A zombie AI video without a watermark is what you get once you spend a credit on a clip. Before that, the site shows you a free preview with a watermark on it. The difference between the two is not the effect, the length, or the model. It is the watermark and the download, and this guide explains exactly what each version gives you.
What the free preview shows
The preview is the full clip. You upload your photo, the site runs it through the image-to-video model, and you get back a short cinematic video that shows you what the finished result looks like. You can watch it, check whether your photo produced the shot you hoped for, and decide whether it is worth keeping.
The one limitation is the watermark. The free version carries a mark on the video, so it is meant for checking your result rather than posting it. Everything else about the clip is exactly what you will get once you pay. The effect, the five-second length, the movement and the mood are all decided before the watermark question comes up.
That is the whole point of the preview. It lets you see whether a photo works before you spend anything, which matters because the source image decides most of the result. A photo with a cropped face or a busy background will not magically improve once you pay, so seeing the clip first saves you from buying a version you do not want.
What a paid credit unlocks
Spending credits does two things. It removes the watermark, and it unlocks the download, so you get a clean file you can post, send or keep.
The clip itself does not change between the preview and the paid version, because the preview was already the real result. There is no higher-quality render waiting behind the payment, and no extra effect that only unlocks after you buy. What you are paying for is the clean copy and the ability to take it off the site with you.
That is a simple deal, and it is worth being clear about it: no credit means a watermarked preview you can watch, and a credit means the same clip without the mark and with the download available. Nothing in between.
What one clip costs in credits
One clip is 300 credits, and one clip is a five-second video. Credits come in packs, and the pack price sets the per-clip price.
The smallest pack is $4.99 for 300 credits, which covers exactly one clip. If you only want to make one zombie clip, that is the whole cost, and there is nothing else to buy.
The middle pack is $9.99 for 1,500 credits, which works out to five clips. The largest pack is $19.99 for 3,300 credits, which works out to eleven clips. So the more you buy at once, the lower the price per clip, but the entry price for a single clip stays at $4.99.
Those same $4.99, $9.99 and $19.99 figures are also the monthly tiers, so if you expect to keep making clips you can pick a monthly plan instead of a one-off pack. There are yearly options above those. Every combination is written out on the pricing page, so you can compare the one-off packs and the plans without guessing.
Why the preview exists at all
It would be simpler to charge first and render after, but that order puts the risk on you. The source photo decides most of the outcome, and no amount of careful writing about how to shoot a photo removes the fact that some pictures simply produce a better clip than others.
The preview moves that risk onto the site. You see the clip that your exact photo produced, watermark and all, before you spend anything. If the result is not what you wanted, you change the photo and try again, and you only ever pay for a clip you have already watched and decided to keep.
That matters more for some effects than others. The zombie video generator takes two photos, so there is more to get right and more reason to preview before buying. The zombie pet effect takes one photo of an animal, and the preview is how you find out whether the shot you picked reads as your pet or as a blur. The AI mini me effect has the same one-photo setup, and the same logic applies: watch it watermarked first, then decide.
A useful habit is to treat the preview as a check on the photo, not on the effect. The effect behaves the same way every time it runs, so a weak result almost always points back at the source image rather than the model. A cropped subject, a cluttered background or harsh side light will produce a duller clip no matter how many credits you are holding. Fixing the photo is free, and the preview is how you find out which part to fix. That is why the free version is worth using even if you already know you intend to pay: it turns a guess into a comparison.
The preview also answers a question no description can: whether the effect suits the photo you have. Reading that a photo should be well lit is useful, but watching your own clip and seeing that the light was fine is better. The free version exists so that judgement happens before money changes hands.
How this compares to paying elsewhere
If you have looked at other tools that turn a photo into a short video, you have probably seen one-off prices between $6.90 and $12.99 for a single video. That is the range for comparable generators, and it is why the $4.99 entry here is worth pointing out. It is a straightforward comparison of the price of one clip, not a claim about anything else.
The credit system is also flexible in a way a flat per-video price is not. One clip costs 300 credits whether you bought the $4.99 pack or the $19.99 pack, so once you decide to buy more than one, the price per clip drops without changing what a clip is. You are not choosing between different clip lengths or quality levels, just between how many you want.
Where to try it before you decide
The cleanest way to test any of this is to make a clip on this site and watch the free preview. Upload a photo, let the model run, and look at the watermarked result. That version costs nothing and tells you whether the clip is what you wanted.
Only after you have seen it do you need to think about credits. If the preview is good, one clip is $4.99, and the watermark comes off and the download unlocks. If it is not, you change the photo and try again, still without paying. The generator is already on the page under the article, so there is no separate step before you can see your own clip in the zombie video generator.
The point of the free preview is that you should never have to pay to find out whether a photo works. Watch your clip first, then decide, and the watermark question only comes up once you already know the answer.