AI video extender
AI Video Extender: keep any clip going with a prompt
Grok Video Extend takes a short clip and writes what happens next, picking up from the last frame. Our 5 second glass blowing shot got 6 more seconds for 16.5 credits.
We made a short clip, then extended it, and the tile above is the result: the original 5 seconds with the new footage joined on. Below you can watch each step, plus a second way to continue a shot on a different video model.
31.5 credits ($1.97) per clip. Included in every plan, from $10/month.
Already a member? Sign in
By Brian Lovett · Updated
More clips we extended
Each extended clip contains the original shot plus the new footage. The tiles show the prompt and the credits each run cost.
The 5 second clip we started from, made on Grok Imagine Video.
Dawn on a mirror flat alpine lake: a woman in her sixties in a cream fisherman sweater rows a wooden skiff through low drifting mist, each oar stroke leaving rings on the glassy water, snowy peaks reflected behind her, soft pink light.
Extended by 5 seconds: the mist lifts and the sun clears the peaks.
She lifts the oars and lets the skiff glide, the mist parts ahead and the first sunlight spills over the snowy peaks onto the water, a pair of ducks paddling past the bow.
The drone shot keeps flying and drops to the water behind the kayak.
The drone dives down toward the turquoise river and skims low over the water behind the small kayak as it rounds the bend between the towering red walls, spray glittering in the low sun.
The red kite lifts out of her hands and flies over the waves.
The red kite catches the wind, lifts out of her hands and climbs high over the breaking surf while she runs backward along the black sand letting out the line, the sun clearing the horizon.
How to extend a video with AI
- 1
Start with a short clip
Upload an MP4 or MOV, or make one first. We made our glass blowing shot on Grok Imagine Video at 720p, 5 seconds, for 7.5 credits.
- 2
Say what happens next
On Grok Video Extend, write the next beat as a prompt and pick how many seconds to add. We asked for the glassblower to lift the pipe and blow, and added 6 seconds.
- 3
Get one longer clip back
The output is your original clip with the new footage joined on, in one file. You pay 1.5 credits per second of that finished clip, so our run cost 16.5 credits.
- 4
Or continue on another model
Take the last frame of any clip and use it as the start frame of a new shot on WAN 3.0, Seedance 2.5 or Kling 4.0. Then join the two shots in Merge Videos.
One shot, extended two ways
The actual output of each step, with its settings and credits on the tile.
Close shot in a dark hot shop: a glassblower in his thirties with a leather apron turns a long steel pipe, a glowing orange bulb of molten glass at its tip, sparks of light off the furnace mouth behind him, heat shimmer, warm rim light.
He lifts the steel pipe to his lips and blows while turning it, and the glowing orange bulb swells into a round vase shape, sparks drifting from the furnace mouth behind him, heat shimmer in the dark.
He lifts the steel pipe out of the furnace light and rolls the glowing orange bulb along a steel table, it stretches into a long teardrop as sparks drift behind him. Warm rim light, heat shimmer. Sound: furnace roar, metal scraping.
- Grok Video Extend kept the same glassblower, apron, furnace and lighting across the join, so the extended clip plays as one continuous shot.
- The new footage followed the prompt: he raises the pipe to his lips and blows while the furnace throws sparks behind him.
- WAN 3.0 picked up from the last frame of the first clip and took the scene somewhere new, rolling the glass along a table, for 8 credits.
- Extending keeps one take. Continuing from the last frame lets you switch models and camera for the next shot.
Two ways to make a clip longer
| What you want | Grok Video Extend | Last frame as a new start frame |
|---|---|---|
| Same continuous take | Yes, the new footage joins onto your clip | A new shot that starts where the old one ended |
| What you get back | One file: your clip plus the extension | A separate clip to join in Merge Videos |
| Models | Grok Video Extend | WAN 3.0, Seedance 2.5, Kling 4.0 and other start frame models |
| What our run cost | 16.5 credits for 5 seconds plus 6 | 8 credits on WAN 3.0 |
Why we use an AI video extender on Pixel Dojo
Most AI video models make one short shot at a time. An extender lets you keep a take going instead of starting over, which is how we got the glassblower from turning the glass to blowing into it without a cut.
Pixel Dojo puts both methods in one place. Extend on Grok Video Extend, or take the last frame to any start frame model, then cut the shots together in Merge Videos. Every model page shows its price before you generate.
For a whole story told in scenes, Film Studio plans the shots, keeps your cast consistent and cuts the film for you.
What else you get on Pixel Dojo
Unlimited on every plan
On every paid plan, Relax runs Qwen Image 2.1, FLUX 3 Image Klein and MiniMax H3 Turbo, plus every video and photo effect, unlimited with no credits spent.
Sensei, the AI director
Describe a project and Sensei plans it, prices it, waits for your approval and reviews every take.
Photo effects
45+ photo effects restyle a picture in one click, from a hand painted anime still to a boxed action figure or a magazine cover, and every one starts from your own upload.
One job AI tools
35 single purpose tools each do one edit from an upload: remove a watermark, an object or text, restore and colorize an old photo, swap a background, retouch a portrait or make a thumbnail.
Character Studio
Save a face once and call it by @name in any prompt, so the same person shows up in every image and clip.
Start from a genre
Pick a format such as a UGC ad, a micro drama, a movie trailer or an explainer, and the matching studio opens with the settings and a sample idea filled in.
Credits that roll over
Your credits roll over while you stay subscribed, so nothing you pay for disappears at the end of the month.
Every top model, plus an API
More than 80 image and 60 video models in one account, with a public API and a hosted MCP server for your own apps and AI assistants.
What it costs to extend a video
Grok Video Extend charges 1.5 credits per second of the finished clip, the source plus the new footage. Our 5 second clip extended by 6 seconds cost 16.5 credits, and our 5 second extensions cost 15 credits.
Plans are Lite $10 a month for 160 credits, Pro $25 for 500 credits, Pro Max $50 for 1,100 credits. Every plan includes every model and commercial use. Any paid plan also makes unlimited MiniMax H3 Turbo clips of up to 5 seconds at 720p with no credits spent, so the clip you extend can cost nothing to make. Credits roll over while you stay subscribed.
Under our refund policy, a first purchase can be refunded within 7 days, in full if under 20% of the credits are used and pro-rated after that.
AI Video Extender questions
What is an AI video extender?
It is a model that takes a clip you already have and generates what happens next, starting from the last frame. On Pixel Dojo that model is Grok Video Extend: you give it a clip and a prompt, and it returns your clip with the new footage joined on.
How much does it cost to extend a video?
Grok Video Extend costs 1.5 credits per second of the finished clip. A 5 second clip extended by 6 seconds is 16.5 credits.
Can I extend a video I made somewhere else?
Yes. Upload any MP4 or MOV clip. Grok Video Extend reads its length before charging, and a file it cannot read is refused without a charge.
Can I extend a clip more than once?
Yes, while the clip stays inside the length limit shown on the tool page. For longer pieces, continue from the last frame on another model and join the shots in Merge Videos, or build a full story in Film Studio.
Is there a free AI video extender?
Grok Video Extend runs on credits. What is unlimited is the clip you start from: any paid plan makes MiniMax H3 Turbo clips with no credits spent. Without a plan you can try 3 free effects a day.
Video Effects New
Your first video is free. One photo, one click.
310 ready-made effects, from AI Hug and Earth Zoom In to product spins and listing walkthroughs. Upload a photo and press Generate. No prompt to write, and a free account gets 3 a day.
Make your first Grok Video Extend clip
Write a prompt above or start from any example on this page. One plan covers every top model, six studios and Sensei, and your credits roll over.
Start with Grok Video Extend