Developer guide

🟢 ICO to PNG with Node.js

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

Node.jsREST APIICO → PNG

Use this guide to convert ICO to PNG with Node.js, 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 ICO file, trigger a ICO to PNG job, and return the output to your app or workflow.

Node.js 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

ICO to PNG

import { readFileSync } from 'node:fs';
import { Buffer } from 'node:buffer';

const auth = 'Basic ' + Buffer
  .from(process.env.CONVERTERER_API_KEY + ':')
  .toString('base64');

const form = new FormData();
form.append(
  'input',
  new Blob([readFileSync('input.ico')]),
  'input.ico'
);
form.append('output_format', 'png');

const res = await fetch('https://api.converterer.com/convert', {
  method: 'POST',
  headers: { Authorization: auth },
  body: form,
});

const task = await res.json();
console.log(task.id);
// Result lands at <your-destination>/<task.id>.png

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 PNG output

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