Caption Line Breaker & SRT Maker

Paste your script and this tool splits it into short, phone-friendly caption lines — then lets you copy them or export a rough SRT subtitle file. No account, nothing leaves your browser.

Short answer

Break your script into lines of about 34 characters — the sweet spot that fits a phone screen without breaking words awkwardly — and show one or two lines per caption. Export the result as an SRT to drop straight into your editor.

Your script

Max characters per line34

32–38 fits a phone screen without breaking awkwardly.

Lines per caption

Video length (optional)

Leave empty and we estimate reading time.

15 captions15 lines · 59 words≈ 21 sec on screen

Preview

00:00–00:01

Three things nobody tells you

00:01–00:03

about growing on YouTube.

00:03–00:05

First, your first fifty videos are

00:05–00:06

practice.

00:06–00:08

Nobody watches them, and that is

00:08–00:08

fine.

00:08–00:10

Second, the algorithm is not

00:10–00:10

against you.

00:10–00:12

It is waiting for you to be

00:12–00:13

consistent.

00:13–00:15

Third, retention beats views every

00:15–00:16

single time.

…and 3 more. Copy or download to get all of them.

Why caption line length matters

Captions are read, not watched. If a line runs past the edge of the screen or wraps mid-word, viewers lose the thread for a split second — and in the first two seconds of a Short that is enough to scroll away. Short lines at a consistent width keep the reading rhythm effortless, which is why nearly every big clip channel keeps captions tight.

Line length is also an accessibility question. Keep the text large enough to read on a small phone at arm's length, and never put more than two lines on screen at once. That covers sound-off viewers and keeps retention up.

How to format captions for Shorts, Reels & TikTok

Break your script at natural pauses — after a phrase or a clause, not in the middle of an idea.
Keep every line under ~38 characters so nothing clips off a 9:16 screen.
Show one or two lines per caption; too many lines crowd the frame.
Keep the timing in sync with the spoken words — captions that lag feel broken.
Use one clean style (same position, size, and color) for the whole video.

Platform	Common caption style	Line guidance
TikTok	Word-by-word pop captions	Very short bursts, fast rhythm
YouTube Shorts	1–2 line classic subtitles	32–38 chars per line
Instagram Reels	Styled subtitles (bold, outlined)	1–2 lines, ≤ 38 chars

Captions vs. SRT — what should you use?

A caption is the text you see on the video. An SRT file is a subtitle file that pairs that text with start and end times. If your editor imports SRT, exporting one here means your caption lines are already timed and placed — you style them once instead of typing every line.

If you only need a visual reference while editing, copying the plain caption lines is enough. Either way, this tool gives you both from the same paste.

Estimating on-screen time

A rough rule of thumb: about 16 characters per second of speech. If you know your video's length, enter it and the tool distributes the captions across it; otherwise it estimates from your text. Treat the timing as a starting point and nudge it in your editor.

Rule of thumb

Read your caption lines out loud. If you stumble or pause mid-line, the break is in the wrong place — move it to the next natural word boundary. Text that reads smoothly in your head will read smoothly on screen.

FAQ

How many characters per line should captions be?

For vertical short-form video, keep each caption line under 38 characters. Lines around 32–38 characters fit a phone screen without awkward mid-word breaks and are readable at a glance. TikTok-style word-by-word captions use even shorter bursts.

How do I format captions for YouTube Shorts?

Break your script into lines of roughly 32–38 characters, keep two lines or fewer on screen at once, and match each caption group to the words being spoken. Exporting the lines as an SRT file gives you timing hooks your editor can snap to.

What is an SRT file?

SRT is the standard subtitle format: a numbered cue, a start and end timecode, then the caption text. Tools like CapCut, Premiere Pro, and most editors import SRT directly, so you can auto-place your caption lines instead of typing them.

Should every word be its own caption like TikTok?

Word-by-word captions are a style choice, not a rule. They work for punchy, high-energy clips. For educational or conversational content, one or two clean lines per caption is easier to read and feels less frantic.

Ready to stop cutting clips by hand?

Captions keep viewers watching — OwlClip creates the clips to put them on. Paste a long YouTube video and get finished vertical clips with captions in minutes.

Try OwlClip Free