Seedream 5.5 Transparent PNG: How to Make RGBA Assets

What is new in Seedream 5.5?

Seedream 5.5 is ByteDance Seed’s image generation and editing model, announced on November 9, 2026. ByteDance lists three upgrades over the previous version:

• Stable multi-turn editing. Unedited regions are preserved at the pixel level, so you can keep editing the same image. ByteDance demonstrates 100 successive edits on one portrait.
• Native RGBA output. The model can generate images with an alpha channel, with full or partial transparency.
• More realistic images and clearer text, including dense, small text in English and Chinese.

This page focuses on the feature most people searching for it want to use right away: transparent assets.

What “native RGBA” means

A normal image has three color channels: red, green and blue. An RGBA image adds a fourth, the alpha channel, which stores how transparent each pixel is. That is what lets a PNG sit on top of any background.

Until now, most AI image models produced a picture on a background, and you removed the background afterwards with a separate tool. That works for hard edges but struggles with soft ones. Seedream 5.5 instead generates the transparency itself. In ByteDance’s examples, a snowy owl keeps the fine gaps between its wing feathers and the outline of its claws, with no cleanup step.

Partial transparency matters too. Glass, smoke, sheer fabric and loose hair are not simply “in” or “out” of the subject; they are see-through to a degree. An alpha channel can store that.

How to make a transparent PNG with Seedream 5.5 in Dreamina

Dreamina is ByteDance’s consumer app for its image and video models. Its own Seedream 5.5 guide describes these steps:

1. Open Dreamina and click AI Image.
2. Choose the Seedream 5.5 image model, then set the aspect ratio, resolution and number of images.
3. Describe the asset and ask for a transparent background, for example: “A single ceramic coffee cup with a curl of steam, isolated on a transparent background, product-shot lighting.”
4. Generate, refine with follow-up edits if needed, then Download the PNG.

Dreamina adds one warning worth repeating: an image that looks transparent is not always transparent. Open the file in an editor and check that the background really is empty and the edges are clean before you use it in a layout.

What you can do with transparent assets

• Product mockups and ads: generate the product once and drop it into many backgrounds.
• Stickers and decorative elements for social posts and packaging.
• Lettering and logos: ByteDance shows styled text generated directly as a transparent asset, keeping the words legible.
• Character sets for a series: ByteDance’s demo reuses the same character assets as references to create a consistent set of scenes with new poses and groupings.

How Seedream 5.5 compares

All of the numbers below come from ByteDance’s own evaluations, so treat them as the maker’s claims until independent tests appear.

If you need transparent assets specifically, the more practical comparison is with your current workflow: generating on a plain background and removing it afterwards. Native RGBA should save the most time on soft and see-through edges.

What we don’t know yet

• Official API pricing and limits for Seedream 5.5.
• Exactly which Dreamina plans include it, and how many credits a transparent image costs.
• When the Pro version arrives, and how it will differ.

We will update this page as ByteDance publishes more.