How to Make Word by Word Karaoke Captions

Karaoke caption specs by platform

The highlight works the same everywhere. What changes is the safe area, because each app puts its buttons and text in slightly different places.

A practical size for 1080x1920 is a caption height of roughly 60 to 90 pixels per line, with a 4 to 6 pixel outline. That stays readable on a small phone without covering the face.

The parts of a karaoke caption

• Line length. Three or four words per line for most speakers, two for very fast talkers. Seven words with a highlight crossing them is hard to follow.
• Timing. The highlight should land on the word, not after it. A delay of even a few frames (around 0.1 seconds) feels off, even if viewers cannot say why.
• Highlight style. Colour change (most common and most readable), moving box behind the word (energetic), scale bump (subtle), fill sweep left to right (best for songs) or underline (minimal and editorial). Pick one per video.
• Font and colours. One bold sans, often in capitals, white with a thin black outline, plus a single highlight colour.
• Line breaks. Break at natural pauses, so "the real reason" stays on one screen. Keep names, numbers and the words around them together.

Mixing highlight styles in one video is the most common mistake. When the box, the colour change and the scale bump all appear in the same minute, viewers start noticing the captions instead of reading them. One style, used everywhere, becomes invisible in the best way. The same goes for colour: one highlight colour for a solo video, and one per speaker only when there is more than one voice.

Worked example: 12 seconds of karaoke captions

An illustration of how one spoken sentence becomes caption lines. The speaker says: "Most people quit in week two. Not because it is hard, but because nobody told them what week two feels like." That is 21 words in about 7 seconds, a normal speaking pace of roughly 3 words per second.

Seven lines for one 21 word sentence, never more than four words on screen, and every line break sits where the speaker breathes. Done by hand in Premiere Pro or CapCut, timing word highlights like this typically takes 15 to 30 minutes per minute of video. With auto timing, the job becomes checking a fast section and fixing a few names.

Karaoke caption prompt for Otto

Adapted from real requests Videotto users sent to Otto. Upload the video or paste a link to your own, then add the names it should spell.

Add word by word karaoke captions to my video, vertical 9:16.
Three to four words per line, in the middle third of the frame.
Bold sans, all caps, white with a thin black outline.
The current word turns [highlight colour] exactly as it is spoken.
Break lines at natural pauses. Keep names and numbers on one line.
Spell these correctly: [names, brand terms].

Shorter karaoke caption prompts

• "Karaoke style subtitles throughout, key word glowing."
• "Small uppercase captions that light up word by word."
• "A red highlight box that jumps from word to word."
• "Same captions, but in Spanish."

How to make karaoke captions in 5 steps

1. Upload the video. Or paste a YouTube link to your own video. Clean audio gives cleaner word timing.
2. Pick one highlight style. Colour change for most talking videos, box for high energy, fill sweep for songs.
3. Set the line length. Three or four words. Drop to two if the speaker goes faster than about 3.5 words per second.
4. Choose font and colours. One bold font, white base, one highlight colour that contrasts with your footage. Give each speaker their own colour in interviews.
5. Check names, terms and a fast section. Fix misheard names and brand terms, then watch the fastest 10 seconds to confirm the highlight is on time.

Troubleshooting karaoke caption sync

FAQ