General Operation Guide (Core Extension Steps)

Video to be extended

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Prompt

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Video Extend

Welcome to Video Extend! This tool supports generating videos of unlimited duration. Whether it's a video created via Image to Video or Text to Video, you can infinitely extend its length with the Video Extend feature. The entire video generation process is fast, making it easy for beginners to master.

Key Features

Video Extend is a powerful tool that allows you to extend the duration of your videos infinitely. It is easy to use and fast to generate.

Unlimited Video Length Extension

Currently compatible with the following AI models: Veo 3.1, Veo 3, Wan2.5, Wan2.6, and Runway. First, generate a base video using any of these models, then click the [Extend] button for seamless content continuation.

Fast Video Generation

AI automatically analyzes the style and parameters. No complex settings are needed during extension, ensuring efficient video production.

Zero-Threshold Creation

No filming or basic editing skills are required. Both Text to Video and Image to Video outputs can be directly extended.

Consistent Characters

During extension, it automatically inherits the style, character image, and light/shadow tone of the previous video, with no frame discontinuity.

Natural Transitions

Smooth transitions between video segments, with no sense of fragmentation.

General Operation Guide (Core Extension Steps)

Applicable to All Extension Scenarios

Step1	Generate the Initial Video Method 1: Text to Video Enter the Text to Video function page, select a supported extendable model, input the initial prompt (clearly specify the scene, subject/characters, and style), and click [Generate] to get the initial video. Method 2 : Image to Video Enter the Image to Video function page, select a supported extendable model, upload a reference image, add supplementary prompts (describe the image style and dynamic details to be presented), and click [Generate] to get the initial video.
Step2	Trigger Extension After the initial video is generated, find the [Extend] button below the video and click it to automatically jump to the dedicated Video Extend page.
Step3	Confirm Video to Extend After jumping, the "Video to be extended" area will automatically load the newly generated initial video. No manual selection is needed; proceed directly to the next step.
Step4	First Extension In the prompt input box on the page, clearly describe the content to extend (e.g., "The character walks to the door, pushes it open, and enters the room"), and it is recommended to maintain the same style and detailed description as the initial prompt. No need to set parameters such as duration or resolution—the system will automatically match the parameters of the previous video. Click the [Generate] button and wait 3–4 minutes to complete the extension.
Step5	Multiple Extensions After each extension, click the [Extend] button below the successfully extended video. The "Video to be extended" area will update automatically. You can directly input the next prompt and click [Generate] to achieve unlimited extension.

Example Module

Create an 88-Second Cyberpunk Mechanic Adventure Short Film

Below is a step-by-step guide to creating an 88-second cyberpunk short film (an adventure story of the protagonist "Kael"), helping you quickly master the full process. This example uses Text to Video for the opening clip, then completes the rest via extension to get the full 88-second video, with 11 precise prompts (ready for direct copy).

Example Core Material: 11 Ready-to-Copy Prompts

These prompts are optimized for extension logic, covering the complete plot of "Protagonist Appearance → Accept Mission → Overcome Obstacles → Repair Core → Safe Evacuation" with a consistent protagonist image, ready for direct use:

1.Cyberpunk slum alley at night, neon blue-purple lights reflect on oil-stained ground, Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) leans on a broken drone, checks tools in his bag, high-fidelity light tracing, soft rain drizzle, low-contrast dark background, smooth subtle body movements

2.Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) picks up a glowing ancient data chip, glowing cyan cyber eye with red scan line flashes blue to scan it, holographic prompt pops up: "Ancient AI core in the abandoned tower", lens slow zooms on his serious face, background neon signs flicker, sharp hologram details, smooth eye movement, no frame lag

3.Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) stands up, holds tool bag in left hand, turns around and glowing cyan cyber eye with red scan line quickly scans the behind environment, walks toward the distant glowing abandoned tower, matte black mechanical arm with exposed neon blue circuits swings slightly, alley cats scurry by, dynamic motion interpolation, neon edge sharpening, stable walking track, consistent dark tone

4.Iron gate creaks open, Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) throws the tool bag away, runs into the tower lobby, broken machines scattered around, blue-purple emergency lights flicker, lens follows his running figure, echoes in the empty space, soft shadow layering, subtle dust floating, seamless frame connection

5.A faulty security robot suddenly activates, red warning lights flash, attacks Kael, Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) dodges sideways, matte black mechanical arm with exposed neon blue circuits blocks the robot's claw, tense atmosphere, dynamic contrast boost, smooth dodge motion, sharp metal collision details

6.Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) uses his matte black mechanical arm with exposed neon blue circuits to stab the robot's core, blue-purple current surges, robot shuts down with a spark, Kael pants slightly, checks matte black mechanical arm with exposed neon blue circuits for damage, realistic current effect, soft breathing motion, fine texture rendering

7.Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) continues upward, climbs the rusty metal staircase, glowing cyan cyber eye with red scan line illuminates the dark path, background shows the city's neon skyline through broken windows, smooth climbing motion, soft ambient light, clear distant city details

8.Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) reaches the tower's top floor, a huge glowing ancient AI core floats in the center, surrounded by broken circuits, blue-purple light overflows, Kael walks slowly toward the huge glowing ancient AI core, eyes fixed on the core, dreamy glow diffusion, slow forward step, high-detail core texture

9.The AI core's light flickers abnormally, red error signs appear, Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) quickly pulls out a repair module, inserts it into the core, matte black mechanical arm with exposed neon blue circuits twists to fix the circuit, dynamic error light effect, smooth repair motion, high-contrast red-blue mix

10.The tower shakes slightly, hidden exits open, Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) smiles slightly first, then turns around, walks toward the exit, AI core sends a blue light to his glowing cyan cyber eye with red scan line (a gift of data), subtle tower shake, smooth walking motion, soft light interaction effect

11.Kael (silver mohawk, glowing cyan cyber eye with red scan line, matte black mechanical arm with exposed neon blue circuits, tattered black leather jacket with neon stitching, grease-stained gray t-shirt underneath) walks out of the tower, the sun rises slightly (dawn in cyberpunk city), neon lights fade, his matte black mechanical arm with exposed neon blue circuits glows with the AI's blue light, he looks at the city, warm dawn light mix, smooth perspective transition, clear city outline

Copy Prompt

Example Operation Steps (Core Process Demo)

Step1	Generate Opening Video Enter the Text to Video page, select any supported extendable model, paste Prompt 1, and click [Generate] to wait for completion.
Step2	Enter Extension Page After generation, click [Extend] below the video—the system jumps to the Video Extend page and automatically loads the video into the "Video to be extended" area.
Step3	First Extension Paste Prompt 2 into the input box on the Video Extend page, click [Generate], and the system will automatically create seamless extended content.
Step4	Complete Full Video Extension After the first extension, click [Extend] directly—the "Video to be extended" area updates to the newly extended video. Repeat Step 3, paste Prompts 3–11 in order, and click [Generate] each time to get the full 88-second cyberpunk short film.

Key Features

Video Extend is a powerful tool that allows you to extend the duration of your videos infinitely. It is easy to use and fast to generate.

Keep Prompts Coherent

The extension prompt must logically connect with the previous content. For example, if the initial prompt is "A girl sits in a café reading a book", the extension prompt can be "The girl closes the book and waves to the waiter" to avoid plot discontinuity.

Unified Detailed Descriptions

For characters or fixed subjects, all prompts must accurately describe core details (e.g., the character's hairstyle, clothing, and accessories; the object's color and shape) to ensure the subject image remains consistent after extension.

Reuse Style Keywords

Replicate clear style keywords from the initial prompt (e.g., "cyberpunk", "Japanese fresh style", "retro film") in subsequent extension prompts to maintain a consistent style throughout.

Frequently Asked Questions

What if the extended video style doesn't match the previous content?

The key is to include consistent style keywords and detailed descriptions in the extension prompt. For example, if the initial prompt has "retro film style, warm yellow tone", add these details to the extension prompt. If a style deviation has already occurred, explicitly state "maintain the same retro film style and warm yellow tone as the previous video" in the extension prompt and regenerate.

What if the extended content doesn't match the expected plot?

Improve prompt accuracy and avoid vague descriptions. For example, instead of writing "character moves" for a slow walk, specify "character walks forward slowly with steady steps". If issues persist, add constraints such as "do not include XX action" or "focus on XX details" in the prompt to narrow the AI's creation scope.

Why does the extended Image to Video content deviate greatly from the reference image?

Explicitly link the core elements of the reference image in the extension prompt. For example, if the reference image is "a white cat lying on the sofa", the extension prompt should be "the white cat jumps off the sofa and walks to its food bowl", plus "keep the cat's fur color and size consistent with the reference image" to strengthen the AI's memory of reference elements.

Can I extend the same video in different directions multiple times?

Yes. After generating the initial video, first complete and download one extension direction. Then click [Change] next to "Video to be extended", select the initial video via Select Video, and input prompts for a new direction to generate extended content with different plots.

How to save extended videos?

After each extension, a [Download] button appears on the page—click it to save the complete extended video locally. All generated and extended videos are automatically synced to your account's "My Creations" for viewing and downloading anytime.

What's the ideal length for extension prompts?

Keep it within 800 characters. It doesn't need to be long but must include core information (subject + action + scene). Overly short prompts may cause AI deviation; overly long prompts may dilute plot focus. Concise and precise descriptions yield better results.

Viddo AI is an advanced all-in-one AI video and image generation platform that lets you quickly and easily create stunning videos and images from various inputs.