Synthesia is an AI tool that turns your written script, slides, or web pages into videos with computer-made presenters. You type or paste what you want to say, pick a digital person and a voice, and it makes a ready video, no camera or actors needed. It works in many languages and lets you add your logo, colors, and fonts so videos match your brand. You can upload PowerPoint slides, use ready templates, or upload a spreadsheet to make many personalized videos at once. Synthesia is made for teams that need to make lots of clear videos fast for training, marketing, or company messages.