# AI Video Extender

> An AI video extender takes an existing clip and generates new frames that continue its motion, framing and light, so the result plays as one longer take, not a loop. In Kenerate's video studio you upload the video, write what happens next and pick a model: Wan 3 adds 2 to 30 seconds at up to 1080p with sound, Seedance 2.5 extends clips of 4–30 s at up to 4K, Veo 3.1 adds a fixed 7 seconds, and LTX 2.3 adds up to 20 seconds. Chain extensions for longer shots. A prompt is required — it tells the model what the continuation should show.

URL: https://kenerateai.com/ai-video-extender
Publisher: Kenerate AI (https://kenerateai.com)
Last updated: 27 September 2026

## Key facts
- Wan 3 adds: 2–30 s
- Top resolution: 4K · Seedance 2.5
- Veo 3.1 adds: 7 s per step
- Models with extend: 17
- Wan 3 (Alibaba): Your video + prompt → +2 to 30 s · 480p–1080p · sound. Long continuations with sound.
- Wan 3 Prime (Alibaba): Your video + prompt → +2 to 30 s · 480p–1080p. Wan 3's higher-quality tier.
- Seedance 2.5 (ByteDance): 4–30 s video + prompt → 4–30 s · up to 4K. Highest resolution continuations.
- Seedance 2.0 (Fast, Mini) (ByteDance): 4–15 s video + prompt → Up to 15 s · up to 4K. Seedance 2 quality.
- Veo 3.1 / 3.1 Fast (Google): Your video + prompt → +7 s · 720p or 1080p. Fixed 7-second steps.
- LTX 2.3 (Lightricks): Your video + prompt → +1 to 20 s · keeps 720p. Long steps at the source resolution.
- Wan 2.7 (Alibaba): Your video + prompt → 5–15 s total · 720p or 1080p. Short, sharp continuations.
- Happy Horse 1.1 (Alibaba): Your video + prompt → Up to 15 s total · 720p or 1080p. Clips with native audio.
- Grok Imagine (xAI): Your video + prompt → +6 or 10 s · 720p. Quick fixed-length steps.

## Steps
1. Open the video studio — Pick Extend and a model that supports it — Wan 3 is the default.
2. Upload your clip — Any MP4. Seedance 2.0 needs 4–15 s and Seedance 2.5 4–30 s of input.
3. Describe what happens next — One line: 'the train enters a tunnel', 'she rides out of the wave'. A prompt is required.
4. Pick how much to add — 2–30 s on Wan 3, 7 s on Veo 3.1, up to 20 s on LTX 2.3 — then extend again if you need more.

## In depth

### How extension works
The model reads the end of your clip — the last frames, the subject, the camera move — and predicts what comes next from your prompt. Google describes Veo's version as finalizing the last second of the video and continuing the action; each Veo step adds 7 seconds.

### Extend vs generate a new shot
Extend when the same shot should keep going: a train crossing, a surfer riding the wave, a drone move. Generate a new clip when you want a different angle — editors cut between shots rather than stretching one forever.

### Chaining extensions
Extend, check the result, and extend again from the new ending. Google's Veo API allows up to 20 extensions for a maximum of 148 seconds; Kling's own extender goes up to 3 minutes in 4–5 second steps.

## FAQ
Q: What is an AI video extender?
A: A tool that continues an existing clip: it generates new frames that carry on the motion, framing and light from the end of your video, so the result plays as one longer shot.

Q: How much can I add at once?
A: On Kenerate: 2–30 seconds per step on Wan 3, 7 seconds on Veo 3.1, up to 20 seconds on LTX 2.3, up to 30 seconds total on Seedance 2.5. Chain steps for longer shots.

Q: Can I extend a video that wasn't made with AI?
A: In Kenerate's studio you can upload any MP4 as the source. Google's own Veo API only extends Veo-generated videos, so results depend on the model you pick.

Q: Why does my extended video jump or cut?
A: Usually the prompt asks for something new. Kling notes that a prompt unrelated to the original subject may cause a cut — describe a continuation of the same action.

Q: Does the extension keep the sound?
A: Wan 3 and Seedance generate sound for the new part; pick them when the clip needs audio.

Q: What resolution is the extended video?
A: It depends on the model: up to 1080p on Wan 3, up to 4K on Seedance 2.5, and LTX 2.3 keeps the source resolution.

Q: Is the AI video extender free?
A: Video generation, including extend, runs on Kenerate's credit packs. The free sign-up credits work on image models, so you can make the start image first.

## Related pages
- Image to video AI: https://kenerateai.com/image-to-video-ai
- AI video generator: https://kenerateai.com/ai-video-generator
- AI motion control: https://kenerateai.com/ai-motion-control
- AI video upscaler: https://kenerateai.com/ai-video-upscaler

## Sources
- Kenerate video studio: https://kenerateai.com/app/video
- Google — Veo 3.1 video extension (Gemini API): https://ai.google.dev/gemini-api/docs/veo
- Kling — AI video extension guide: https://kling.ai/quickstart/ai-video-extension
- WaveSpeed — Wan 2.7 video extend: https://wavespeed.ai/models/alibaba/wan-2.7/video-extend