**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.

選填，由使用者自訂的冪等鍵（最多 255 個字元）。設定後，成功（2xx）的回應會快取 7 天。以相同的鍵 + 相同的請求主體重試時，會回傳快取的回應（不另外扣除點數）；以相同的鍵但不同的請求主體重試，則回傳 409。可讓 POST 請求在網路故障時安全重試。對於 multipart/form-data 上傳，請求會依表單欄位與檔案內容比對，因此即使用戶端產生新的 multipart boundary，重試的上傳仍會重播先前的結果。

Idempotency-Key

image_url

image

相容用的來源圖片檔案欄位（已棄用：請改用 `image`）。

file

code

message

data

請求主體格式錯誤或缺少必要參數

Idempotency-Key 已被用於不同的請求主體。

已達速率限制。請等待 `Retry-After` 標頭中指定的秒數後再重試。

去背並保留主體，回傳具有真正透明背景的 PNG。

去背

輸入

輸出

相關 API