Does ShortFast rewrite my script?

No. Script-to-video reads your narration as written. If you want the wording changed or generated for you, use prompt-to-video instead, which writes the script from a topic before producing the video.

How long can the script be?

Short-form runs roughly 150 words per minute of narration, so a 60-second video is about 150 words and a 30-second one about 75. Longer scripts still work, they just produce longer videos, which suits YouTube Shorts better than TikTok.

Can I use my own voice instead of an AI voice?

You choose from the generated voices in the configurator. If you already have a recording you want to keep, you're editing rather than generating, and a conventional editor is the better tool for that job.

Do the captions match the voiceover exactly?

Yes. Captions are generated from the same narration the voice reads, so they stay in sync rather than being transcribed afterwards and drifting.

Can I turn one blog post into several videos?

That is usually the right approach. Split the post into its individual claims and run each one as its own script. One video per idea consistently outperforms a single video trying to summarise an entire article.

Configuring a video on this page is free. Generating and publishing it runs in the ShortFast app, which starts with a 3-day trial for $1. The hook generator and username checkers on this site run entirely in your browser with no account at all.

[ Video generator ]Configure here, generate in the app

Script to Video

Paste your script, get a polished video with visuals and voiceover.

Narration script

0/400

Voice

B-roll style

Preview

Preview after generation

Paste a finished script and ShortFast handles everything that normally sits between writing and publishing: choosing visuals for each line, recording a voiceover, burning in captions, and cutting the whole thing to the pacing short-form demands.

This is the mode to use when the words already exist. If you have a blog post, a newsletter section, a podcast segment, or a script you wrote yourself, you're not looking for an idea generator, you're looking for a production line.

[ 01 ]How it works

Using the Script to Video

01
Paste your script
Drop in the narration exactly as you want it read. Write for the ear rather than the page: short sentences, one idea per line, no subheadings or bullet formatting.
02
Pick a voice
Choose the voice that reads your narration. Match it to the audience rather than to your own taste, an explainer for founders and a story for teenagers do not want the same delivery.
03
Choose a visual style
Stock footage for credibility, AI images for scenes no stock library has, or mixed to get both. Mixed is the safe default for most scripts.
04
Set the format
Vertical 9:16 for TikTok, Reels and Shorts. This is also where the caption style is applied, burned in rather than uploaded as a separate track.
05
Generate and publish
ShortFast assembles the video and hands it to your posting queue, so the same script can go out to several platforms without re-exporting anything.

Writing for video is not the same as writing for reading

The most common reason a script-to-video output feels flat is that the script was written to be read, not heard. Prose that works on a page is usually too dense when spoken: subordinate clauses lose people, and a paragraph that scans fine visually becomes an unbroken wall of narration.

The fix is mechanical. Cut every sentence that has two ideas in it into two sentences. Read the script out loud once and delete whatever you stumble on. Put the conclusion first rather than building to it, because in short-form the viewer decides whether to stay before you reach your third sentence.

If you're repurposing a blog post, don't paste the introduction. Blog intros exist to reassure a reader who already clicked; a video opening has to earn a viewer who hasn't decided yet. Start at the point where the post gets specific.

What repurposing actually gets you

A blog post that ranks is a piece of content that already survived a filter: someone searched, read it, and stayed. That's a reasonable signal that the topic has an audience, which makes it a better bet for video than something invented from scratch.

The mistake is treating one post as one video. A 1,500-word article usually contains four or five separate claims, each of which is a video. Pulling them apart gives you a month of content from one source instead of a single overstuffed 60-second summary that covers everything and lands nothing.

The same is true in reverse. Videos that perform tell you which arguments your audience responds to, which is useful input for what to write next.

When to use a different mode

If you don't have a script yet and don't want to write one, prompt-to-video starts from a topic and writes the narration for you. Script-to-video assumes the writing is done and does not rewrite what you paste.

If your source is an existing long video rather than text, the YouTube-to-Shorts tool finds the segments worth cutting instead of generating new footage around narration.

And if you only want the hook rather than a whole production, the free hook generator runs in your browser with no account.

[ 02 ]FAQ

Common questions

Does ShortFast rewrite my script?: No. Script-to-video reads your narration as written. If you want the wording changed or generated for you, use prompt-to-video instead, which writes the script from a topic before producing the video.
How long can the script be?: Short-form runs roughly 150 words per minute of narration, so a 60-second video is about 150 words and a 30-second one about 75. Longer scripts still work, they just produce longer videos, which suits YouTube Shorts better than TikTok.
Can I use my own voice instead of an AI voice?: You choose from the generated voices in the configurator. If you already have a recording you want to keep, you're editing rather than generating, and a conventional editor is the better tool for that job.
Do the captions match the voiceover exactly?: Yes. Captions are generated from the same narration the voice reads, so they stay in sync rather than being transcribed afterwards and drifting.
Can I turn one blog post into several videos?: That is usually the right approach. Split the post into its individual claims and run each one as its own script. One video per idea consistently outperforms a single video trying to summarise an entire article.
Is this free?: Configuring a video on this page is free. Generating and publishing it runs in the ShortFast app, which starts with a 3-day trial for $1. The hook generator and username checkers on this site run entirely in your browser with no account at all.