Audit
Where it gets cut off
Every platform shows one or two lines of a caption and hides the rest behind a tap almost nobody makes. Writing a caption without knowing where that cut falls is writing for an audience that will not see it.
Preview
Not interactive yet
Your caption
I tested every budget espresso machine under $200 and only one...
- TikTok: about 1 line on most phones
- Reels: about 125 characters
- Shorts: title carries it instead
Three steps
How it will work
Paste the caption
The full thing, hashtags included, exactly as you would post it.
Check the first line
That is the caption in practice. Everything after it is a bonus for the small share who expand it.
Move hashtags last
A caption opening on hashtags has spent its only visible line on something nobody reads.
What it is for
Why this one is worth having
The first line is the whole caption
Expansion rates are low on every platform. Treat the visible fragment as the finished piece of writing and everything after it as optional.
Each platform cuts differently
The same caption truncates at three different points across TikTok, Reels and Shorts, and each one has a different relationship to the title field.
Captions are indexed
Search on TikTok and YouTube reads caption text well past the truncation point, so the hidden part still has a job. It is just not the job of persuading anyone.
Available now
What you can already do
Every clip already arrives with its caption written and editable before anything gets scheduled, so the first line can be fixed in the same pass as the video.
AI StudioFAQ
Caption length checker, asked and answered
How long should a caption be?
The first line should carry the point. Beyond that, length is a search decision rather than a reader decision, and longer is mildly better for being found.
Do hashtags belong in the caption?
Yes, at the end. Leading with them spends the visible line and has no discovery benefit over placing them last.
Does caption length affect reach?
Not directly. It affects whether the caption does its job, and it affects search matching, which are both real but neither is a ranking multiplier.
More tools
Others in the same corner
- Video caption generatorThe caption is the only part of a post a viewer can read before deciding to watch, and it is almost always written last, at 11pm, badly..
- 9:16 safe zone checkerEvery platform paints its own buttons over your video, in different places, and none of them show you that while you are editing..
- Hashtag generatorThirty hashtags made sense once.
The product is further along than the tools
Ten free videos, no watermark, and no card to start.