guide
Negative prompts in AI video: what they are and when they help
A negative prompt tells a video model what you do not want to see. Some tools give it its own box, while others expect you to describe what you want clearly and leave the rest out. This guide explains when a negative prompt helps and how to keep one short.
Build a short negative prompt
Positive prompt: A cyclist rides through a morning market, tracking shot, soft sunlight, sharp focus. Negative prompt: blurry, watermark
What it does
A normal prompt describes the clip. A negative prompt lists things to steer away from, such as blur, distorted hands or text. Tools that support it use it to reduce those artefacts, though it is not a guarantee.
Which tools use one
Support differs between tools and changes over time. Some interfaces have a dedicated negative prompt field, and others do not. Check the options on the tool you use, and if there is no field, write what you want positively instead.
A starter list
- blurry, out of focus
- distorted hands, extra fingers, extra limbs
- text, captions, logos, watermark
- flicker, jitter, warped faces
- low resolution, compression artefacts
Keep it short
A long list of exclusions can crowd out the main idea. Start with the four or five problems you actually see in your test clips and add to the list only when a problem keeps coming back.
Say what you want, too
Describing the result positively, such as “sharp focus, steady camera”, is often as useful as excluding blur. Use the negative prompt as a backup, not as the main instruction.
Where to get a ready-made one
The prompt generator on this site adds a short negative prompt line when you choose the Kling format, so you can see how it fits with the rest of the prompt.
An example
Positive prompt: “A cyclist rides through a morning market, tracking shot, soft sunlight, sharp focus.” Negative prompt: “blurry, text, watermark, warped faces.” The positive prompt carries the idea, and the negative prompt trims common problems around it.
Testing whether it helps
- Generate a clip with no negative prompt.
- Generate the same clip with a short negative prompt.
- Compare the two for the problems you listed.
- Keep the negative prompt only if it clearly improved the result.
Because results vary from attempt to attempt, try each version more than once before you decide.
When it can backfire
Excluding too much can make a clip look flat, and excluding something the model needs, such as “people” in a street scene, can empty the shot. Keep exclusions specific and tied to problems you have seen.
Frequently asked questions
Do all AI video models support negative prompts?
No. Support varies by tool and version, so check the interface you use.
Can a negative prompt fix bad hands?
It can reduce the problem but not remove it. Hands are a known weak spot, so keep them out of frame when you can.
Where do I put a negative prompt if my tool has no field?
You can add a short “avoid” line to the end of the main prompt, but it may work less reliably than a dedicated field.
Is a negative prompt the same as a content filter?
No. A negative prompt steers the style of the result. Content filters are the platform’s own rules about what it allows.
Keep reading
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