TikTok Caption Generator

From a description

1. Say what the video is about in a sentence or two. Name the topic, the place or the product — the tool only uses what you write.
2. Pick a tone, a length and how many hashtags you want.
3. Click Write 3 captions. After a few seconds you get 3 different options.
4. Click Copy on the one you like and paste it into TikTok. Not quite right? Change a setting and click Write 3 new captions.

From a video link

1. Pick Use video link and paste the link to a public TikTok, YouTube Short or Instagram Reel.
2. Add a note if you like, for example "mention the recipe in my bio".
3. Click Write 3 captions. The tool first turns the speech into text, which takes 15–45 seconds, then writes the captions from it.

A link uses one video from the same allowance as our TikTok transcript tool. On the free plan that is 1 video every 30 days, plus 1 more when you sign in, and the tool reads the first minute of it. New captions for the same link do not use another video, as long as you do not reload the page. Open Show the transcript we used to see exactly what it read.

These came straight from the tool on 26 September 2026, with the settings shown. Each click gave 3 captions; we show one and did not edit it.

Look at the pen example. In the video, the reviewer says the pens do not smudge and suit left-handed writers, and the caption uses exactly that. A caption written from the video picks up details that a one-line description would miss.

Lengths are targets the AI aims for, not hard cuts, so a caption can land a little over or under. In our tests on 26 September 2026, short captions came out at 51–93 characters, medium at 99–170 and long at 233–238. Japanese captions were shorter, as they should be: each character carries more.

• A hook first. The first line is the one people read first, so it should give them a reason to keep watching. Every caption this tool writes starts with one.
• Say what the video is about. Plain words like "banana pancakes" or "first marathon" tell people what they are about to watch.
• A few specific hashtags. #bananapancakes says more than #food. The tool puts the most specific tags first.
• One ask. A question at the end, like "What's your favorite topping?", gives people something to reply to. Turn on End with a question.
• Sound like you. Pick the tone closest to how you talk in the video, then change a word or two so it is yours.

TikTok's developer guide for posting through its API sets the caption limit at 2,200 characters. It counts them in UTF-16 units, and the counter under each caption counts the same way. We could not find the limit for the TikTok app in TikTok's help center. So the tool keeps every caption, hashtags included, inside 2,200.

You will rarely get near it. In our tests, the longest full caption, hashtags included, was 382 characters.

The AI only knows what you tell it, or what is said in the video. It is told not to invent facts, prices, names or links. It can still stretch or slip. In our tests it once turned "starting from zero" into "from couch to marathon", and once made up a pen model name before we tightened its rules. So read the caption once before you post it, and check that:

• names, products and numbers are right;
• it does not promise something your video does not show;
• hashtags are spelled right. In a Spanish test, one came out as #cocinaparprincipiantes, not #cocinaparaprincipiantes.

A set is 3 captions. When you reach a limit, the tool tells you when it resets instead of just failing. Pro is billed through our pricing page; the caption writer itself has no paid add-on.