Free Image Processing API Comparison 2026

// Cloudinary URL-based resize (requires account setup)
const imageUrl = `https://res.cloudinary.com/YOUR_CLOUD/image/upload/w_400,h_300,c_fill/sample.jpg`;

// Or using the SDK:
import { v2 as cloudinary } from 'cloudinary';
cloudinary.config({ cloud_name: 'YOUR_CLOUD', api_key: 'KEY', api_secret: 'SECRET' });

const result = cloudinary.image('sample.jpg', {
  width: 400, height: 300, crop: 'fill'
});

// TinyPNG API — compress + resize
const response = await fetch('https://api.tinify.com/shrink', {
  method: 'POST',
  headers: {
    'Authorization': `Basic ${btoa('api:YOUR_API_KEY')}`,
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    source: { url: 'https://example.com/photo.jpg' },
    resize: { method: 'cover', width: 400, height: 300 }
  })
});

// Frostbyte Image Processor — no signup required
const response = await fetch('https://agent-gateway-kappa.vercel.app/v1/agent-imageproc/api/resize', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    image: 'https://picsum.photos/800/600',
    width: 400,
    height: 300
  })
});

const data = await response.json();
console.log(`Resized: ${data.width}x${data.height}, ${data.size} bytes`);
// data.image contains base64-encoded result

// Resize + grayscale + blur in one call
const response = await fetch('https://agent-gateway-kappa.vercel.app/v1/agent-imageproc/api/transform', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({
    image: 'https://picsum.photos/800/600',
    steps: [
      { op: 'resize', width: 400, height: 300 },
      { op: 'grayscale' },
      { op: 'blur', sigma: 2 }
    ],
    outputFormat: 'webp',
    outputQuality: 80
  })
});

const data = await response.json();
console.log(`${data.stepsApplied} operations applied, output: ${data.format}`);