How to Add Captions to Videos: The Complete 2026 Guide

Captions vs subtitles: what's the difference?

People use the two words interchangeably, but there is a useful distinction. Captions transcribe what is said in the same language as the audio, and are designed for viewers who cannot or do not want to hear the sound. Subtitles usually translate speech into another language for viewers who can hear but do not understand it.

For short-form video the line blurs. A Reel in Hinglish with English captions is both. What matters is that the words on screen match the speech, appear at the right moment, and are easy to read on a phone.

Option 1: type captions manually

Manual captioning means listening to the clip, typing every line, and setting a start and end time for each one. It gives you full control but is slow: even an experienced editor spends several minutes per minute of video, and timing words to the frame is tedious.

Manual work still makes sense for very short clips with almost no speech, or for scripted text overlays that are not spoken at all.

Option 2: auto-generate captions with AI

Auto-captioning tools listen to your audio, transcribe it, and time each word automatically. You then review the text, fix any names or slang, choose a style and export. For most creators this turns a 20-minute task into a two-minute one.

In CaptionFy the flow is: upload your vertical video, press Create captions, review the timed lines in the editor, pick a style, and export. Your video file stays on your device; only prepared audio is sent for transcription.

• Upload the clip (MP4 or MOV from your phone works fine).
• Choose the spoken language, or let detection pick it.
• Generate captions and read through every line once.
• Fix names, brand terms and slang directly in the editor.
• Pick a caption style and adjust size and position.
• Export the finished video at source quality.

Make captions readable on a phone

Short-form captions are read in a fraction of a second. Keep lines short — two to six words is a good range — and use a bold, high-contrast font. A thin outline or soft shadow keeps text readable over bright footage.

Place captions in the safe area: away from the very bottom, where platform buttons and descriptions sit, and away from the right edge, where like and share icons appear. The middle-lower third of the frame is usually the safest spot.

Timing: the part most people get wrong

Captions that appear late feel broken, even if the words are right. Good tools time each word to the speech, so a highlight or reveal lands exactly when the word is spoken. After generating, scrub through the busiest part of the clip and check that lines do not linger after the speaker stops.

If two speakers overlap, split the line so each speaker's words appear separately. Viewers follow conversation much more easily that way.

Export and post

Burned-in captions are part of the video image, so they look identical on every platform and cannot be turned off. That is what most Reels, TikTok and Shorts creators want. Export at the same resolution and frame rate as your source to avoid a soft or choppy result.