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Image to video

See the eight compared

The workflow that holds a character still. One generated image goes in, motion comes out, and the subject stays the subject — which prompt-only generation cannot promise across two clips.

What the model is doing

Input
One still
Control
Motion prompt
Holds for
~4–8 s
Best for
Recurring character

An image-to-video model receives a frame and a short motion instruction, then predicts the frames that follow. Nothing about the subject is re-decided: the model is constrained by what is already in the picture, so its only freedom is movement, camera and the way light changes with it.

That constraint is the entire value of the category. It is also the reason output length is short — the further the model travels from the supplied frame, the less the frame constrains it, and the drift that prompt-only generation shows immediately shows up here at around the eight-second mark.

Which input is in scope

This catalogue covers one input: an image of an invented character, generated by you or licensed to you. That is not a stylistic preference. Producing sexual material from the likeness of a real, identifiable person without their consent is an offence under the UK Online Safety regime, under a majority of US state statutes, and under South Korea's special act on sexual crimes — and in each case the person uploading is the person liable.

The workflow that wastes the fewest credits

  1. Generate stills until the character is right. Stills are an order of magnitude cheaper than clips.
  2. Save the frame you approve, at the largest size the generator offers.
  3. Drive every clip from that frame, varying only the motion prompt. Two clips from one frame will match; two clips from one text prompt will not.
  4. Keep the source frames. When a vendor changes models — which happens without notice in this category — the frames are the only part of your work that survives.

Where it fails

Hands and overlapping limbs are still the limit of the technique, and no vendor in this category has solved them. Rapid motion fails before slow motion. Anything that leaves the original frame — a cut, a new angle, a second character entering — is outside what the constraint can support, and is usually where a long generation turns into something unusable.

Before you pay

  1. Policy on real people

    A generator that accepts a photograph of an identifiable person is a legal problem for whoever uploads it, and in the UK, US state law and South Korea the upload itself is the offence.

    Walk away if: The tool advertises likeness transfer, face swapping or anything described as undressing a photograph.

  2. Who owns the output

    Terms differ sharply on whether you may publish what you generate, and on whether the vendor may reuse it in training or promotion.

    Walk away if: The terms grant the vendor an unlimited licence to your generations and say nothing about your own rights.

  3. What happens to prompts and uploads

    Prompts in this category are sensitive by definition, and a vendor that keeps them indefinitely turns a breach into a personal disaster.

    Walk away if: No retention period anywhere, no deletion route, support answers by asking for a screenshot of your billing page.

  4. Export and watermarks

    A watermark on the free tier is normal; a watermark that stays on a paid plan is a detail vendors bury.

    Walk away if: Resolution and watermark status are absent from the pricing page and only appear after payment.

Related pages

Video generators · Image generators · How this catalogue is built

Questions about image to video

What makes image-to-video better than prompt-only generation?
The still fixes the subject. Everything the model would otherwise invent — face, body, lighting, wardrobe — is already decided, so the only thing being generated is motion. That is both cheaper and far more consistent, which is why character-led workflows in this category start from an image rather than a description.
Which images are acceptable to upload?
Images you generated or own, depicting invented characters. A photograph of an identifiable person is the one input this catalogue treats as out of scope: sexual material made from someone's likeness without consent is criminal in the UK, in most US states and in South Korea, and the upload itself is the act the statutes name. Vendors that advertise this use case are not listed.
Why does the motion look like a loop?
Short generations are often produced as a cycle so the first and last frames match, which hides the point where coherence would fail. It is a reasonable trade at four seconds and obvious at ten. If a product's samples are all gentle motion in a fixed frame, that is the reason.
Does resolution of the source image matter?
Up to the model's input size, yes; beyond it, no. Most pipelines downscale to a fixed working resolution, so a very large source buys nothing and a very small one loses detail that cannot be recovered afterwards. Vendors that publish their working resolution are the minority, which is itself worth noting.

The tool we are paid to feature

SpicyAI — Discover AI characters with unique personalities. Chat, share stories, or create a companion of your own — with text, voice, images, and video.

Free tier: Free to use, with ads and the standard model. The plan card says five chat turns; the comparison table on the same page says ten turns per character (subscribe page, read 20.10.2026).

Confirmed capabilities, from the vendor's documentation.
Still image generation yes
Companion chat yes
Voice output yes
Persistent character memory yes

Sources: Subscribe , Terms of service , Privacy policy , Community guidelines

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Category page Input policy: generated characters only Revised 2026-10-19