EbSynth

EbSynth's pitch is unusually honest: paint one keyframe well instead of a hundred in a hurry, then let propagation carry it across the timeline. The site is explicit that the propagation 'doesn't use AI' — it's a texture-synthesis algorithm that only uses your video and keyframes, with no generative models trained on external datasets. That matters to artists who have watched generative tools drift, smear, or hallucinate detail between frames. Strengths. The workflow is genuinely frame-precise, so the result stays anchored to the performance you shot. The site's own FAQ documents a practical multi-track method: divide a shot into parts that move independently and need different keyframe timing — background, face, eyes — and work on each in a separate video track using keyframes on a transparent background with alpha channels (eye corrections are the given example). Keyframe timing guidance is concrete: pick frames that show the most content and clear poses, not the middle of movements, and align keyframe shapes to the video's shapes or you get stretchy, ripple-like artifacts. The one AI feature, 'Generate Image,' generates keyframes as a starting point, and the site suggests painting over its artifacts and re-running at lower strength. Weaknesses. Propagation quality depends entirely on optical flow calculated from your guiding video, so the tool pushes requirements back onto the shoot: soft diffuse lighting to avoid hard shifting shadows, textured clothing (shiny or flat materials are hard to track), and higher frame rates for fast movement. None of this is automatable. And 'Generate Image' will not rescue a badly aligned keyframe. Where it fits. Animators turning live performance into hand-drawn animation, VFX artists doing digital makeup and touch-ups without manual tracking, and colorists colorizing black-and-white footage. The pricing structure is straightforward: Free covers all core functions at 720p MP4 export, Pro at $20/month adds 1080p and 4K exports, PNG with alpha output, and priority processing, and Studio at $200/month/seat runs EbSynth locally as a Windows desktop app so footage never leaves your machines — NDA-friendly and fully offline. Chrome is recommended because it handles memory-intensive processing most reliably, and on laptops you should make sure it uses the dedicated graphics card. Where it doesn't. If you want a prompt-to-video generator, look at Runway or Pika instead. EbSynth is a tool for artists who want to own every pixel, and it asks for manual keyframe work in return.