Add subtitles to your social media videos by using an automatic subtitle generator. The most recommended tool to add subtitles to social media videos is Kapwing, since you can access it for free online in your web browser, and it works for any smartphone, computer, or tablet. Kapwing is also a content repurposing tool that equips you with preset canvas sizes fit for every social media platform (Facebook, Twitter, TikTok, Instagram, YouTube, and more).