What is a caption?

Also called post caption, Instagram caption, post copy.

A caption is the text that goes with a social media post, shown with the photo or video, used to explain it, add context, show your personality and tell people what to do next.

Why it matters

Most people look at the picture first and read the caption second, and the caption is where a nice photo becomes a reason to comment, save, book or buy. It also holds the words people search for on apps with search, such as Instagram, TikTok and Pinterest. A clear caption in a consistent voice makes even a simple photo work harder.

Example

A florist posts a bridal bouquet. A weak caption says "Lovely flowers today!" A stronger one says "Peonies, garden roses and eucalyptus for a July wedding. We're booking autumn weddings now: tap the link in our bio to check your date."

How to write a good caption

A good caption does one job well. Decide what you want the reader to know or do before you start typing.

  1. Open with the point. Most apps cut a caption off after a line or two with a "more" link, so put the news, the benefit or the question first.
  2. Say what the picture can't: the price, how it's made, who it's for, or the story behind it.
  3. Write the way you'd talk to a customer at the counter, in your usual brand voice.
  4. Break longer captions into short paragraphs or a short list so they're easy to read on a phone.
  5. End with one call to action: comment, save, book, visit, or tap the link.
  6. Add a few relevant hashtags or @mentions only where they help people find or understand the post.
  7. Read it once on your phone before posting, and check spelling, prices and dates.

Caption length limits by platform

These are the most you can type in a single post's main text. What people see before the "more" link is far shorter, so the first line matters most wherever you post.

  • Instagram: up to 2,200 characters
  • TikTok: up to 2,200 characters
  • LinkedIn: up to 3,000 characters
  • X: 280 characters per post on a standard account
  • Threads: 500 characters per post
  • Pinterest: up to 500 characters for a Pin description
  • YouTube: up to 5,000 characters for a video description
  • Google Business Profile: up to 1,500 characters for an update

Common caption mistakes

Most weak captions fail in the same few ways, and each is quick to fix.

If writing captions every week is the part you never get to, Zolyp's Create feature writes the caption, designs the visual and adds hashtags in your saved brand voice, for you to review before anything goes out.

  • Describing what the photo already shows instead of adding something new.
  • Hiding the offer or the date at the end of a long block of text.
  • Pasting the same caption everywhere, including hashtags and @handles that don't exist on the other platform.
  • Asking for three things at once (like, share and click) so people do none of them.
  • A wall of hashtags in the middle of the text.
  • Leaving out the basics people need to act: price, location, opening times or how to book.

Caption or subtitle?

On video, "captions" can also mean the words of the soundtrack shown on screen, often called subtitles or closed captions. They help people who are deaf or hard of hearing and anyone watching with the sound off. A post caption is the text under the post; on-screen captions are part of the video itself. Most short videos benefit from both.

Common questions

How long should a social media caption be?

As long as it needs to be and no longer. One line suits a strong photo or a quick update; a few short paragraphs suit a story, a how-to or a launch. Whatever the length, make the first line count, because that is often all people see before they tap "more".

Should hashtags go in the caption or the first comment?

Both are common. Putting them at the end of the caption keeps everything in one place, while a first comment keeps the caption tidy. Wherever they go, a few relevant tags are more useful than a long list of broad ones.

Can I use the same caption on every platform?

You can reuse the idea, but adjust the wording. X allows far fewer characters than Instagram or LinkedIn, hashtags and @handles differ between apps, and a LinkedIn audience expects a different tone from TikTok.

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