Online AI Video Generator 2026 Guide
Online AI video generators turn a single sentence or reference image into a finished clip. This guide covers the workflow, how Veo 3.1, Kling 3.0 and Seedance 2.0 differ, and how credits work on Flixly.
TL;DR
An online AI video generator turns text or images into clips using models like Veo 3.1, Kling 3.0, and Seedance 2.0. You pick the model, aspect ratio, duration, and resolution (options vary by model, up to 4K on these three), and the app quotes the credit cost before you generate. This guide covers the workflow, model differences, and the Flixly tools for captions, voice-over, and longer videos.
Modern online AI video generators let anyone produce polished clips from a single sentence or reference image. You write a prompt or upload a still, pick a model such as Veo 3.1, Kling 3.0, or Seedance 2.0, and hit generate. The platform returns a rendered clip you can use for social posts, ads, or client drafts.
How an Online AI Video Generator Works
Step-by-step workflow
- Open the Text to Video page and write a clear prompt: subject, action, setting, camera, and mood.
- Choose aspect ratio, duration, and resolution. The options depend on the model: Veo 3.1 offers 4, 6 or 8 seconds, while Kling 3.0 and Seedance 2.0 go up to 15 seconds.
- Pick a model: Veo 3.1 Fast for quicker drafts, or Kling 3.0 when you want to iterate on a character-driven shot.
- To start from a still, switch to Image to Video.
- Check the credit quote, click Generate, and download the MP4 when it is ready.
Credit costs in 2026
Credit cost varies by model, duration, resolution, and settings. Flixly sells one-time credit packs, and the generate screen quotes the exact cost of your clip before you confirm, so you can compare Veo 3.1 Fast, Kling 3.0 and Seedance 2.0 on the same prompt.
Best Models for Online AI Video Generator Tasks
Veo 3.1 family
Veo 3.1 from Google supports text-to-video, image-to-video, and reference-to-video at 720p, 1080p or 4K. Veo 3.1 Fast is tuned for speed, and Veo 3.1 Lite is a lighter option that renders 8-second clips; compare the in-app quotes to see which fits your budget. For longer, multi-shot stories, use the Long Video Generator instead of stitching single clips by hand.
Kling 3.0
Kling 3.0 handles text-to-video and image-to-video from 3 to 15 seconds at up to 4K, in 16:9, 9:16 or 1:1. To keep a subject consistent across shots, start each shot from the same image in Image to Video, or use a model that supports Reference to Video.
Seedance 2.0
Seedance 2.0 from ByteDance covers text-to-video, image-to-video, reference-to-video, and first-to-last-frame generation, from 480p up to 4K. That makes it a strong fit for brand videos that reuse the same product or spokesperson look, and for controlled transitions with First to Last Frame.
When to Use InVideo vs Flixly
InVideo centres on templates and stock-based editing, which suits quick edits built from existing assets. Flixly centres on generation, with many video models (see the models directory) plus tools for captions, voice, and music. If your project starts from a prompt or image, a generation-first tool is usually the better fit.
Practical Use Cases
Social media reels
Generate a short vertical (9:16) teaser, then run it through Auto Captions to get a captioned video for Reels or TikTok.
Product launch videos
Turn a hero product still into an animated clip with Motion Poster, and add a voice-over from Text to Speech in your editor.
Training explainers
Prompt a whiteboard-style animation in the Video Generator, then create narration with Gemini 3.1 Flash TTS or ElevenLabs Multilingual V2.
Comparison Table
| Model | Durations | Resolutions | Modes | Credit cost |
|---|---|---|---|---|
| Veo 3.1 | 4s, 6s, 8s | 720p, 1080p, 4K | Text, image, reference | Quoted in-app |
| Veo 3.1 Fast | 4s, 6s, 8s | 720p, 1080p, 4K | Text, image | Quoted in-app |
| Kling 3.0 | 3s to 15s | 720p, 1080p, 4K | Text, image | Quoted in-app |
| Seedance 2.0 | 4s to 15s | 480p to 4K | Text, image, reference, first-to-last frame | Quoted in-app |
Next Steps
New accounts start with a small credit grant. Run a short test clip in Flixly Text to Video and compare quotes across models. When you need more, buy a one-time credit pack.
Frequently Asked Questions
What is an online AI video generator?▾
An online AI video generator is a browser-based tool that converts text prompts or reference images into short video clips using machine learning models. Users choose length, style, and resolution without installing software.
How long does it take to generate a video with AI?▾
It depends on the model, the duration and resolution you choose, and current demand. Faster variants such as Veo 3.1 Fast are designed for quicker drafts, while higher resolutions and longer clips generally take longer.
Can I use an online AI video generator for free?▾
Flixly gives new accounts a small starter credit grant so you can try a few generations. After that you buy one-time credit packs; there is no recurring plan, and every generation shows its credit cost before you run it.
Which model gives the best motion quality right now?▾
It depends on the shot. Veo 3.1 is a strong choice for polished cinematic motion, Kling 3.0 for expressive character shots, and Seedance 2.0 when you need reference or first-to-last-frame control. Running the same prompt on two models is the most reliable way to decide.
Do AI video generators support voice-over and captions?▾
On Flixly they are separate steps: generate the clip, create narration with Text to Speech, and run the video through Auto Captions, which returns a captioned version of the video.
Is output from online AI video generators copyright-free?▾
Usage rights depend on each platform's license and the model provider's terms. Before using Flixly output commercially, review Flixly's Terms of Service.
