**Cost**: 5 credits per successful call.

Remove Background supports two input modes:

1. **JSON URL mode**: send `application/json` with the existing URL field.
2. **Direct upload mode**: send `multipart/form-data` with a local image file in the `image` field. The compatible field name `file` is also accepted for the primary image. Codia checks credits before reading and uploading the file, so insufficient-credit requests return `402` without uploading anything.

Direct upload example:

```bash
curl 'https://openapi.codia.ai/v2/open/remove_bg' \
  -H 'Authorization: Bearer {codia_api_key}' \
  -F 'image=@./product.png'
```

Cut out the foreground subject of an image and return a PNG with a fully transparent background. A synchronous, single-purpose endpoint — no model parameter, no prompt, no options.

## What this API is for

Product photos for storefronts, profile avatars, sticker generation, compositing pipelines — any time you need the subject without its scene. Returns a true alpha-channel PNG (not a flat white background).

## Request

| Field | Required | Notes |
|---|---|---|
| `image_url` | yes | Public URL of the image to process. PNG, JPG, or WebP. Must be reachable from Codia's network. |

## Response

Standard envelope. Unique to this endpoint (not the shared `ImageUrlListSuccess`): `data.image_url` is a **single** string — a CDN URL to the processed transparent PNG. Download promptly; the URL is pre-signed.

```json
{ "code": 0, "message": "ok", "data": { "image_url": "https://cdn.codia.ai/bg-removed/abc.png" } }
```

## Billing & limits

- 5 credits per successful call, from the unified Codia Open API balance.
- Synchronous; typically completes within a few seconds.
- Output is always PNG with an alpha channel, at the input image's resolution.

## Errors

Standard set — `400` for bad input, `401`/`403` auth, `402` credits, `429` rate limit, `500` internal.

> **Sync vs. async**
> This synchronous endpoint returns the result inline — the simplest path. For production pipelines that need webhook delivery, automatic retry with idempotency, or explicit task cancellation, call `POST /v2/open/tasks` with `operation=remove_bg` instead. Inputs and credit cost are identical to this v2 endpoint.

可选，由用户自定义的幂等键（最多 255 个字符）。设置后，成功（2xx）的响应会缓存 7 天。使用相同的键 + 相同的请求体重试，会返回缓存的响应（不额外扣除积分）；使用相同的键但不同的请求体重试，则返回 409。用于确保 POST 请求在网络故障时可以安全重试。对于 multipart/form-data 上传，请求会按表单字段和文件内容进行比较，因此即使客户端生成了新的 multipart boundary，重试的上传也会被重放。

Idempotency-Key

image_url

image

兼容用的源图片文件字段（已弃用：请改用 `image`）。

file

code

message

data

请求体格式错误或缺少必填参数

Idempotency-Key 已被用于不同的请求体。

请求频率超限。请等待 `Retry-After` 响应头中指定的秒数后再重试。

抠出主体，返回带真正透明背景的 PNG。

背景移除

输入

输出

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