Online Tool Store
Caption Line Counter
Check video caption lines against a max character limit and estimate reading speed for a given video duration. Runs entirely in your browser.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Total lines
Lines too long
Reading speed
| # | Line | Chars |
|---|
How the caption line counter works
- Paste your caption or subtitle text, one line per caption card.
- Set your platform's max characters per line and optionally the video duration.
- Review which lines exceed the limit and check the estimated reading speed.
FAQ
Why does line length matter for captions?
Subtitle guidelines commonly recommend around 42 characters per line so text fits comfortably on screen and stays readable at a glance, especially on smaller screens.
What does the reading speed (wpm) tell me?
It estimates how fast a viewer would need to read your captions given the video duration - very high values may mean your captions are too dense for the pacing of the video.
Can I customize the max line length?
Yes - adjust the "Max characters per line" field to match your platform's specific subtitle guidelines (they vary slightly between YouTube, Netflix-style specs, and others).
Does this generate an SRT or VTT subtitle file?
No - it focuses on checking line length and reading pace for caption text you've already drafted, not on producing timed subtitle files.
How we compare
| Feature | Online Tool Store | Manual line counting | Full subtitle editor software |
|---|---|---|---|
| Instant flagging of long lines | ✓ | ✗ | ✓ |
| Reading speed estimate | ✓ | ✗ | ✓ |
| No install required | ✓ | ✓ | ✗ |
A quick check before finalizing captions in a full subtitle editor.