clearly separated words help the timing.

If you already have the video, don't worry. You can still fix individual words in the transcript before exporting.

Step 2: Generate the captions

Open the caption generator and drop your video onto the upload box.
If you know the spoken language, choose it from the menu. Auto-detect works well, but picking the language helps with short clips and mixed-language speech.
Wait a few seconds while the speech is transcribed. Every word gets its own start and end time, which is what makes word-by-word highlighting possible.

Step 3: Read through the transcript

Open the Captions tab and read every line. Automatic speech recognition is very good, but it can trip on:

Names and brands (your own name, a product, a place)
Slang and new words that weren't common when the model was trained
Homophones, like "their/there/they're" or "your/you're"
Numbers, which you might prefer as digits ("3 tips" rather than "three tips")

Click a line, fix the word, and press Enter. Clicking a line also jumps the preview to that moment, so you can check it against what you hear.

Step 4: Choose a caption style

Style is personal, but a few rules hold for nearly every short video:

Two to four words per line is the sweet spot for fast-paced talking videos. Longer lines force viewers to read instead of watch.
High contrast always wins. White or yellow text with a thick dark outline stays readable on any background.
Highlight the active word if your video is fast. The moving highlight guides the eye and makes the captions feel alive.
Use one font. Mixing fonts looks messy at this size.

If you're unsure, start with a preset and change one thing at a time. Our guide to caption styles for short-form video goes deeper.

Step 5: Position captions in the safe zone

Each app draws its own buttons over your video: likes, comments, share, the caption text and your username. If your captions sit under those, they get covered.

A good default is to place captions slightly below the vertical center, roughly two-thirds of the way down the frame. That keeps them clear of the bottom text overlay and the side buttons while staying close to your face, where viewers are already looking. In the editor you can drag the captions up or down directly on the preview. See caption placement and safe zones for more detail.

Step 6: Export and upload

Click Export video. The captions are burned into the video frames, which means:

They appear on every platform, in every app, on every device.
Nobody needs to turn them on.
They look exactly the way you designed them.

Download the MP4 and upload it to TikTok, Instagram or YouTube as you normally would. Don't turn on the platform's own auto-captions as well, or viewers will see two sets of subtitles on top of each other.

Common mistakes to avoid

Captions that cover faces. If you're speaking to the camera, keep text below your chin.

Too much text at once. A full sentence across three lines is hard to read in the half-second a viewer gives it.

Low contrast. Thin white text without an outline disappears on bright backgrounds like skies, walls and snow.

Skipping the proofread. One wrong word can change the meaning of a sentence or become the only thing commenters talk about. It takes thirty seconds to check.

Summary

Clean audio, a quick proofread, a bold high-contrast style and sensible placement are all you need. With an automatic tool, the whole process takes about a minute per video, and it makes your content watchable for the many viewers who never turn the sound on.