For captioning vertical short-form clips — the text stays inside the 9:16 safe area so nothing is clipped by the platform UI.
Vertical video is watched muted, so on-screen text does the talking. This tool lets you add timed captions to a 9:16 clip right in your browser: drop text cards on the timeline, set each one's start and end by dragging, and preview them live over your footage. The three built-in styles — bold centered pop, lower-third caption, and step-counter chip — are all kept inside the 9:16 safe area so they don't collide with the platform's own buttons and captions. Export burns the text in as a real MP4 or WebM at 9:16, encoded entirely on your device with no upload and no watermark. It's the fast way to turn a silent screen recording or demo into a captioned Reel or Short.