Car Background Removal (Base64)#

Base URL: https://api.withoutbg.com · Spec: openapi.json

Remove background from a car photo; return Base64 RGBA PNG in JSON.

Cost: 1 credit on HTTP 200.

Uses the dedicated car pipeline. Window reconstruction is on by default (reconstruct_windows=true): opens glass interiors while keeping the car outline. Set reconstruct_windows=false to skip. Set include_shadow=true to bake a soft cast shadow into the cutout. For uncomposited cutout + shadow layers, use /v1.0/car-cutout-and-shadow-base64. No image-type sidecar (car photos are photographic). Binary sibling: /v1.0/car-image-without-background.

Endpoint#

POST /v1.0/car-image-without-background-base64

Base URL: https://api.withoutbg.com

Authentication#

Provide your API key in the request header:

API key header

X-API-Key: <your_api_key>

Request#

Content-Type: application/json

Fields#

image_base64 (string, required) — Input image as a raw Base64 string (no `data:` URI prefix). Supported formats: JPEG, PNG, WebP, AVIF, HEIC, TIFF, BMP, GIF. Maximum decoded size: 20.0 MB. Invalid Base64, non-image data, unsupported formats, or oversize payloads fail with HTTP 422.
include_shadow (boolean, optional) — When true, generate a soft cast shadow under the car and bake it into the RGBA cutout (black shadow behind the object).
reconstruct_windows (boolean, optional) — When true (default), run car window reconstruction: opens glass interiors while keeping the car outline. Cutout RGB stays the original photo (unless include_shadow=true). Set false to skip and use the base silhouette alpha only.

Response#

Success Content-Type: application/json

Body fields#

input_dimensions (array<integer>, required) — Decoded input size as `[width, height]` (pixels).
processed_dimensions (array<integer>, required) — Size after server prep downscale (longest-side / megapixel caps) as `[width, height]`. Distinct from model inference resolution (~1024 long side).
was_downscaled (boolean, required) — True when the input was downscaled during server prep.
view (object, required)
camera (object, required)
img_without_background_base64 (string, required) — Car cutout as Base64 PNG (RGBA) with transparent background. If `include_shadow` was true on the request, the soft cast shadow is already baked into this image. Prepend `data:image/png;base64,` to display in a browser.

Errors#

Status	Description	Detail
`401`	Invalid API Key	Invalid API Key
`402`	Insufficient credit. Please top up API credits.	Insufficient credit. Please top up API credits.
`403`	Credits Expired. Please top up API credits. If you have existing credits, they will be reactivated.	Credits Expired. Please top up API credits. If you have existing credits, they will be reactivated.
`422`	Validation error. Includes invalid Base64, non-image payloads, unsupported formats, and decoded size over 20.0 MB.	[object Object]
`429`	Rate limit exceeded (product policy: 30 requests/minute per API key). May be returned by the API gateway. Retry with exponential backoff.	{"error":"Too Many Requests","status":429,"message":"Rate limit exceeded. Please try again later"}
`500`	Internal Server Error	Internal Server Error. Please contact support: contact@withoutbg.com

Example (cURL)#

cURL

curl -X POST \
  -H "X-API-Key: $WITHOUTBG_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"image_base64":"<raw_base64>"}' \
  "https://api.withoutbg.com/v1.0/car-image-without-background-base64"

Car Background Removal (Binary) — POST /v1.0/car-image-without-background
Car Cutout + Shadow (Base64) — POST /v1.0/car-cutout-and-shadow-base64

Contract sections are generated at build time from OpenAPI. Markdown mirror: /docs/pro-model/car-background-removal-base64.md