Best HTML to Image APIs in 2026: Convert HTML to PNG, JPEG, WebP

Converting HTML to images is needed for social media cards, certificates, email previews, reports, and dynamic graphics. The challenge is that HTML rendering requires a browser engine for full fidelity. This guide compares every viable approach: client-side libraries, server-side tools, and cloud APIs.

Comparison Table

Cloud APIs (Best for Production)

ScreenshotAPI

ScreenshotAPI converts any URL to an image with full Chrome rendering. For HTML-to-image workflows, host your HTML template at a URL and capture it:

javascript
// Host your HTML template, then capture it
const templateUrl = `https://yoursite.com/template?title=${encodeURIComponent('My Card')}`;

const params = new URLSearchParams({
  url: templateUrl,
  width: '1200',
  height: '630',
  type: 'png',
  waitUntil: 'networkidle'
});

const response = await fetch(
  `https://screenshotapi.to/api/v1/screenshot?${params}`,
  { headers: { 'x-api-key': 'sk_live_your_api_key' } }
);

const image = Buffer.from(await response.arrayBuffer());

Pros: Full CSS/JS rendering, web fonts, dark mode, all formats, no infrastructure. Cons: Requires hosting HTML at a URL, 2-5s response time.

Urlbox

Mature service with built-in HTML rendering endpoint. Supports passing HTML directly in the API request.

Pros: Direct HTML input (no hosting needed), retina rendering, S3 upload. Cons: No free tier, subscription pricing.

ScreenshotOne

Supports custom JavaScript and CSS injection, allowing you to modify the page before capture.

Pros: JS/CSS injection, interactive playground, proxy network. Cons: Monthly subscription, HTML must be at a URL.

Client-Side Libraries

html2canvas

The most popular client-side option. Reconstructs the visible DOM onto a canvas element.

javascript
import html2canvas from 'html2canvas';

const element = document.getElementById('card');
const canvas = await html2canvas(element, {
  scale: 2, // Retina quality
  useCORS: true,
  backgroundColor: null
});

canvas.toBlob((blob) => {
  const url = URL.createObjectURL(blob);
  // Use the image
}, 'image/png');

Pros: No server required, works in the browser, free. Cons: Cannot render external URLs, limited CSS Grid support, font rendering issues, no JS execution context.

dom-to-image

An alternative to html2canvas using SVG foreignObject:

javascript
import domtoimage from 'dom-to-image';

const node = document.getElementById('card');
const dataUrl = await domtoimage.toPng(node, { quality: 1.0 });

Pros: Better SVG support than html2canvas, lighter library. Cons: Same limitations as html2canvas, plus worse cross-browser support.

Server-Side Libraries

Satori (JSX to SVG)

Converts React/JSX components to SVG without a browser:

javascript
import satori from 'satori';
import { Resvg } from '@resvg/resvg-js';

const svg = await satori(
  <div style={{ display: 'flex', fontSize: 48, color: 'white', background: '#1a1a2e', width: '100%', height: '100%', alignItems: 'center', justifyContent: 'center' }}>
    Hello World
  </div>,
  { width: 1200, height: 630, fonts: [{ name: 'Inter', data: fontData }] }
);

const resvg = new Resvg(svg);
const png = resvg.render().asPng();

Pros: Extremely fast (<100ms), no browser needed, React component syntax. Cons: Very limited CSS (no Grid, limited Flexbox, no pseudo-elements, no animations), requires manual font loading.

Puppeteer / Playwright

Full browser rendering with page.setContent() for raw HTML:

javascript
import puppeteer from 'puppeteer';

const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.setViewport({ width: 1200, height: 630 });
await page.setContent(htmlString, { waitUntil: 'networkidle0' });
await page.screenshot({ path: 'output.png' });
await browser.close();

Pros: Full CSS/JS rendering, free software, raw HTML input. Cons: Requires Chrome binary (~300 MB), memory-intensive, Docker complexity.

Decision Matrix

CSS Feature Support

Verdict

For production HTML-to-image conversion with full rendering fidelity, ScreenshotAPI or Puppeteer are the best options. ScreenshotAPI removes infrastructure management. Puppeteer is free but requires server management.

For simple, template-based images without complex CSS, Satori is the fastest option.

For client-side only (no server), html2canvas is the only practical choice.

Next Steps

• Read the HTML to image conversion guide for implementation details
• See the OG image generators comparison for social card tools
• Check ScreenshotAPI pricing for credit packages
• Browse the API documentation for all parameters