Subsvideo

Drop a video into your browser tab and Subsvideo returns captions you can style before exporting. Subsvideo is a free AI caption generator and subtitle tool that turns speech into on-screen text, with templates, fonts and animations to change how the words look.

It supports multiple languages and handles 4K video.

The processing runs locally in the browser, so your footage is not sent off to a server, which matters if the video is private or unreleased.

Usage is unlimited, and there are no watermarks or sign-up steps in the way.

The catch is scope.

Subsvideo only generates captions, so it is not a video editor, and you will need another tool for trimming or effects.

Because the work happens on your own machine, speed depends on your browser and hardware, and an up-to-date browser is the safer choice for full compatibility.