Seedream 5.5 Image Generator & Editor

Overview

Seedream 5.5 is ByteDance’s image creation model for text-to-image generation and instruction-based image editing. It’s built for iterative work where you keep most pixels unchanged while you refine specific parts across many edit rounds. It can also produce native RGBA assets, so you can export clean cutouts with real transparency for design and compositing.

What you can build

• Product hero images, background swaps, and variant generation for e-commerce
• Ad creatives and social banners with more legible in-image text
• Sticker packs, icons, and subject cutouts with transparent backgrounds
• Concept art and scene exploration with consistent composition across revisions
• Portrait edits like wardrobe, accessories, and environment changes while preserving identity
• Design mockups that need repeated “change X, keep everything else the same” iterations

Inputs

• A required written instruction describing what to generate, or what to change and what to keep. Use explicit “keep” statements for identity, pose, and unedited regions.
• An optional single input image to edit. Use a common image file like PNG, JPEG, or WEBP. If you don’t provide an image, the model generates from your instruction only.
• A required output resolution tier selection (1K, 1.5K, or 2K). Pick higher tiers for sharper details and small text.
• An optional aspect ratio choice. You can leave it on Auto, or choose a fixed ratio like 1:1, 16:9, 9:16, 4:3, 3:4, 3:2, 2:3, 5:4, 4:5, 21:9, or 9:21.
• An optional background mode. Use Transparent when you want an image with an alpha channel, Opaque for a solid background, or Auto to let the model decide from your instruction.
• An optional output file format choice (PNG or JPEG). Choose PNG when you need transparency.
• An optional watermark toggle to add an “AI generated” mark to the output.

Outputs

The model returns an image file in the format you selected.

• For PNG output, the response can include an RGBA image when you request a transparent background.
• For JPEG output, the image has no alpha channel.
• Outputs commonly include file metadata such as the download location, file name, file size, and image dimensions when available.

Limitations

• This model works best when you clearly state what must stay unchanged. Vague edit instructions can cause unintended shifts.
• Multi-turn editing depends on feeding the previous output back as the next input image. Large changes across many rounds can still accumulate artifacts.
• Transparent background output requires PNG. If you ask for transparency but choose JPEG, you won’t get an alpha channel.
• Low-quality inputs raise failure risk. Heavy compression, blur, watermarks, screenshots of UI, and noisy images can reduce edit stability.
• Complex layouts and tiny text are improved, but not perfect. Dense typography can still show misspellings or warped glyphs.

Safety & compliance

Seedream 5.5 may refuse or filter requests for disallowed content. Follow all applicable laws and respect privacy and consent.

• Don’t generate or edit real people in ways that enable impersonation, harassment, or deception.
• Don’t upload images you don’t have rights to use, especially branded assets meant to mislead.
• Use the watermark option when your use case requires clear disclosure of synthetic media.