get a short, medium and long caption for tiktok, instagram reels or youtube shorts. each one focuses on a single action and shows a live character count against that platform's real limit.
platform fit
live previewthe small edit that fixed retention
this cut changed the whole video
watch what happens at 0:02
save this for your next edit
the counter under each version measures against the field you are posting into, so a long caption on a shorts title shows as over the limit rather than silently cut.
the viewer has already watched, or is about to. a caption that just describes what they can see wastes the one line they will actually read. instead it should do three things: remind them of the promise, include the words someone would type to search for it, and ask for one thing.
first line
~1
line shown before the rest gets cut off
most people never tap to read past this point. put the promise and the search words before it, and save the ask for after.
search words
2-4
plain words, not hashtags
youtube says directly that it matches search against the text in your description. write the words a real person would type, not tags.
the ask
1
thing to ask for per caption
follow, save, comment or click. asking for two things in one caption usually gets you neither, because people just do nothing instead of choosing.
each version is written for a different amount of reading. the counter under each one shows how much of that platform's field it uses, so you can see if it will get cut off instead of guessing.
one line, fits anywhere
the only version short enough for a youtube shorts title. use it when the video speaks for itself and all you want is a follow.
promise, context, then the ask
the default for tiktok and reels. the ask comes after the visible line, which is fine for saves and comments because the reader has already decided to keep reading.
the version built to get found later
use it in a youtube description or a tiktok caption you want people to find months from now. it adds the plain words someone would search for, without repeating itself.
it will not increase your view count
views come from your opening seconds and how well the video holds attention. the caption only nudges people who already watched toward one action, which is a smaller but more reliable win.
it does not know exactly how each platform weighs caption text
youtube confirms that descriptions feed into search matching. tiktok and instagram have never published how much caption text actually counts, so treat the search words as cheap insurance rather than a guaranteed boost.
character limits can change without notice
the numbers here reflect the limits at the time of writing, tiktok at 4,000 in the app and roughly 2,200 through scheduling tools. check inside the app if a longer caption gets cut off.
it writes captions, not comments
a pinned first comment is a separate spot with its own purpose, usually a link or a follow-up question. this tool stays focused on the caption itself.
long enough to remind people of the promise and ask for one thing, which is usually well under 150 characters even though tiktok allows up to 4,000. extra length only helps if it adds search words people would really type, which is what the search-ready version is for.
because on youtube the part that shows next to a short is the title, capped at 100 characters, while the 5,000 character description sits behind a tap. the quick version is written to fit the title without getting cut off mid word.
either works for reach, but on tiktok and instagram they count against the same character limit as your caption. this tool leaves them out so your caption text isn't competing with a block of tags for space.
asking for one specific, answerable thing does. a generic what do you think gets you nothing, while naming the disagreement in your video gives people a sentence they can write right away. that's why the ask is a setting here, not an afterthought.
the everyday version usually works for both tiktok and reels. shorts needs the quick version because of the title limit, so plan on writing two versions, not three.
youtube descriptions get indexed by youtube search and can show up in google results. on tiktok and instagram, caption text is searchable inside the apps, but how much of it reaches outside search engines is not something either company has explained.
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