Developer guide

☕ JPG to ICO with Java

Convert JPG images to ICO format online for compatibility, compression, quality, and workflow needs.

JavaREST APIJPG → ICO

Use this guide to convert JPG to ICO with Java, then adapt the example to your own app, backend, or processing flow.

Overview

What this guide covers

Conversion path

Use Converterer to accept or prepare a JPG file, trigger a JPG to ICO job, and return the output to your app or workflow.

Java example

Start with the example on this page, then adapt auth, file handling, polling, and result delivery to your environment.

Production usage

This is best suited to backend jobs, async processing, content pipelines, and repeatable conversion flows rather than one-off browser scripting.

Quick start

Get a working example in place

Code example

JPG to ICO

import okhttp3.*;
import java.io.File;

OkHttpClient client = new OkHttpClient();
String auth = Credentials.basic(
    System.getenv("CONVERTERER_API_KEY"),
    ""
);

RequestBody body = new MultipartBody.Builder()
    .setType(MultipartBody.FORM)
    .addFormDataPart(
        "input",
        "input.jpg",
        RequestBody.create(
            new File("input.jpg"),
            MediaType.parse("application/octet-stream")
        )
    )
    .addFormDataPart("output_format", "ico")
    .build();

Request req = new Request.Builder()
    .url("https://api.converterer.com/convert")
    .header("Authorization", auth)
    .post(body)
    .build();

try (Response res = client.newCall(req).execute()) {
    String json = res.body().string();
    // {"id":"...", "status":"queued"}
    // Result lands at <your-destination>/<id>.ico
}

Implementation notes

What to handle in your app

API endpoint

Conversion endpoint

https://api.converterer.com/convert

Use your API key for authentication and submit the source file plus the target output format in your job request.

App responsibilities

source file upload or storage handoff
job submission and status handling
success/failure handling in your backend
download or delivery of the ICO output

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