Image

Seedream 4.0 API

Seedream 4.0 API is ByteDance's unified text-to-image and image editing model. Generate 4K images with industry-leading text rendering, batch processing, and multi-reference support.

4K GenerationText RenderingBatch ProcessingReference ImagesImage Editing

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Service Highlights

Official Discounts
Pay-as-you-go
Fast & Low Latency

Input

Model

Prompt

143 characters

Size

Resolution

Number of Images

Sequential Generation

Prompt Optimization Mode

Content Moderation

Watermark

Reference Image

Output

Image link valid for 72 hours

Seedream 4.0 API Pricing

Transparent pricing with no hidden fees. Pay only for what you use.

Variant	Tier	GoldCurrent price	Platinum	Diamond	Official	Your savings
`seedream-4-0`	1K/2K/4K	0.195Credits(~$0.0195)/pic	0.1853Credits(~$0.0185)/pic	0.1755Credits(~$0.0176)/pic	0.2438Credits(~$0.0244)/pic	20%

* Actual costs are subject to final output.

Seedream 4.0 API - High-Quality 4K AI Image Generation

APIMart provides fast access to ByteDance Seedream 4.0 API. Generate high-fidelity 4K images with superior text rendering, use batch generation, and use reference images for style consistency. Batch generation requires reference images. Reference and generated images must total no more than 15.

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50K+

Active Users

99.9%

Uptime

Faster

20%

Cost Savings

Why Seedream 4.0 API

Key capabilities for developers and creators

Pay-as-you-go Pricing

Pay for image generation as you use it. See the pricing details on this page for current prices and discounts.

Official Channel Integration

Direct integration with ByteDance official API for stable service.

Superior Text Rendering

Industry-leading text accuracy in images. Perfect for posters, signs, labels, and marketing materials.

Batch Generation

Generate multiple images per request using reference images. Create variations, A/B test designs, or produce at scale. Reference and generated images must total no more than 15.

Reference Images

Upload references for style fusion. Maintain visual consistency across outputs. Reference and generated images must total no more than 15.

Layout Awareness

Smart grid layouts (2x2, triptych, comics). Preserves whitespace for titles and CTAs.

Unified Edit + Generate

One model for creation and editing. Remove objects, replace elements with simple prompts.

What You Can Build

Common use cases for Seedream 4.0 API

Marketing Visuals

Create posters, ads, and social content with accurate text. Batch generate variants for A/B testing.

Product Images

Generate product shots, packaging mockups, and hero images. Use references for brand consistency.

Educational Content

Create diagrams, charts, and illustrations. Knowledge-driven generation for accurate visuals.

Style Transfer

Transform images into watercolor, cyberpunk, or custom styles using reference images.

Multi-Panel Art

Generate comics, storyboards, and grid layouts. Maintain character consistency across panels.

Image Editing

Edit existing images with text prompts. Replace objects, change backgrounds, add elements.

Start Using Seedream 4.0 API

Generate your first image in minutes

Create Account & Add Balance

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Get API Key

Generate your API key from the dashboard for authentication.

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Make Request

POST to /v1/images/generations with your prompt. Receive task_id and poll for results.

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Developer Feedback

What users say about Seedream 4.0 API on APIMart

“Text rendering finally works. We generate event posters with accurate titles and dates - something that always failed with other models.”

Mike Chen

Marketing Developer

“Batch generation changed our workflow. We generate 15 product variations in one call, pick the best, done. Massive time saver.”

Sarah Kim

E-commerce Tech Lead

“Reference image support is a game-changer for brand consistency. Upload brand assets, get on-brand visuals every time.”

James Liu

Creative Agency CTO

“Fast generation speed transformed our content pipeline. We can now produce high-quality visuals at scale without compromising quality.”

Anna Park

Content Platform Engineer

“0.2 Credits(~$0.02) per image with this quality? We migrated from a 2000 Credits(~$200)/month subscription and now spend less while generating more.”

David Wang

Startup Founder

“The unified edit+generate model means one API for everything. Removed 3 other services from our stack.”

Lisa Zhang

Full Stack Developer

Seedream API Model Family

Compare every Seedream model on APIMart. One API key calls all of them, billed per image.

Model	Best for	Resolution
Seedream 5.0 Pro API	Quality-first cinematic images, precise text, up to 10 references and layer splitting	1K / 1.5K / 2K
Seedream 5.0 Flash API	Fast cinematic images with precise text and up to 10 references	1K / 1.5K / 2K
Seedream 5.0 Lite API	4K images with advanced text rendering and batches of up to 15	2K / 3K / 4K
Seedream 4.5 API	4K text-to-image with precise text rendering and multi-reference batches	2K / 4K
Seedream 4.0 APIThis page	4K text-to-image and image editing with batch output	1K / 2K / 4K

All Seedream API models on one page →

Seedream 4.0 API FAQ

Quick answers to common questions

What makes Seedream 4.0 different from other AI image models?

Seedream 4.0 combines generation and editing in one unified architecture. It offers 4K output, superior text rendering, and supports reference images - features not found together in competitors. Batch generation requires reference images. Reference and generated images must total no more than 15.

How fast is image generation?

Image generation is fast and efficient. 2K and 4K images are generated quickly, making it suitable for real-time applications and high-volume workflows.

How do I write effective prompts?

Use structure: Subject + Style + Details. Be specific, use natural language. For text in images, use double quotes like "Your Text Here". Avoid overloading prompts with too many instructions.

How do reference images work?

Upload reference images via URLs. Seedream 4.0 extracts style, characters, and elements to maintain consistency. Great for brand assets, character series, and style matching. Batch generation requires reference images. Reference and generated images must total no more than 15.

What does the API cost?

Seedream 4.0 API is billed per image. Batch generation is settled according to the number of images actually produced. See the pricing details on this page for current prices and discounts.

What image resolutions does Seedream 4.0 support?

Seedream 4.0 supports output resolutions up to 4K (4096x4096 max). You can specify custom width and height in your API request, with multiple aspect ratios available for different use cases like social media posts, banners, and print materials.

How much does the Seedream 4.0 API cost?

The Seedream 4.0 API is billed per generated image. The pricing table on this page lists every specification and shows the Gold member price, 20% off. Platinum and Diamond members save even more, up to 28%. You only pay for successful requests.

How do I get a Seedream 4.0 API key?

Sign up for APIMart, open the API Keys page in your dashboard and create a key. The same key calls the ByteDance Seedream 4.0 API and every other model on the platform, with pay-as-you-go billing and no subscription.

How do I use the Seedream 4.0 API?

Send a generation request with your prompt and parameters. The Seedream 4.0 API runs as an asynchronous task: it returns a task id right away, and you poll that task until the result is ready. Full parameters and code examples are in the APIMart docs (docs.apimart.ai).

Is the Seedream 4.0 API free?

No, there is no free quota for the Seedream 4.0 API. It is pay-as-you-go: you only pay for successful requests, and every price already comes with 20% off. Platinum and Diamond members save up to 28%.

Are Seedream 4, Seedream v4 and Seedream 4.0 the same model?

Yes. Seedream 4 and Seedream v4 are short names for ByteDance's Seedream 4.0 model. On APIMart you call it with the model ID seedream-4-0, and the same API key also works for newer versions in the ByteDance Seedream family, such as Seedream 4.5 and Seedream 5.0 Lite.

How can I contact support for help?

You can reach us via the live chat in the bottom-right corner, email us at [email protected], or join our Discord community. Our team will get back to you as soon as possible.

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Seedream 4.0 API FAQ

Quick answers to common questions

What makes Seedream 4.0 different from other AI image models?

How fast is image generation?

Image generation is fast and efficient. 2K and 4K images are generated quickly, making it suitable for real-time applications and high-volume workflows.

How do I write effective prompts?

Use structure: Subject + Style + Details. Be specific, use natural language. For text in images, use double quotes like "Your Text Here". Avoid overloading prompts with too many instructions.

How do reference images work?

What does the API cost?

Seedream 4.0 API is billed per image. Batch generation is settled according to the number of images actually produced. See the pricing details on this page for current prices and discounts.

What image resolutions does Seedream 4.0 support?

How much does the Seedream 4.0 API cost?

How do I get a Seedream 4.0 API key?

How do I use the Seedream 4.0 API?

Is the Seedream 4.0 API free?

Are Seedream 4, Seedream v4 and Seedream 4.0 the same model?

How can I contact support for help?

You can reach us via the live chat in the bottom-right corner, email us at [email protected], or join our Discord community. Our team will get back to you as soon as possible.