AI Short Video Generator: Vertical Videos for Shorts, TikTok and Reels From One Idea

What is an AI short video generator?

An AI short video generator writes, voices, illustrates and edits a short vertical video for you. Short means made for a phone held upright and a feed that moves on with a swipe: usually 15 seconds to 3 minutes, in 9:16, watched with the sound on or off.

A good one hands you the finished file, not a project to assemble. FacelessCast's studio takes a message such as "a 30-second AI video about the loneliest whale" and returns a Short with its script, voice, scenes, captions and cover, plus a title, description and hashtags to post it with.

What makes a short video work?

Viewers decide in the first second, so a short video is built backwards from that second. Feeds learn from what people do with a video: TikTok, for example, says its For You feed weighs interactions such as likes, shares and whether a longer video is watched to the end, alongside video information such as captions, sounds and hashtags. These are the habits that keep people watching:

• Show the hook, do not announce it: the strangest image or the boldest line comes first, never a greeting.
• One idea per video. A short that tries to say three things says none.
• A new picture every few seconds, cut to the voice.
• Captions burned in, word by word, for everyone who watches muted.
• An ending that pays off the hook, or loops back to it.
• The length the idea needs, and not a second more.

How long should a short video be?

Make it as long as the idea holds, and check each platform's limit before going long. On YouTube, a square or vertical video of up to three minutes counts as a Short. Instagram lets you record and edit Reels of up to 20 minutes, but says Reels over 3 minutes won't be recommended to new audiences. Platforms change their limits often, so check the app before posting anything long.

A practical guide by length:

How does FacelessCast build a short video?

One message, a plan, and then everything runs on its own:

• You describe the video, or paste your script. Vertical 9:16 is the default; landscape and square come from the same project.
• The plan card shows the length, the voice, the kind of scenes and the price. Nothing starts until you accept, and a free storyboard shows every scene first.
• The script is written hook-first at exactly the length you asked: 20 seconds is made as 20 seconds.
• A natural narrator, or characters who speak their own lines with their lips in sync.
• A scene under every line: a generated AI clip of about six seconds that moves, or a licensed stock clip.
• Captions in classic, word-highlight or bold style, music when you ask for it, and a cover.
• A publish kit: three title options, a description, tags and hashtags.

AI video or real footage for short videos?

AI video makes the shorts nobody could film: a talking animal, a scene from ancient Rome, a character your audience follows from episode to episode. Real stock footage makes the shorts about the real world, a fact about a city, a tip, a list, truthfully and with no credits at all.

Many channels mix the two across their week: stock-footage days for volume and AI video days for the posts that need moving scenes or characters.

One short video for Shorts, TikTok and Reels

The same 9:16 MP4 posts on YouTube Shorts, TikTok and Instagram Reels, and with no watermark on any plan it carries nothing that ties it to a tool. Change the title and hashtags for each platform from the publish kit, and keep the first second the same: it is the part that works everywhere.

Each platform has its own rules for labelling realistic AI content. On YouTube, use the AI use setting when a video looks real, such as realistic AI footage of a real place; clearly unrealistic or animated videos do not need it.

How many short videos can you make, and what do they cost?

Stock-footage short videos use no credits: they are unlimited on every plan within a daily fair-use limit. AI video shorts are paid in credits, about 140 for 30 seconds at standard quality and half that at draft quality, so the plan decides how many you can make each month:

Posting a 30-second AI video every day takes about 4,200 credits a month, which means Studio plus credit packs, or alternating stock-footage days with AI days. Credit packs start at $5 for 100 credits and never expire.

Series, batches and a posting rhythm

Short-form channels grow on a rhythm, and a rhythm is easier when the videos make themselves. A series keeps a bible of recurring characters, a world and an episode formula, so each episode continues the story and the faces stay the same; autopilot makes a new episode daily or weekly. Batch generation makes several videos from a list of topics at once, and topic ideas suggest what to make next.

A rhythm is not a flood. YouTube's monetization policies exclude mass-produced, generic or repetitive content, so publish as often as you can keep each video its own idea.

Can you earn from AI short videos?

Yes, if the channel is monetizing and the shorts are original. On YouTube, Shorts feed ad revenue goes into a Creator Pool shared by engaged views, and monetizing creators keep 45% of what is allocated to them; views of non-original Shorts, such as reuploads or compilations with nothing added, are not counted. Our guide on how to monetize YouTube Shorts covers the thresholds step by step.

What FacelessCast does not do for short videos

It does not cut your long videos or other people's videos into clips: every short is made new, from your idea or your script. It does not post to the platforms for you, clone your voice or offer a free plan; your first video, cut from real stock footage and up to 2 minutes, is free with a small watermark, and plans start at $10 a month. AI clips last about six seconds each, so action is told in shots, and a talking scene needs a character who faces the camera.

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