Extend with Wan 3, Seedance, Veo 3.1 and more
AI Video Extender — extend any video with AI
Upload a clip, describe what happens next, and the AI continues it — same subject, light and camera — so a 5-second shot becomes one long take. Up to 30 more seconds per step on Wan 3.
- Continues your clip
- Up to +30 s per step (Wan 3)
- Up to 4K on Seedance 2.5
- Sound on Wan 3
Updated by the Kenerate AI team
Made with Kenerate
On this page
Quick answer
How do you extend a video with AI?
To extend a video with AI, upload the clip, write one line about what happens next, and an AI video extender generates new frames that continue its motion, framing and light — so it plays as one longer take, not a loop. In Kenerate AI's studio you pick one of 17 models: Wan 3 adds 2–30 seconds per step, and Seedance 2.5 works at up to 4K. The account is free; video runs on a credit pack, and downloads have no watermark.
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
- LTX 2.3 adds
- Up to 20 s
- Watermark
- None on downloads
- Price
- Free account · video on credit packs
Real results
Clips worth extending
Real 5-second Wan 3 clips — the kind of shot you'd extend into a longer take. Each started as one Seedream 5.0 Pro still.
How to
How to use the AI video extender
- Time needed
- Steps
- 4 steps
Step 1
Open the video studio
Pick Extend and a model that supports it — Wan 3 is the default.
Step 2
Upload your clip
Any MP4. Seedance 2.0 takes 4–15 s and Seedance 2.5 takes 4–30 s of input.
Step 3
Describe what happens next
One line: 'the train enters a tunnel', 'she rides out of the wave'. A prompt is required.
Step 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.
See it in the app
Open Video Studio in Text to Video mode and write the shot — subject, action, camera move and light.
Watch the tour · 1:19
Text, image & reference to video, models, edit, extend & chat
Chapters
Engines
Models that can extend a clip
All 17 models with an Extend mode in the video studio's own model list. Lengths marked + are added per step; the others are the finished clip. You can chain steps.
- Default
Alibaba
Wan 3
- Input
- Your video + prompt
- Output
- +2 to 30 s · 480p–1080p · sound
Open Wan 3Best for
Long continuations with sound
Alibaba
Wan 3 Prime
- Input
- Your video + prompt
- Output
- +2 to 30 s · 480p–1080p
Open Wan 3 PrimeBest for
Wan 3's higher-quality tier
ByteDance
Seedance 2.5
- Input
- 4–30 s video + prompt
- Output
- 4–30 s · up to 4K
Open Seedance 2.5Best for
Highest resolution continuations
ByteDance
Seedance 2.0
- Input
- 4–15 s video + prompt
- Output
- Up to 15 s · up to 4K
Open Seedance 2.0Best for
Seedance 2 quality
ByteDance
Seedance 2 Fast
- Input
- 4–15 s video + prompt
- Output
- Up to 15 s · up to 4K
Open Seedance 2 FastBest for
Faster Seedance 2 runs
ByteDance
Seedance 2.0 Mini
- Input
- 4–15 s video + prompt
- Output
- Up to 15 s · up to 4K
Open Seedance 2.0 MiniBest for
Lower-cost Seedance 2 runs
All models (17)
Google
Veo 3.1
- Input
- Your video + prompt
- Output
- +7 s · 720p or 1080p
Open Veo 3.1Best for
Fixed 7-second steps
Google
Veo 3.1 Fast
- Input
- Your video + prompt
- Output
- +7 s · 720p or 1080p
Open Veo 3.1 FastBest for
Cheaper 7-second steps
Lightricks
LTX 2.3
- Input
- Your video + prompt
- Output
- +1 to 20 s · keeps 720p
Open LTX 2.3Best for
Long steps at the source resolution
Alibaba
Wan 2.7
- Input
- Your video + prompt
- Output
- 5–15 s total · 720p or 1080p
Open Wan 2.7Best for
Short, sharp continuations
Alibaba
Happy Horse 1.1
- Input
- Your video + prompt
- Output
- Up to 15 s total · 720p or 1080p
Open Happy Horse 1.1Best for
Clips with native audio
xAI
Grok Imagine
- Input
- Your video + prompt
- Output
- +6 or 10 s · 720p
Open Grok ImagineBest for
Quick fixed-length steps
Kenerate AI
Kenerate Video
- Input
- Your video + prompt
- Output
- 3–15 s total · 720p or 1080p
Open Kenerate VideoBest for
Kenerate's own video model
Kenerate AI
Wan 2.6
- Input
- Your video + prompt
- Output
- +5, 10 or 15 s · 720p or 1080p
Open Wan 2.6Best for
Fixed 5/10/15-second steps
Alibaba
Wan 2.5
- Input
- Your video + prompt
- Output
- +3 to 10 s · 480p–1080p
Open Wan 2.5Best for
Low-cost short steps
ByteDance
Seedance 1.5 Pro
- Input
- Your video + prompt
- Output
- 4–12 s · 480p–1080p · sound on/off
Open Seedance 1.5 ProBest for
Budget Seedance continuations
ByteDance
Seedance 1.5 Fast
- Input
- Your video + prompt
- Output
- 4–12 s · 720p or 1080p · sound on/off
Open Seedance 1.5 FastBest for
Seedance 1.5 at Pro extend rates
The examples above were made with Wan 3 image to video from one prompt each. Extending runs in the video studio on a credit pack.
Tips
Extensions that don't jump
What keeps the continuation seamless.
Describe a continuation of the same action — a new subject can cause a cut.
Keep the camera move the same as the original clip.
Extend in steps and check each one before the next.
End the source clip on a clean frame, not mid-blur.
Use Wan 3 or Seedance 2.5 when you need sound in the new part.
For a new angle, generate a separate shot instead of extending.
Example uses
How creators use AI video extender
Illustrative examples of typical workflows, not customer reviews.
Travel videographer
A travel filmmaker can keep a sunrise balloon shot rolling as one long take instead of cutting away.
Music video director
A director can extend a short gallop along the beach into a longer tracking shot for the chorus.
Short-film maker
A filmmaker can continue an establishing shot by describing what happens next, keeping the same light and camera move.
FAQ
AI Video Extender questions
11 questions
What is an AI video extender?
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.
Link to this answerHow much can I add at once?
On Kenerate: 2–30 seconds per step on Wan 3, 7 seconds on Veo 3.1, up to 20 seconds on LTX 2.3, 4–30 seconds on Seedance 2.5 (from a 4–30 s clip). Chain steps for longer shots.
Link to this answerCan I extend a video that wasn't made with AI?
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.
Link to this answerWhy does my extended video jump or cut?
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.
Link to this answerDoes the extension keep the sound?
Wan 3 and Seedance generate sound for the new part; pick them when the clip needs audio.
Link to this answerWhat resolution is the extended video?
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.
Link to this answerWhat is the best AI video extender?
It depends on what you need. Wan 3 adds the most per step (2–30 seconds, with sound), Seedance 2.5 continues at up to 4K, Veo 3.1 adds fixed 7-second steps at up to 1080p, and LTX 2.3 adds up to 20 seconds at the source resolution. All 17 extend models run from the same upload, so you can compare.
Link to this answerIs the AI video extender free?
The account is free, but video generation, including extend, runs on Kenerate's credit packs, because every added second costs GPU time. The free sign-up credits work on image models, so you can make a start image first. Credit packs are one-time and never expire.
Link to this answerCan I extend a video with AI without signing up?
Not on Kenerate: extending needs a free account so your source clip, the extensions and your history stay in your library. Sign-in is one click with Google, GitHub or Discord.
Link to this answerDoes the extended video have a watermark?
No. Kenerate downloads carry no watermark on any model, so an extended clip can go straight into an edit, an ad or a post.
Link to this answerIs an AI video expander the same as a video extender?
People use both words, but they can mean two things. Extending adds time: the clip gets longer. Expanding (outpainting) adds frame area: a vertical clip becomes wide. Kenerate's extender adds time. To widen the frame, expand the start image with the AI image extender, then animate it with image to video.
Link to this answerIn depth
AI Video Extender, explained
On this page
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.
AI video extender free
Kenerate's account is free and has no watermark, but extending runs on a one-time credit pack. Draft cheap first: Wan 3 at 480p for a few seconds shows whether the continuation works before you add a long or 1080p step.
AI expand video vs AI extend video
Extend = more seconds of the same shot. Expand = a bigger frame around the same shot (outpainting), for example turning 9:16 into 16:9. Kenerate extends video in time; frame expansion runs on images, so expand the first frame with the AI image extender and animate that with image to video.
AI background extender for video
If you need more background around a subject, expand the still first — the image extender fills the new area to match the light and perspective — then make the clip from it. Extending an existing clip continues its action but keeps its framing.
How long can an extended video be?
Each step adds 2–30 seconds on Wan 3, 7 seconds on Veo 3.1 or up to 20 seconds on LTX 2.3, and Seedance 2.5 takes a 4–30 s clip and returns 4–30 s. Extend again from the new ending to go longer, checking each step before the next.
Explore
Every Kenerate video tool
Generators, tools, models and guides — all in one studio.
By the Kenerate AI teamLast updated and reviewed
Sources: Kenerate video studio · Google — Veo 3.1 video extension (Gemini API) · Kling — AI video extension guide · WaveSpeed — Wan 2.7 video extend
