851 LabsFastHigh

Background Remover

The most-used background remover on Replicate (27M+ runs). Removes backgrounds with soft alpha or hard segmentation, supports reverse mode (remove foreground), custom background types, and transparent PNG output — all at a very low price.

1 credits

per image

Most-used background remover on Replicate

Soft alpha matte or hard segmentation (threshold)

Reverse mode — remove the foreground instead

Custom backgrounds: transparent, white, green, blur, overlay

Extremely low cost (2 credits per image)

Run it right now

Test this model instantly in the Console Playground — no code required

Use with AI Assistant

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llms.txtllms.txt ↗

Quick Start

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "851-labs/background-remover",
  "input": {
    "image": "https://example.com/product.jpg",
    "format": "png",
    "background_type": "rgba"
  }
}'

Parameters

Parameter	Type	Required	Default	Description
`image`	string	Yes	-	Input image to remove the background from
`threshold`	number	No	0	Hard segmentation threshold (0.0-1.0). 0 uses soft alpha matte
`reverse`	boolean	No	false	Remove the foreground instead of the background
`background_type`	string	No	rgba	'rgba' (transparent), 'white', 'green', 'blur', 'overlay', 'map', an [R,G,B] array, or an image URL
`format`	string	No	png	Output format (png for transparency, jpg)

How to Provide File Input

There are 3 ways to provide files for the image parameter:

Recommended

Direct Upload (Multipart)

Attach files directly to POST /v1/predictions/upload. No separate upload step needed.

curl -X POST "https://api.core.today/v1/predictions/upload" \
  -H "X-API-Key: cdt_your_api_key" \
  -F "model=851-labs/background-remover" \
  -F 'input={"prompt":"your prompt here"}' \
  -F "file:image=@your_file.png"

Image URL

Pass a publicly accessible URL directly. You can also use file_url from the Storage API.

{
  "model": "851-labs/background-remover",
  "input": {
    "prompt": "your prompt here",
    "image": "https://example.com/image.jpg"
  }
}

See the File Upload docs for more upload methods including Presigned URLs.

Common Parameters

Common parameters used when calling POST /v1/predictions.

Parameter	Type	Required	Default	Description
`model`	string	Yes	-	Model identifier
`input`	object	Yes	-	Object containing the model-specific parameters from the table above
`output_folder`	string	No	-	Folder path for output files (max 256 chars, '..' not allowed)
`webhook_url`	string	No	-	Webhook URL to call on completion
`is_public`	boolean	No	false	If true, output files are also available via permanent public URLs

Examples

Transparent Product Cutout

Remove the background and get a transparent PNG

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "851-labs/background-remover",
  "input": {
    "image": "https://example.com/product.jpg",
    "format": "png",
    "background_type": "rgba"
  }
}'

White Background for Marketplace

Replace the background with clean white

curl -X POST "https://api.core.today/v1/predictions" \
  -H "Content-Type: application/json" \
  -H "X-API-Key: cdt_your_api_key" \
  -d '{
  "model": "851-labs/background-remover",
  "input": {
    "image": "https://example.com/product.jpg",
    "background_type": "white"
  }
}'