Video input
Uploaded videos continue from their last frame. History clips use the provider's native extend task.
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AI video extender guide
An AI video extender generates new frames after the final frame of an existing video. Uploads create a separate Grok Imagine 1.5 video segment from the last frame; eligible History clips use the provider native extend task.
Kie documents that native Grok extension requires the original provider task ID. Uploaded files therefore use this page's separate last-frame generation workflow. Model behavior and estimates last verified July 23, 2026.
Upload or choose a video| Video input | Upload a video or choose an eligible completed Grok clip from History |
|---|---|
| Upload formats | MP4, WebM, or MOV; maximum file size 100MB |
| Added duration | 6 or 10 seconds after the original ending |
| Upload output | A separate 480p video segment generated with Grok Imagine 1.5 |
| Current upload estimate | 50 credits for 6 seconds; 80 credits for 10 seconds |
| History estimate | Shown live; model, resolution, and audio can change it |
| History requirement | A completed Grok clip with its original provider task ID |
| Last updated | July 24, 2026 |
Use cases and examples
The racing example tests fast-motion continuity. The salt-lake example tests a wide-to-close character reveal. The perfume example tests whether a product action can finish with enough room for an ad ending.
When to use it
Use the extender when the opening footage already works but the shot ends before a specific editing job is complete. Choose the missing job first, then decide whether 6 or 10 added seconds gives the action enough time to resolve.
The extender can finish a shot that ends while a car is drifting, a person is turning, a door is opening, or a camera is still pushing forward. Request one next action, then inspect speed and body position across the join.
A social edit may end before its spoken line, subtitle, or hook is complete. A controlled hold, slow pullback, or ambient movement can keep the frame active while the remaining message finishes.
A perfume spray or product reveal may land correctly but leave no room for a CTA. AI video extension can complete the gesture, settle into a product hold, or create an exit while preserving copy-safe space.
AI can extend a distant landscape or room view toward a person or object. The added shot creates a wide-to-close progression without discarding the opening composition.
A continued pan, orbit, pullback, walk-away, or vehicle movement can reach a cleaner cut point. The added seconds provide a transition plate; they do not guarantee that every generated join will be invisible.
What the tool does
The model generates new frames after an original clip. Eligible Grok History videos use the provider native extend task. Uploaded videos use their extracted last frame to start a separate Grok Imagine 1.5 segment. It does not slow, duplicate, or loop existing frames.
Start with an MP4, WebM, or MOV from your camera roll, or choose a completed Grok clip from History. Upload mode reads the final frame; History mode preserves the original Kie task ID for native extension.
Write what happens after the visible ending: the car keeps drifting, the person turns toward camera, the bottle stays in a hero hold, or the camera reveals the wider landscape. A concrete next beat is more useful than repeating the entire original prompt.
Use +6 seconds for one reaction, gesture, reveal, or transition. Use +10 seconds when the action needs to resolve or the ad needs room for a CTA. The selected duration is visible before you submit.
Compare the original video and extended result side by side. Check car speed, body position, face and hands, product edges, reflections, horizon lines, and ambient sound before downloading the result.
The generated segment is saved to your account after the async job completes. Place an uploaded result after the original video in your editor; a native extension remains connected to its History record.
Video extension controls
Choose the input method, next action, and missing duration before generation. AI Video Extender continues forward from the clip ending. It does not provide backward extension, two-way extension, exact target length, batch processing, or guaranteed seamless loops.
| Control | Available setting | What to check |
|---|---|---|
| Input video | Upload MP4/WebM/MOV or choose an eligible History clip | Use upload for filmed or exported footage; use History for native Grok extension. |
| Next-scene prompt | Subject, next action, camera movement, setting, mood | Write forward from the final moment; do not repeat the whole original prompt. |
| Added length | +6 seconds or +10 seconds | Use 6 seconds for one beat; use 10 seconds for a fuller action or CTA hold. |
| Motion direction | Forward extension from the final frame | Describe the next camera or subject movement in the same direction where possible. |
| Format | History keeps original settings; upload uses Grok 1.5 at 480p | Review framing and safe areas in the original and extended result together. |
| Audio and continuity | Provider-generated audio and motion | Listen for changes in ambience or dialogue before using the result in a final edit. |
How it works
AI Video Extender uses four steps: upload or choose a video, describe the next useful beat, choose 6 or 10 seconds, and inspect the join. Uploaded footage and History footage use different model inputs, but both return to the same comparison panel.
Upload an MP4, WebM, or MOV up to 100MB, or switch to History and choose an eligible completed Grok clip. The uploaded file stays in the workbench draft across login.
Write a prompt that begins at the original ending. Explain the next movement or camera beat instead of repeating the entire first scene.
Select 6 seconds for one missing beat or 10 seconds for a fuller action and check the displayed credit estimate before generation.
History clips use native Grok extension. Uploaded clips generate new footage from the extracted last frame. Compare the original and result, then download after checking the join.
Prompt examples
A next-scene prompt should begin where the video ends. These examples describe one next action, preserve camera direction where possible, and include a concrete review cue.
| Use case | Next-scene prompt | Setting | Expected result |
|---|---|---|---|
| Person action | The subject opens the studio door and steps into the warm light beyond it, with the camera following in one smooth movement. | 6 seconds · match the existing camera direction | A resolved action beat instead of a clip that stops at the setup. |
| Camera movement | The camera keeps orbiting to the right while the character turns toward the window; preserve the same pace, lighting, and composition. | 6 seconds · keep motion continuous | A motion bridge that can connect to the next shot. |
| Product advertisement | Continue the slow pullback and hold on the product as the light sweeps across its surface, leaving clean space for a short CTA. | 10 seconds · review logo and safe area | Extra room for an end card, caption, or voiceover. |
| Environment reveal | The camera moves past the foreground leaves to reveal the wider landscape, keeping the same golden-hour color and gentle wind. | 10 seconds · check background geometry | A longer establishing beat without recreating the opening shot. |
| Quiet outro | Let the subject settle into a natural pause, keep the ambient movement subtle, and hold the final composition for a clean fade out. | 6 seconds · inspect audio and stillness | A calmer ending for a short film, social post, or presentation clip. |
Consistency checklist
Generative video extension cannot guarantee an exact match. A clear final frame and one narrow next action make identity, motion, lighting, and audio continuity easier to direct and review.
The final moment should have a readable subject, action, and camera direction. Ambiguous endings give the generated scene more room to drift.
Ask for one primary action in the added seconds. Several unrelated actions can make timing, identity, and camera continuity harder to inspect.
Name the next pan, push, orbit, pullback, or hold. Matching the existing movement is usually easier to review than changing direction without a transition.
Compare face, hands, wardrobe, product details, lighting direction, and color temperature across the join. Generative video can change any of them.
Listen for ambience, dialogue, music, and abrupt changes. The extender does not promise a frame-perfect or audio-perfect match.
Extender vs. alternatives
An AI video extender creates new visual content after the original clip. Looping repeats existing frames, slow motion changes playback speed, and editing rearranges or modifies existing footage. Choose the operation that matches the missing timeline job.
| Your need | AI Video Extender | Better alternative |
|---|---|---|
| Continue the same generated scene | Use a completed Grok clip from History for native extension. | Best fit for this page. |
| Repeat a segment in a loop | Creates new content, not a frame-perfect loop. | Use a video editor or loop tool. |
| Make the existing clip play slower | Adds generated content instead of changing playback speed. | Use a speed or retiming tool. |
| Change an object or style in the original video | Does not replace the video edit workflow. | Use Video Editor, then extend the saved result. |
| Extend an arbitrary uploaded MP4 | Upload the clip and generate a new segment from its last frame. | Join the original video and added segment in your timeline after review. |
Frequently asked questions
Five direct answers cover the definition, upload requirements, model paths, online access and credits, and the quality checks that matter before publishing.
An AI video extender generates new frames after the final frame of an existing video. It creates new visual content rather than slowing, duplicating, or looping existing frames. Eligible Grok History clips use native extension; uploaded videos start from their extracted last frame.
AI Video Extender accepts MP4, WebM, and MOV uploads up to 100MB. The browser reads the uploaded video and extracts its final frame before generation. A completed Grok clip can also be selected from History when its original provider task ID is available.
Uploaded videos use their extracted final frame as the start frame for Grok Imagine 1.5 image-to-video generation. Eligible History clips use Kie native grok-imagine/extend with the original provider task ID. An uploaded result is a separate segment to join after the original footage in an editor.
The workbench can be opened and configured online, but this is not a free AI video extender for completed generations. As of July 23, 2026, uploaded-video estimates are 50 credits for 6 seconds and 80 credits for 10 seconds. History cost depends on the selected clip settings and is shown before generation.
AI video extension cannot guarantee an exact identity, motion, lighting, or audio match. Use a clip with a clear final frame, request one next action, preserve the existing camera direction, and compare faces, hands, product details, ambience, and movement across the join before publishing.
Upload a video to generate a separate segment from its last frame, or use the native provider task for an eligible Grok History clip. Review the join before downloading.
Extend video with AINeed to create a video first? Use the Grok video generator or image-to-video. Review saved work in History and compare credit options. When the timing is right, upscale the extended video before delivery.
