Auto subtitles for TikTok, Reels, Shorts and YouTube

AI Caption Generator

Add animated, word-by-word captions to any video automatically. Upload a clip, the AI transcribes it and burns on trendy styled subtitles, the kind that boost retention on TikTok, Reels and Shorts. No manual timing, no editing software.

Automatic transcriptionAnimated caption stylesAuto-detects the languageWorks on any video

Add captions to your video

Upload a video, pick a caption style, and let the AI do the timing. You can fine-tune everything in the editor after.

Upload your video

Drop your video here or click to browse
MP4, MOV, WebM — up to 150 MB

Caption style

Cost: 2 credits

Sign in to generate. Free credits included on signup.

Tap for sound

Captions added automatically. No editing.

How the caption generator works

01

Upload your video

Drop in any clip you want captioned, an MP4, MOV or WebM. It can be footage you filmed, a talking head, a podcast clip or an AI-generated video.

02

AI transcribes it word by word

The AI transcribes the audio and matches every caption to the exact moment it is spoken, word by word. It auto-detects the language, so there is nothing to configure.

03

Pick a style and download

Choose from animated caption styles, then download the captioned video. Want to tweak the wording, colors or timing? Open it in the editor and fine-tune.

Why creators use this video caption generator

Automatic transcription

The AI listens to your video and writes out every line for you. No typing the words yourself, no scrubbing the timeline to line them up.

Animated, word-highlight styles

Not static subtitles. Each word pops as it is spoken, the retention-boosting style you see on top TikTok, Reels and Shorts creators.

Auto-detects the language

English, Spanish, French, German, Portuguese and many more are detected automatically and captioned in the right language.

Works on any video

This is not limited to AI-generated content. Caption anything you upload: your own footage, interviews, clips, gameplay or webinars.

No manual timing

The hardest part of captioning is the sync. The AI handles it, so captions land on the exact word every time.

Ready in about a minute

Upload, pick a style, and get a captioned video back fast. Then post it anywhere or keep refining in the editor.

Who the AI caption generator is for

Short-form creators

Add the caption style that keeps viewers watching to TikToks, Reels and Shorts in seconds.

Faceless and clip channels

Caption repurposed clips and faceless videos at scale without touching an editing timeline.

Podcasters and interviewers

Turn long talking clips into captioned shorts so people can watch on mute and still follow along.

Educators and marketers

Add clear captions to explainers, ads and course clips to lift retention and accessibility.

Why creators use this instead of captioning by hand

StoryShortDoing it yourself
TranscriptionAI transcribes the whole video for youType out every line by hand
TimingSynced to the exact word automaticallyDrag each caption to line it up
StyleAnimated, word-highlight caption stylesPlain static subtitles
LanguagesAuto-detected and captionedSet the language manually
SoftwareNothing to install, runs in the browserA paid editor and a learning curve
Time per videoAbout a minute20 to 40 minutes

What is an AI caption generator?

01

An AI caption generator is a tool that adds subtitles to a video automatically. Instead of typing out every line and dragging each one to line up with the audio, you upload a clip and the AI transcribes the speech, times it word by word, and burns styled captions straight onto the video.

02

StoryShort's video caption generator is built for short form. It matches captions to the audio word by word and renders them in animated, word-highlight styles, the kind that keep viewers watching on TikTok, Reels and Shorts. It auto-detects the language, so the same tool captions English, Spanish, French, German, Portuguese and more without any setup.

03

Because most social video is watched on mute, captions are one of the highest-leverage things you can add to a clip. This works on any video, not just AI-generated ones, so you can caption your own footage, interviews, podcast clips and gameplay, then fine-tune the wording, colors and timing in the editor before you post.

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Captions on any video, automatically

Upload a clip and let AI handle the transcription, the timing and the animated caption styles so you can post captioned video every day.

Synced word by word

The AI transcribes your video and lands each caption on the exact word it is spoken, no manual timing.

The styles that perform

Animated, word-highlight captions in the styles top creators use to hold attention on TikTok, Reels and Shorts.

Frequently Asked Questions

What is an AI caption generator?

It is a tool that adds subtitles to a video automatically. The AI transcribes the audio, matches each caption to the moment it is spoken word by word, and burns styled captions onto the video, so you never type or time anything yourself.

How accurate is the transcription?

Very accurate on clear audio. The AI uses a strong speech-to-text model, so captions closely match what is said. If you ever want to tweak a word, you can edit the text before you download.

What languages are supported?

The generator auto-detects the language of your video and supports many, including English, Spanish, French, German, Portuguese and more. There is nothing to set, upload the clip and it captions it in the right language.

Can I customize the caption style?

Yes. Pick from a range of animated caption styles before you generate, then open the result in the editor to adjust the font, colors, size, position and wording so it matches your brand.

Do captions actually help with views and retention?

Yes. Most social video is watched with the sound off, so captions let people follow along on mute. Animated, word-by-word captions in particular are shown to hold attention through the first few seconds, where most viewers drop off.

Is it free?

You get free credits when you sign up, so you can caption your first videos at no cost. Generating a captioned video uses credits, which are included on the paid plans.

Add captions to your video in about a minute

Upload a clip, pick a style, and get animated captions synced word by word. Free to start, no editing software.

Add captions to your video