Wan Alpha

Wan Alpha — Text-to-Video Model with Alpha Channel

What is Wan Alpha?

Wan Alpha is a text-to-video model that generates clips with a real alpha channel, so your subject arrives already cut out on a transparent background — no green screen, no rotoscoping. From a single prompt it returns a WebM video or animated WebP that carries true transparency, ready to drop onto any layer in an editor or browser.

Built on the Wan2.1-T2V-14B foundation by the WeChat AI Computer Vision team, Wan Alpha learns the RGB and alpha channels jointly, so the matte lines up pixel-for-pixel with the color. That design is what makes it reliable for the elements traditional keying struggles with: smoke, glass, glow, and fine hair strands.

Key Features

• •True alpha output (RGBA): WebM or animated WebP with a real transparency channel, ready to composite.
• •Semi-transparent detail: renders smoke, glass, glowing effects, and fine hair edges cleanly.
• •Prompt-driven keying: name the subject, add "transparent background," a shot type, and a style tag.
• •Flexible delivery: 480p and 720p in landscape or portrait, plus 512x512 square presets.
• •Control: frame counts from 81 to 121, playback fps from 5 to 30, quality, and seed for reproducibility.

Best Use Cases

Wan Alpha fits any pipeline that needs transparent video assets. Use it for VFX and compositing, game effects and overlays, AR filters, motion graphics, broadcast lower-thirds, and web animations. Because the alpha matte is generated with the color, edges stay clean and semi-transparency is preserved — situations where chroma-key and manual rotoscoping break down. The transparent clip drops straight onto any background, so creators and developers skip masking and move faster from prompt to finished shot.

Prompt Tips and Output Quality

Always include the words "transparent background" — the model needs it to key the subject. Add a shot type (close-up, medium shot, wide shot) and a style tag such as "realistic style." Keep subjects relatively simple for the cleanest edges; busy scenes can show minor artifacts. Start at 480p and 81 frames to iterate, then move to 720p for delivery. Choose WebM for the widest editor and browser support, and raise output quality toward 95 when you need maximum edge detail.

FAQs

Do I have to write "transparent background" in the prompt? Yes. It is required for reliable keying; without it the subject may render on a solid background.

What output formats does Wan Alpha produce? WebM video or animated WebP, both carrying a real alpha channel. WebM composites directly in most editors and browsers.

Can it render semi-transparent effects like smoke or glass? Yes — semi-transparent objects, glow, and hair detail are a core strength of the model.

How long are the clips? Frame count ranges from 81 to 121 in steps of 4; at 16 fps, 81 frames is about 5 seconds and 121 about 7.5 seconds.

What resolutions are available? 832x480 and 480x832 (480p), 1280x720 and 720x1280 (720p), and two 512x512 square presets.

Does it support non-English prompts? Yes, the underlying model accepts both English and Chinese prompts.