How to Create Videos With AI: Step-by-Step Guide

You don’t need a camera or editing skills to create a video with AI. You do, however, need an understanding of how video generators work and how to prompt them.

This guide walks through the full process in seven steps, from choosing an input type to exporting the final clip. It includes a prompt formula, tips on keeping characters consistent across shots and a section on turning separate clips into an AI movie. Every model mentioned is available on SYNTX.AI.

Every AI video starts from one of three inputs, and the one you pick decides how much control you have.

• Text-to-video: You describe the clip in words and the model invents everything. It's the fastest way to start but gives you the least control over how characters and the environment look.
• Image-to-video: You upload a still (many models accept several references, such as a character, a product and a location) and describe the motion. The image fixes the subject, setting and style, so the model only has to animate it. Your text prompt still decides what happens in the video. This works best for product shots, portraits and anything that must match an existing brand look.
• Video-to-video: You upload footage and describe a change, for example, the lighting, background or camera angle. Use it to fix or restyle something you already shot.

If the look matters, generate or choose a still first and animate it. You can create the still with an image model like Nano Banana or use a real photo of a person or location. Use text-to-video when you're still exploring ideas.

No model wins at everything, so match the model to the job. Here are the best AI video generators right now and what each one does best.

Video models respond to the vocabulary filmmakers use, so precise terms beat vague adjectives. "Low-angle tracking shot, 35mm lens, golden hour" gives a model far more to work with than "cool cinematic shot." Build every prompt from the same six elements, then fill each one with specific terms.

The six-part prompt structure

• Subject: Who or what is on screen, with specific details such as age, clothing, materials and expression
• Action: What the subject does
• Setting: Location, time of day and weather
• Camera: How much of the subject is in frame (wide shot, medium shot, close-up) and how the camera moves
• Style and lighting: The light, color palette and overall look
• Audio: Sound effects, music or spoken lines

Use professional terminology

Pull your camera, lighting and style terms from this list. These are just a few examples to give you an idea of the keywords to use.

Choose one term per category. Mixing opposites, such as low-key and high-key lighting, can confuse the model.

A few more tips on how to write AI video prompts:

• Keep one action per clip. A 5–15 second clip can't hold a plot. "She walks, stops, turns and smiles" is four clips.
• Be specific, not poetic. Materials, colors and times of day work better than mood words like "epic" or "dreamy."
• Describe speech and sound directly. Put spoken lines in quotation marks and name the delivery, such as whispered or hurried. Veo 3.1 handles dialogue best, since it generates speech and sound in the same pass as the picture.
• Use negative prompts. Add exclusions directly to the prompt, for example "no text overlays, no extra people, no motion blur." If the model has a separate negative prompt field, you can use that instead. If an unwanted element keeps appearing anyway, rephrase the exclusion as what you do want, such as "an empty street" instead of "no people."

Treat your first generation as a draft. Outputs vary between runs, even with the same prompt, so plan on several attempts before you get a keeper.

• Draft on a fast model, finish on a strong one. Grok Imagine generates clips in seconds, Veo has a faster Omni Flash version, and Luma's Draft Mode renders rough versions at a fraction of the time and cost. You can then upscale your pick in a tool like Luma to full 4K HDR, keeping the same composition and motion.
• Choose your aspect ratio before you generate. Set it in the model's settings before you start: 16:9 for YouTube and widescreen, 9:16 for TikTok, Reels and Shorts, or 1:1 for square feeds. You can't fix it afterward. Cropping a finished 16:9 clip to 9:16 discards roughly two-thirds of the frame, lowers the resolution and can cut off your subject.
• Run three to four variations before editing the prompt. If most of them share the same flaw, the prompt is the problem. If only one does, it's just a bad roll.
• Change one thing at a time. If the camera move is wrong, rewrite only the camera line. Changing the subject, setting and style together makes it impossible to tell what fixed or broke the result.
• Keep a prompt log. Save every prompt that produced a good clip. You'll reuse the structure more often than you expect.

The most common problems have simple fixes:

Consistency is the hardest part of AI video. Left alone, a character's face, outfit or even the room can change from one clip to the next. Three techniques fix most of it.

Use reference images

Several models can lock a subject to your uploads:

• Kling's element binding accepts up to four reference images, such as a character, a product and a location.
• Veo's Ingredients to Video takes up to three.
• Seedance 2.5 accepts up to 50 reference inputs, including images, clips and audio.

Start every shot from the same still

Create your character once with an image model, then use that image as the starting frame for each image-to-video clip. This holds appearance steadier than describing the character in text each time.

Repeat your description word for word

Write one fixed line for each character and paste it into every prompt, for example: a man in his 40s with short gray hair, round tortoiseshell glasses and a navy wool coat. Changing the wording between prompts invites the model to change the character.

Do the same for style

Pick one look, such as "35mm film grain, muted green palette, soft overcast light," and attach it to every prompt in the project.

Audio

The process here depends on the model you use. Kling, Veo, Runway, Seedance, Luma and Grok generate sound together with the picture. Veo gives the most accurate lip-sync. Grok Imagine accepts a voice sample and can use that voice in the clip. Hailuo 2.3 has no native audio, so you can create it separately in an AI voice generation tool like ElevenLabs.

Length

Most models cap a single generation at 8-15 seconds. You have three ways to get past that limit:

• Use a long-clip model. Seedance 2.5 generates up to 30 seconds in one pass.
• Extend the clip. Veo's Scene Extension chains eight-second segments into sequences of more than a minute, keeping the subject, outfit and camera consistent. Quality can slip on long extensions, so check each segment.
• Glue multiple shots together. Generate each shot separately and edit them in sequence. This gives you the most control and is how most AI films are built, as the next section shows.

A good generation still needs a short finishing pass.

Fix what's close but not right

Runway's Aleph lets you edit an existing footage. Describe the change, such as relighting the scene, removing an object or swapping the background, and it applies it without regenerating the whole shot.

Check resolution before you export

Kling generates up to 4K at 60 frames per second, and Veo upscales to 4K for finals. Runway's native output is 720p at 24 frames per second, so plan an upscaling pass.

Assemble the shots in an editor when needed

A single clip with native audio can go straight to publishing. You need an editor when you combine several shots, such as in a longer video or an AI movie, or when you want your own music or voiceover. In that case, import your clips into any editor, such as CapCut, DaVinci Resolve or Premiere Pro, and place them in story order. Trim shaky or unfinished frames from the start and end of each clip, apply the same color correction to every shot so the look matches, and add music, sound effects or a voiceover on separate audio tracks.

An AI movie involves the same process, repeated shot by shot, with some extra planning up front.

• Write the story. You need to know the beginning, the plot twist and the ending before you generate anything.
• Build a shot list. Write one line per shot with the location, action, camera move and length.
• Prepare reference images. One image for each main character and location.
• Generate shot by shot. Use the same references and style line for every prompt. Kling 3.0 can also take a full shot list and build the sequence in one pass.
• Cut and finish. Assemble the shots in order, add music and voiceover, and match color across clips.

An AI movie's cost comes from retries, not from the final cut. Most shots need several attempts before one is usable, so at three attempts per shot a 10-shot film means 30 generations. Estimate your total as shots × attempts × cost per generation, then add a margin for the difficult shots. Check the credit cost of each model before you assign shots to it.

The process above works best when you can run the same prompt through more than one model and compare. SYNTX.AI gives you Kling, Veo, Seedance and 100+ other models in a single dashboard, so you can draft on a fast model, finish on a strong one and switch tools without juggling subscriptions. Tokens don't expire, so what you don't use this month carries over.

How do I create a video with AI?

Choose an input type (text, image or video), pick a model that fits the job, write a prompt covering subject, action, setting, camera, style and audio, then generate drafts and refine one variable at a time. Finish by editing, upscaling and exporting. SYNTX.AI lets you run the process across several models from one account.

How long can an AI-generated video be?

A single generation runs from about 6 to 30 seconds, depending on the model. Seedance 2.5 offers 30 seconds, Kling and Grok Imagine 15, and Veo 8. Longer videos come from extending clips or cutting several shots together.

Can I create AI videos for free?

Yes. Kling and Hailuo have free plans, and Luma offers free credits through Dream Machine. Free tiers come with lower limits, slower queues and sometimes watermarks. SYNTX.AI also gives new users welcome tokens on registration, so you can test several models before you commit.

What's the best way to make a video from a photo?

Use image-to-video. Upload the photo, then describe only the motion and the camera move, since the image already defines how everything looks. Kling, Runway and Seedance all handle this well.

Do I need editing skills to make an AI movie?

No, but basic editing helps. The models generate the shots, and a simple editor is enough to trim, order and add music. Kling 3.0 can plan and assemble a multi-shot sequence from a shot list on its own.