Captions Generator

Captions Generator is an online AI caption and subtitle generator that runs in the browser. Drop in a video, audio file, or existing SRT file, and get word-timed captions in seconds in any of 100 languages. You can fix any word, style the captions, translate them, and export captioned MP4s or SRT, VTT, and TXT subtitle files. No installation or sign-up is needed.

Who it is for

It’s for people who publish short and long videos and need readable captions quickly: creators making TikToks, Reels, and YouTube Shorts; marketers producing UGC ads; teachers and course makers who need subtitle files for lessons; and podcasters who want a transcript or an SRT for each episode. It also suits anyone with a subtitle file in one language who needs it in another.

How it works

Upload a video or audio file. The speech language is detected automatically, so you don’t need to set a language. The editor opens with the captions laid out on a timeline under the video, each word timed to the speech. Click a line to correct a word, merge two lines, or drag a line’s edges to adjust its timing; a waveform under the captions shows where speech starts and stops.

Then choose a look. There are 22 caption styles, and you can change the font, color, size, and position, add up to three hook titles or text overlays on the video, and, on vertical videos, switch on a safe-zone guide for Instagram Reels, Stories, TikTok, or YouTube Shorts so the captions stay clear of the app’s buttons. You can also copy a style from a screenshot of captions you like.

Finally, export. The browser renders the MP4, and the subtitle files download as SRT, VTT, or TXT.

An example

A creator records a 90-second vertical clip that mixes English and a few Chinese phrases. They upload it; the captions appear with each word timed; they correct a brand name the AI misheard, pick a bold style with one highlighted word per line, turn on the TikTok safe zone to keep the text above the caption bar, and export the MP4. If they also want Spanish subtitles for YouTube, the Translate tab produces them, and they download a separate SRT.

Privacy

The video itself stays on your device. Only the audio track is sent to the speech-recognition service for transcription, and the service does not store it.

Pricing

The free plan covers videos and subtitle files up to 30 minutes each, MP4 export in 1080p with a small watermark, SRT, VTT, and TXT downloads, and free translation of captions or your own SRT files into more than 100 languages. Pro costs $9.99 a month (currently $6.99 for a limited time) or $59 a year, with a 14-day money-back guarantee. Pro removes the watermark and adds 90-minute videos, 4K export, word animations such as karaoke, bilingual captions, AI keyword highlights, and custom fonts.

Limits users should know about

Free videos are limited to 30 minutes each and Pro videos to 90 minutes, so longer recordings need to be cut first. Imported SRT files have no word-level timing, so word animations work only on captions the AI created. Exporting long MP4s is fastest in Chrome or Edge, because they can stream the file straight to disk. As with any speech recognition, names, jargon, and heavy background noise may need manual correction before you export.