AI Video Extender
MP4 / WEBM / MOV / WMV · ≤ 50 MB
What is AI Video Extender?
AI Video Extender generates a continuation from an existing video and your prompt. It supports Wan 3.0, Wan 3.0 Prime, Kling 4.0, and Seedance 2.0/2.5. Reuse a video from My Creations or upload your own, then choose the model, duration, and resolution available in the form.
Frequently Asked Questions
Learn how to choose a model, upload a video, and create a continuation.
How do I extend a video?
Upload a video, or choose Use → Extend video on a video in My Creations. Describe what should happen next, choose the model, extension length, and resolution, then select Create.
Which video files can I upload?
You can upload one MP4, WEBM, MOV, or WMV video up to 50 MB. You can also reuse a completed video from My Creations. The selected model may have additional requirements for the source video.
How many seconds can I add?
Choose a whole number of seconds: Wan 3.0 and Wan 3.0 Prime support 2–30 seconds, Kling 4.0 supports 3–30 seconds, Seedance 2.0 supports 4–15 seconds, and Seedance 2.5 supports 4–30 seconds. The default extension length is 5 seconds.
Which model is selected when I reuse or upload a video?
Use → Extend video selects the matching extension model for videos generated with Wan 3.0, Wan 3.0 Prime, Kling 4.0, or Seedance 2.0/2.5. Local uploads and videos from other models default to Wan 3.0. You can change the model before creating the extension.
How are extension credits calculated?
Credits depend on the model, resolution, extension length, and number of results. Seedance 2.5 also includes the source video duration, counted as at least 2 and at most 30 seconds per result. Check the displayed credit total before selecting Create.
Which output resolutions are available?
Wan 3.0 and Wan 3.0 Prime support 480p, 720p, and 1080p. Kling 4.0 supports 720p and 1080p. Seedance 2.0 and 2.5 support 480p, 720p, 1080p, and 4K. The form shows the options available for the selected model.
Where can I find my extended video?
Your task and its status appear in My Creations. Once the task is complete, you can preview and download the result there.