// Never ship your API key in public front-end code – proxy through your server.
const input = document.querySelector('input[type=file]');
input.addEventListener('change', async () => {
const form = new FormData();
form.append('image_file', input.files[0]);
form.append('size', 'preview');
const res = await fetch('https://bgcut.net/api/v1/remove', { method: 'POST', headers: { 'X-Api-Key': 'bgc_YOUR_API_KEY' }, body: form });
const blob = await res.blob();
document.querySelector('img#out').src = URL.createObjectURL(blob);
});
// Java 11+ HttpClient, no external libraries
import java.net.URI;
import java.net.http.*;
import java.nio.file.*;
public class BgCut {
public static void main(String[] a) throws Exception {
String key = "bgc_YOUR_API_KEY";
String boundary = "----bgcut" + System.nanoTime();
byte[] file = Files.readAllBytes(Path.of("photo.jpg"));
String head = "--" + boundary + "\r\nContent-Disposition: form-data; name=\"image_file\"; filename=\"photo.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
String tail = "\r\n--" + boundary + "\r\nContent-Disposition: form-data; name=\"size\"\r\n\r\nauto\r\n--" + boundary + "--\r\n";
byte[] body = concat(head.getBytes(), file, tail.getBytes());
HttpRequest req = HttpRequest.newBuilder(URI.create("https://bgcut.net/api/v1/remove"))
.header("X-Api-Key", key)
.header("Content-Type", "multipart/form-data; boundary=" + boundary)
.POST(HttpRequest.BodyPublishers.ofByteArray(body)).build();
HttpResponse<byte[]> res = HttpClient.newHttpClient().send(req, HttpResponse.BodyHandlers.ofByteArray());
if (res.statusCode() == 200) Files.write(Path.of("result.png"), res.body());
else System.out.println(new String(res.body()));
}
static byte[] concat(byte[]... parts) { int n = 0; for (byte[] p : parts) n += p.length; byte[] out = new byte[n]; int o = 0; for (byte[] p : parts) { System.arraycopy(p, 0, out, o, p.length); o += p.length; } return out; }
}
using System.Net.Http;
using System.Net.Http.Headers;
var client = new HttpClient();
client.DefaultRequestHeaders.Add("X-Api-Key", "bgc_YOUR_API_KEY");
using var form = new MultipartFormDataContent();
var fileContent = new ByteArrayContent(await File.ReadAllBytesAsync("photo.jpg"));
fileContent.Headers.ContentType = new MediaTypeHeaderValue("image/jpeg");
form.Add(fileContent, "image_file", "photo.jpg");
form.Add(new StringContent("auto"), "size");
form.Add(new StringContent("png"), "format");
var res = await client.PostAsync("https://bgcut.net/api/v1/remove", form);
if (res.IsSuccessStatusCode)
await File.WriteAllBytesAsync("result.png", await res.Content.ReadAsByteArrayAsync());
else
Console.WriteLine(await res.Content.ReadAsStringAsync());