[ Video generator ]Configure here, generate in the app

Prompt to Video

Describe your idea, get a complete video in minutes.

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Preview after generation

Describe what the video should be about in ordinary language and ShortFast writes the script, picks the visuals, records a voiceover, burns in captions, and assembles the result. You do not need to write anything beyond the prompt itself.

This is the fastest path from an idea to something publishable. It is also the mode where prompt quality matters most, because everything downstream is generated from that one instruction.

[ 01 ]How it works

Using the Prompt to Video

  1. 01

    Describe the video

    State the topic, who it's for, and what the viewer should take away. "Why small cafés lose money on delivery apps, for independent owners" beats "a video about restaurants".

  2. 02

    Pick a voice

    Choose the narrator. Match the delivery to the audience and the subject, since the same script can land or fall flat depending on pace and tone.

  3. 03

    Choose a visual style

    Stock footage, AI-generated images, or a mix. Abstract topics tend to need AI visuals because stock libraries have nothing for them.

  4. 04

    Review the generated script

    The script is written before the video is rendered, so this is where to correct a claim or sharpen the opening rather than after the fact.

  5. 05

    Generate and schedule

    ShortFast produces the video and drops it into your posting queue for TikTok, Reels and YouTube Shorts.

A vague prompt produces a generic video

The single biggest determinant of output quality is how specific the prompt is. "Marketing tips" gives you the average of everything ever said about marketing, which is exactly the kind of content that gets scrolled past because the viewer has seen it a hundred times.

Three things make a prompt concrete: a narrow topic, a named audience, and a single takeaway. "How freelance designers should price a rebrand, for people who currently charge hourly" contains all three, and the resulting script has somewhere to go.

It also helps to state the angle rather than only the subject. A video that argues something specific outperforms one that surveys a topic neutrally, because a position gives the viewer a reason to react.

Generate several, keep the one that works

Because the cost of producing a variation is close to zero, the sensible strategy is different from traditional video. Rather than perfecting one video, generate several takes on the same idea with different openings and let the platform tell you which one has legs.

This is the part that's hard to do by hand and easy to do here. Testing three hooks on the same topic used to mean three shoots; now it means running the same prompt three times and posting all three.

Once something works, the winning angle becomes the prompt pattern for the next batch rather than a one-off.

Where prompt-to-video is the wrong tool

If you already wrote the narration, use script-to-video. Prompt-to-video will write its own script and ignore your wording, which is not what you want when the words are the point.

If your source is an existing long video, YouTube-to-Shorts finds the segments worth cutting rather than generating new material around a topic.

And if the video needs facts only you have, internal numbers, a client result, a specific process, write the script yourself. Generated narration is good at structure and delivery, not at knowing things about your business.

[ 02 ]FAQ

Common questions

What makes a good prompt?
A narrow topic, a named audience, and one takeaway. "Why small cafés lose money on delivery apps, for independent owners" produces a usable script; "a video about restaurants" produces a generic one, because there is nothing in it to be specific about.
Can I edit the script before the video is made?
Yes. The script is written first and shown before rendering, which is the right moment to fix a claim, tighten the opening, or change the angle. Editing before generation is much cheaper than regenerating afterwards.
Will two people using the same prompt get the same video?
No. Generation varies between runs, so the same prompt produces different scripts, different openings, and different visual choices each time. That's what makes generating several variations of one idea worthwhile.
How long does it take?
Generation typically completes in a few minutes. The slow part is usually deciding what the video should say, which is why a specific prompt saves more time than any speed improvement in rendering.
Can it make videos about my own product?
It can, but describe the product concretely in the prompt, what it does, who it's for, what it replaces. The model doesn't know your product, so anything you leave out gets filled in generically or not at all.
Is this free?
Configuring a video here is free. Generating and publishing runs in the ShortFast app, which starts with a 3-day trial for $1. The hook generators and username checkers on this site are free and need no account.
[ 03 ]Keep going

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