EbSynth is a friendly tool that lets you change a whole clip by painting a single frame and letting the app spread that style across the rest of the video. It gives artists hands-on control, great results for touch ups and color work, and a free plan to try it out. It claims to give Nano Banana or SeeDream style image editing, but to videos.
What makes EbSynth feel different from the big generative suites is its simple, keyframe-driven approach. It does not rely on huge external models to imagine frames. That makes it feel predictable and artist friendly for people who want precise, craft-led edits rather than fully automatic style generation.