A VAE — variational autoencoder — is the part of a video model that converts between images and the compressed representation the model actually works in. The weights arrive as safetensors files, and the VAE is usually one of them. wan2-6.net does not distribute model files. This page explains what the component does, because a mismatched VAE is one of the most common causes of bad local output and worth understanding even if you never touch it here.
The model does not generate pixels directly. It generates a compressed latent representation, and the VAE decodes that into the frames you watch. It also does the reverse when you supply a first frame. That makes it a bottleneck in both directions: an error introduced here is not a small colour shift, it is structure.
Recognisable symptoms of the wrong VAE include washed or grey output, colour that drifts frame to frame, and detail that dissolves in motion. It usually looks like a model problem, which is why people spend hours tuning prompts before suspecting the file.
VAEs are trained alongside the model they belong to, so a VAE from a different generation or a different fine-tune is not a drop-in replacement even when the tensor shapes line up. The safe habit is to take the VAE from the same release as the weights, and to change one component at a time so you can tell which one moved the result.
Two related traps:
If you are not assembling the pipeline, none of the above applies to you: on a hosted workspace the components are chosen for you and the only decision left is the prompt, the route and the output band. That is the point of hosting — the class of bug you cannot debug is designed out.
If you do go local, Wan 2.2 GGUF covers format and memory, Wan 2.2 Hugging Face covers repositories, and Wan 2.2 FP8 covers precision. For the hosted route, start at the Wan workspace.
Does this site provide safetensors files? No. It runs the model for you and serves no weight files.
My local output looks grey and washed out. Why? The VAE is a strong first suspect — check that it comes from the same release as the weights.
Can I swap in a VAE from a different model? Sometimes it runs, but the output is no longer trustworthy. Take it from the same release.
What if I do not want to manage any of this? Use the hosted route: pick a route in the Wan workspace and only choose prompt, band and duration. The credit cost is shown before you submit, and prices are on pricing.