API de Suppression d’Arrière-plan RemBG – Documentation Développeur & Guide d’Intégration

Installation de rembg.js


npm i @remove-background-ai/rembg.js

API Reference for rembg.js

@remove-background-ai/rembg.js is a zero-config Node.js wrapper for the free Rembg API, enabling background removal with simple, customizable parameters.

Parameters for RemBG.js

Parameter	Type	Required	Default	Description
apiKey	string	Required	–	Your Rembg API key
inputImage	string \| Buffer \| { base64: string }	Required	–	Image file, buffer, or base64 payload
onDownloadProgress	(event) => void	Optional	–	Hook for upload progress events
onUploadProgress	(event) => void	Optional	–	Hook for download progress events
options.format	webp (default) \| png	Optional	webp	Specifies the output image format. Either "webp" (default) or "png"
options.returnBase64	boolean	Optional	false	Return Base64 string instead of file
options.returnMask	boolean	Optional	false	Return only the alpha mask
options.w	number	Optional	–	Target width (maintains aspect ratio)
options.h	number	Optional	–	Target height (maintains aspect ratio)
options.exact_resize	boolean	Optional	false	Force exact width × height (may distort)
options.angle	number	Optional	0	Rotation angle in degrees
options.expand	boolean	Optional	true	Add padding so rotated images aren’t cropped
options.bg_color	string	Optional	-	Optional solid background color in hex (e.g. #FFFFFFFF) or named color (e.g. "red", "blue")

Configuration de votre environnement : Assurez-vous d'avoir un fichier .env dans la racine de votre projet contenant votre clé API.
Importation des modules nécessaires : Commencez par importer la fonction rembg de @remove-background-ai/rembg.js et le module dotenv pour gérer les variables d'environnement.
Configuration des callbacks de progression : La bibliothèque offre des callbacks onDownloadProgress et onUploadProgress pour suivre la progression des opérations de fichier. Dans l'exemple fourni, nous enregistrons ces événements directement dans la console.

Maintenant, regardons de plus près un exemple d'utilisation :


// script.mjs file

import  { rembg } from '@remove-background-ai/rembg.js';
import dotenv from 'dotenv';
// Load environment variables from .env file
dotenv.config();

// API_KEY will be loaded from the .env file
const API_KEY = process.env.API_KEY;

// log upload and download progress
const onDownloadProgress = console.log;
const onUploadProgress = console.log;
rembg({
    apiKey: API_KEY,
    inputImage: './input.png', //inputImage can be one of these: string | Buffer | { base64: string };
    onDownloadProgress,
    onUploadProgress
}).then(({ outputImagePath, cleanup }) => {
    console.log('✅🎉 background removed and saved under path=', outputImagePath);
    // if called, it will cleanup (remove from disk) your removed background image
    // cleanup();
});

N'oubliez pas, la fonction de nettoyage peut être appelée si vous souhaitez supprimer l'image traitée de votre disque après la suppression de l'arrière-plan.

Affichage de la barre de progression

Lors de l'intégration d'un service de suppression d'arrière-plan, il est souvent bénéfique de fournir aux utilisateurs un retour sur la progression de leur demande de téléchargement ou de téléversement. Pour faciliter cela, vous pouvez définir vos propres callbacks onDownloadProgress et onUploadProgress. Ces deux callbacks acceptent AxiosProgressEvent comme paramètre d'événement. Au fur et à mesure de la progression de la demande, ces callbacks sont invoqués plusieurs fois, vous permettant, par exemple, d'afficher une barre de progression et d'ajuster sa longueur en fonction de la progression.


 (base) root@DESKTOP-C0Q8KK7:~/rembg.js-test# node index.mjs
 {
   loaded: 65687,
   total: 68474,
   progress: 0.9592984198381868, <---- @95% progress 
   bytes: 65687,
   rate: undefined,
   estimated: undefined,
   upload: true  <---- upload progress
 }
 {
   loaded: 68474,
   total: 68474,
   progress: 1, <---- @100% progress 
   bytes: 2787,
   rate: undefined,
   estimated: undefined,
   upload: true <---- upload progress 
 }
 {
   loaded: 1002,
   total: 68824,
   progress: 0.014558874811112402, <---- @1% progress 
   bytes: 1002,
   rate: undefined,
   estimated: undefined,
   download: true <---- download progress 
 }
 {
   loaded: 68824,
   total: 68824,
   progress: 1, <---- @100% progress 
   bytes: 67822,
   rate: undefined,
   estimated: undefined,
   download: true <---- download progress
 }
 ✅🎉 background removed and saved under path=/tmp/rembg--3339-DBqqeJ2eOs4D-.png

Curl


# Full example: upload an image and remove its background with all optional parameters
curl -X POST "https://api.rembg.com/rmbg"
  -H "x-api-key: YOUR_API_KEY_HERE"          # your personal API key
  -F "image=@/path/to/image.jpg"             # input image file
  -F "format=webp"                           # output format: webp (default) or png
  -F "w=800"                                 # target width in pixels (maintains aspect ratio unless exact_resize=true)
  -F "h=600"                                 # target height in pixels
  -F "exact_resize=false"                    # true = force exact w × h, may distort
  -F "mask=false"                            # true = return only the alpha mask instead of full image
  -F "bg_color=#ffffffff"                    # optional solid background color (RGBA hex)
  -F "angle=0"                               # rotate the image by given degrees after processing
  -F "expand=true"                           # add padding so rotated images don’t get cropped

HTTP


POST /rmbg HTTP/1.1
Host: api.rembg.com
x-api-key: YOUR_API_KEY_HERE
Content-Type: multipart/form-data; boundary=----BOUNDARY

------BOUNDARY
Content-Disposition: form-data; name="image"; filename="image.jpg"
Content-Type: image/jpeg
<binary data of your image goes here>
------BOUNDARY
Content-Disposition: form-data; name="format"
webp
------BOUNDARY
Content-Disposition: form-data; name="w"
800
------BOUNDARY
Content-Disposition: form-data; name="h"
600
------BOUNDARY
Content-Disposition: form-data; name="exact_resize"
false
------BOUNDARY
Content-Disposition: form-data; name="mask"
false
------BOUNDARY
Content-Disposition: form-data; name="bg_color"
#ffffffff
------BOUNDARY
Content-Disposition: form-data; name="angle"
0
------BOUNDARY
Content-Disposition: form-data; name="expand"
true
------BOUNDARY--

Python Requests


import requests

# Endpoint URL for the background-removal API
url = "https://api.rembg.com/rmbg"

# Required API key header
headers = {
    "x-api-key": "YOUR_API_KEY_HERE"
}

# The image file to process (opened in binary mode)
files = {
    "image": open("/path/to/image.jpg", "rb")
}

# Optional form fields supported by your backend.
# Adjust values as needed; any of these can be omitted.
data = {
    "format": "webp",         # Output format: "webp" (default) or "png"
    "w": 800,                 # Target width (maintains aspect ratio unless exact_resize is true)
    "h": 600,                 # Target height
    "exact_resize": "false",  # "true" forces exact w×h, may distort
    "mask": "false",          # "true" returns only the alpha mask
    "bg_color": "#ffffffff",  # Optional solid background color (RGBA hex)
    "angle": 0,               # Rotation angle in degrees
    "expand": "true",         # Add padding so rotated images aren’t cropped
}

# Send the POST request with headers, file, and extra form data
response = requests.post(url, headers=headers, files=files, data=data)

# Handle the response
if response.status_code == 200:
    # Save the processed image to disk
    with open("output.webp", "wb") as f:
        f.write(response.content)
    print("Background removed successfully → saved as output.webp")
else:
    # Print error details if the request failed
    print("Error:", response.status_code, response.text)

Utilisation & crédits

Consultez votre abonnement, votre solde de crédits et l'utilisation (app + API) pour un mois donné. Authentifiez-vous avec votre clé API.

Endpoint

GET https://www.rembg.com/api/membership-usage

Authentification

Envoyez votre clé API dans l'en-tête x-api-key : x-api-key: VOTRE_CLE_API

Paramètres de requête (optionnels)

Paramètre	Type	Description
year	number	Année (ex. 2026). Par défaut : année courante si omis.
month	number (1–12)	Mois (1–12). Par défaut : mois courant si omis.

Exemple cURL

curl --location 'https://www.rembg.com/api/membership-usage?year=2026&month=1' \
  --header 'x-api-key: YOUR_API_KEY_HERE'

Réponse

{
  "membership": "Premium-20000",
  "credits": 18500,
  "prepaidCredits": 2000,
  "app_usage": 8500,
  "api_usage": 10000
}

Error Responses

All error responses return a JSON body with a status field matching the HTTP status code.

Single Error Response

HTTP/1.1 400 Bad Request

HTTP/1.1 400 Bad Request
Content-Type: application/json

{
  "error": "Image width (12000px) exceeds the maximum allowed width of 10000px.",
  "field": "image",
  "status": 400
}

Multiple Validation Errors Response