Videos that draw themselves, from your script

What this is, and what it isn't

Classic whiteboard animation shows a hand sketching black marker drawings on a white board. People like it because a drawing that appears line by line holds attention: the eye follows the pen.

ContentRoof keeps that part and drops the manual work. Each sentence of your script gets one or more line drawings that trace themselves on, timed to the moment the narrator says the word. What it doesn't do:

• No white board. Videos use a dark background in a colour theme you choose, such as blueprint, cosmos or mystic, or your own brand colours.
• No drawing hand. The lines draw on by themselves.
• No sketchy, hand-inked texture. The drawings are clean open-source line icons and silhouettes.

If you need a literal hand on a white board, a dedicated whiteboard editor is the better fit. If what you want is a drawn explainer you can make from a sentence, read on.

How the drawings are chosen

A multilingual AI model reads every sentence, finds the things worth drawing (nouns and short phrases like "immune system" or "red blood cell") and matches their meaning against about 10,000 open-source drawings. It also checks each match against the whole sentence, so "the seat of the soul" doesn't become a car seat.

Then the drawings are laid out: one large drawing for a single idea, several orbiting a main one, steps joined by arrows, two sides for a comparison, or a timeline when the sentence names years. When nothing fits, the narration shows as big kinetic typography with the video's main subject. A wrong picture is never shown.

On top of that, 26 hand-made animated illustrations (a black hole, DNA, an atom, a galaxy, a prism, a brain, a heart, a fractal snowflake, a city skyline, a crowd and more) appear when the script is about them.

Typical whiteboard editor vs ContentRoof

What makes a good drawn explainer

• Use concrete nouns. "Your heart pumps blood through your lungs" draws better than "this is very important".
• One idea per sentence. Each sentence gets its own picture, so short sentences give a clear visual rhythm.
• Highlight the key word with stars, like *antibodies*. Highlighted words count more when drawings are picked.
• Take control when you want it. Name the drawings yourself with draw: and the arrangement with layout: (hero, orbit, flow, versus, count or timeline):

# headline: Training for the real thing | draw: virus, shield | layout: versus
A vaccine shows your body a harmless copy of a virus, so your immune system is ready when the real one arrives.

Who uses this style

• Teachers and tutors who want a diagram for every step of a lesson.
• Explainer channels on science, history and ideas.
• Businesses explaining a product or process without filming anything.

How it works

1. Type a topic or paste a scriptOne sentence is enough. The AI writes a script with one idea per scene, or uses yours as it is.
2. Let the drawings be pickedEach sentence is matched by meaning to the drawing library, and the lines trace on as the words are spoken.
3. Adjust any sceneSwap a scene's drawing, change the layout, the colour theme, the voice or the music. The preview updates as you type.
4. Download the videoSign in with Google for free and download the MP4 in vertical, 16:9 or square, without a watermark.

Questions

Updated 2026-10-28