Kling 4.0 is a web-based AI video generation service that transforms natural-language prompts and optional reference media (images, short clips, audio) into ready-to-publish videos. It supports text-to-video and image-to-video workflows, multi-shot storytelling, native high-resolution rendering, and built-in audio generation and lip-sync. Users can iterate prompts, batch-generate assets, and download outputs in multiple aspect ratios for social, e-commerce, and marketing use. Paid plans unlock priority queueing, higher resolutions, batch generation, API access, commercial licenses, and watermark-free exports.