You want a short AI video and immediately hit a fork: describe the whole clip in words, or generate a still image first and animate it. Both paths exist in every serious video tool, both produce a clip at the end, and picking the wrong one is the most common reason a first video comes out looking nothing like what you imagined.
The two modes aren't interchangeable — they trade control for speed in opposite directions. This guide lays out what each does well, where each fails, and the one-question rule for choosing. Both run in Imageny's video generator.
What's the actual difference between the two modes?
Text-to-video generates motion straight from a written prompt. You describe the subject, the scene, and the movement — a paper boat drifting down a rainy street, camera slowly following — and the model invents everything: the look of the boat, the street, and the motion, all in one pass.
Image-to-video starts from a still image you supply and generates motion from it. The image locks the first frame — composition, character, palette, style are already decided — and your prompt only describes what moves: gentle drift downstream, rain ripples, slow tracking shot.
The practical consequence: text-to-video makes the model decide what things look like and how they move; image-to-video makes it decide only how they move. That's the whole trade.
When is text-to-video the right choice?
Text-to-video wins when the motion itself is the point and the exact appearance is negotiable:
- Exploring ideas. You want to see what "a city folding into origami" even looks like. One prompt, one pass, instant answer.
- Motion-first clips. Weather, crowds, flowing water, abstract loops — scenes defined by movement rather than by a specific subject you need to match.
- Volume. Mood clips and B-roll where any good result is acceptable, so re-rolling is cheap.
Its weakness is precision. Because the model invents the look and the motion together, you can't pin down a specific face, product, or composition — every generation reinvents them. If you've ever tried to get the same character twice out of pure text, you already know this pain from still images; in video it doubles. The full prompting technique for this mode is in the text-to-video guide.
When is image-to-video the right choice?
Image-to-video wins whenever the starting frame matters more than the journey:
- A character you've already built. You spent real effort getting a design right — animating that exact image is the only way the video stars that exact character.
- Style control. The still image carries the art style with it. A watercolor scene animates as watercolor; a mecha stays that mecha.
- Composition control. You choose the framing in a medium you can iterate on cheaply (stills), then commit it to the expensive medium (video) once it's right.
Its weakness is motion range. The clip has to grow out of the supplied frame, so it suits drifting clouds, hair in wind, a slow camera push — not a character leaping off-screen into a different composition. Big motion asks the model to invent content the image never showed, and quality drops fast. Prompt patterns for animating stills are in the image-to-video guide.
Which one should a beginner start with?
Image-to-video, and it isn't close. The still-image step gives you a cheap iteration loop: you refine the look at image cost, and only pay video cost once the frame is worth animating. Text-to-video puts every variable — look, layout, motion — into a single expensive roll, which is a rough way to learn.
The one-question rule: do you already know exactly what the first frame should look like? If yes, make that frame as an image and animate it. If no — if you're fishing for the idea itself — text-to-video is the faster fishing rod.
Can I use both together?
That's the workflow most experienced users settle into, because it uses each mode for what it's good at:
- Text-to-video to explore. Rough prompts, quick passes, until one clip has the energy you want.
- Still generation to lock the look. Recreate the best concept as a polished image — exact character, exact palette, exact framing.
- Image-to-video to produce. Animate the locked frame with a short motion prompt.
Explore in words, lock in pixels, animate the lock. Each pass narrows what the model is free to reinvent, which is the same principle behind every consistency technique on this blog.
Make your first clip
Open the video generator and run the rule: know your first frame, animate an image; still hunting for the idea, write it as text. Either way, keep motion prompts short — one subject movement, one camera movement. Free credits are included when you sign up.
Cover photo by Kyle Loftus on Unsplash.