HTML/CSS to Image Alternative

Renderfy vs HTML/CSS to Image

HTML/CSS to Image (hcti.io) converts HTML to PNG, JPEG, WebP, or PDF — and does it well. Renderfy covers the same formats, then adds six more input types beyond raw HTML, built-in Tailwind, a binary response instead of a hosted URL, and a lower entry price.

When HTML/CSS to Image is the right choice

If you only render HTML and CSS to an image or PDF, have been using hcti.io and are happy with it, and don't need the extra input types or an inline binary response — there's no reason to switch. It's a focused tool that does its job reliably, and its 50-images-per-month free tier is generous.

When Renderfy makes more sense

• → You want the render returned as binary in the same response, not as a hosted URL you fetch separately.
• → You want Tailwind CSS support out of the box without linking a CDN manually.
• → You need more than HTML input — Markdown, syntax-highlighted code, charts from JSON, or Mermaid diagrams.
• → You want saved server-side templates — store a layout once, render it by name with just the data that changes.
• → You need batch rendering (up to 20 per call) or idempotent retries (Idempotency-Key header, encrypted replay).
• → EU data residency matters — Renderfy's server runs in Germany and the database is in the EU.
• → You want a lower entry price: $9/mo for 2,500 credits vs $14/mo for 1,000 images.

Side-by-side: converting HTML to an image

const res = await fetch(
  'https://hcti.io/v1/image',
  {
    method: 'POST',
    auth: { user: USER_ID,
            pass: API_KEY },
    body: JSON.stringify({
      html: '<div>Hello</div>',
      css: 'div { color: white; }',
    }),
  }
);
const { url } = await res.json();
// Returns a URL, not binary

const res = await fetch(
  'https://renderfy.io/api/v1/render',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer KEY',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({
      type: 'tailwind',
      content: '<div class="p-10 bg-zinc-900 text-white">Hello</div>',
      options: { format: 'png',
                 dimensions: 'og-image' },
    }),
  }
);
const png = await res.arrayBuffer();
// Returns binary directly