Karaoke Captions: How to Add Word-by-Word Highlighted Subtitles on iPhone

What Are Karaoke Captions?

Karaoke captions are on-screen subtitles that follow the speaker word by word: a short group of words sits on screen, and the word being said right now changes color. The name comes from karaoke lyric screens, where the lyrics light up in time with the song so singers know where they are.

On Shorts, Reels, and TikTok the same idea works for speech. Many people scroll with the sound off, and a moving highlight gives the eye something to track while the video plays. A viewer who reads along also takes in the whole sentence, which helps with fast talkers, accents, and jargon.

The effect depends on one technical detail: word-level timing. A regular subtitle file stores one start and end time per line. Karaoke subtitles need a start and end time for every single word, which is why they usually come from AI transcription and are rarely typed by hand.

Karaoke Style Captions and Full Line Captions

Karaoke style captions come in two common looks. In the reveal look, upcoming words are dimmed and each word brightens as it is spoken. In the read-along look, the whole phrase is visible from the start and only the color of the active word moves.

Bitcut has both as display modes, and both use the same word timestamps:

• Karaoke (the default) — the current group of words appears with upcoming words dimmed, and each word reaches full brightness and takes the active word color as it is spoken.
• Full Line — every word in the group is shown at full brightness, and the active word is marked by color alone.

Switching modes is instant and needs no reprocessing. The subtitle modes guide shows where the toggle sits in the settings panel.

How to Add Karaoke Subtitles on iPhone with Bitcut

Here is how to add karaoke subtitles to a talking-head clip, a podcast cut, or any video with speech.

If you start from a long recording, Generate Shorts can cut it into vertical clips first, and each clip keeps its word-level captions. The full workflow is in our guide to creating Shorts from a long video.

Animated Subtitles: Picking a Preset

Animated subtitles decide how each group of words enters the screen. Bitcut has seven presets that work in both display modes and carry over to the export:

• Fade — the default, a soft fade in and out that suits any content.
• Pop — words scale up with a small overshoot as they are spoken.
• Slide Up — the group slides in from below.
• Typewriter — words appear one after another with a short delay.
• Bounce — the group drops in from above and settles with a bounce.
• Glow — the active word gets a pulsing glow.
• Wave — words ripple up and down in a wave.

Match the preset to the pace of the talk. Pop and Bounce fit energetic clips; Fade and Slide Up keep interviews and tutorials calm. Glow reads best on darker footage.

Word by Word Captions That Stay Readable

Word by word captions only help if people can read them at a glance on a phone. These habits cover most videos:

• Keep lines short. Two to four words per group lets the eye take in the phrase and still follow the highlight. Eight words at once turns into a paragraph.
• Use one strong highlight color. Yellow, green, or cyan against white base text is easy to spot. A brand color works too, as long as it contrasts with the base text.
• Add contrast behind the text. A Plate background or text stroke keeps words legible over bright or busy footage. The Gradient background darkens only the area near the text.
• Size for the phone. Pinch on the preview to resize the captions. In a 9:16 frame there is less width, so larger text often reads better.
• Stay clear of platform UI. On Shorts, Reels, and TikTok the bottom of the frame holds the username, description, and music info, and the right edge holds the like and share buttons. Drag the captions above that area or move them toward the middle of the frame.

Bitcut stores three color channels separately: background, active word, and stroke. Each channel has preset colors plus two custom slots, so a brand color stays one tap away in every project.

Fixing Wrong Words and Timing

AI transcription misses names, product terms, and slang now and then. The bulk subtitle editor lists every phrase of every clip in one scrollable sheet, with the start time next to each phrase:

• Tap a phrase to retype it. The corrected words reuse the timing of the words they replace.
• Tap play on a phrase to hear that exact range and check the text against the audio.
• Swipe to delete phrases you do not want on screen, such as filler at the start of a take.

If the highlight drifts badly on a whole clip, the language may have been detected wrong, which happens with short clips or mixed-language speech. In the bulk editor you can set the project language or re-transcribe a single clip with a language you choose, and the new word timings replace the old ones.

Exporting Karaoke Captions Burned In

Bitcut burns captions into the video pixels during export. The preview matches the export: the same font, size, position, colors, highlight, and animation. The result is one video file with no separate .srt track, so the captions look the same on YouTube Shorts, Instagram Reels, TikTok, and in a messenger.

Burned-in text cannot be edited after posting, so finish the styling first. The project keeps your settings, and you can re-export with a different look at any time. Exports on the free plan carry a Bitcut watermark; Pro exports have none.

For platform-by-platform settings for Reels, see our guide on how to add subtitles to Reels automatically.

Other Ways to Make Karaoke Captions

• CapCut. CapCut's auto caption page says you can "create word-by-word captions in one tap" and then edit the text, timing, font, and placement. Caption style names and which styles are free can differ between accounts, so check the style badge and export screen before you rely on one. Our CapCut alternative comparison covers pricing.
• Edits by Instagram. The App Store listing says Edits can "generate captions automatically and customize how they appear" and exports in 4K with no watermark. It is free and made for Reels.
• Desktop editors. In Adobe Premiere Pro, an Adobe community expert suggested setting the Create Captions sliders to their minimum to get one word per caption; editors also use paid plugins and After Effects scripts for a true moving highlight. That route suits long projects edited on a computer.

The phone apps are faster for a single clip. A desktop editor gives more control over typography at the cost of setup time.

Frequently Asked Questions