htmlcsstoimage alternatives

What htmlcsstoimage does

htmlcsstoimage is an API that accepts an HTML string or URL and returns a rendered image using headless Chrome. It supports custom fonts, CSS animations, and dynamic content. The API is used for generating social preview cards, PDF invoices, email thumbnails, and OG images from HTML templates.

It charges per screenshot and stores rendered images on its own CDN — you receive a URL to the hosted image rather than raw image bytes. For teams with privacy requirements or high volume, this model becomes expensive and problematic.

Where htmlcsstoimage falls short

• Per-screenshot pricing — starts at $14/month for 3,000 images. At 50,000 screenshots/month the cost reaches hundreds of dollars.
• No self-hosting — closed-source SaaS with no option to run on your own infrastructure.
• Your HTML leaves your servers — every request sends your rendered HTML to htmlcsstoimage infrastructure, which is a problem for private documents, customer data, or internal pages.
• Vendor lock-in — images are hosted on their CDN; if the service changes pricing or shuts down, your pipeline breaks.

The self-hosted alternative

Openkova accepts the same inputs as htmlcsstoimage — raw HTML strings, uploaded files, and URLs — and returns image bytes directly rather than a CDN URL. Deploy it on your own server and nothing leaves your infrastructure.

# Same request you'd send to htmlcsstoimage, on your own server
curl -X POST https://your-openkova-instance/api/convert/snippet \
  -H "Content-Type: application/json" \
  -d '{
    "html": "<div style=\"font-family:sans-serif;padding:40px;background:#fff\"><h1>Invoice #1042</h1></div>",
    "format": "png",
    "viewport": {"width": 1200, "height": 630}
  }' \
  --output invoice.png

Comparison

Cost comparison

Deploy Openkova in minutes

# docker-compose.yml
services:
  openkova:
    image: ghcr.io/scnix-git/openkova:latest
    ports:
      - "3000:3000"
    environment:
      - CHROMIUM_PATH=/usr/bin/chromium
      - OPENKOVA_STORAGE_PATH=/data
    volumes:
      - ./data:/data

docker compose up -d

For cloud deployment, see the guides for Railway, Fly.io, and Render.

Frequently asked questions

Is there a free alternative to htmlcsstoimage?

Yes — Openkova is MIT-licensed and free to self-host. A $20/month VPS handles thousands of HTML-to-image conversions per day with no per-screenshot fee.

Can I self-host htmlcsstoimage?

No — it is a closed-source SaaS with no self-hosting option. Openkova is the self-hostable alternative with the same HTML snippet and URL inputs.

Does Openkova accept the same inputs as htmlcsstoimage?

Yes. Openkova accepts raw HTML strings, .html file uploads, and URLs. It returns PNG, JPEG, WebP, or PDF directly as response bytes — no CDN URL required.

How much cheaper is self-hosting?

htmlcsstoimage starts at $14/month for 3,000 images. A self-hosted Openkova instance on a $20/month VPS handles 3,000–20,000 screenshots per day — cheaper at any volume above a few hundred screenshots per month.

Read the full deployment guide: How to Build a Self-Hosted Screenshot API with Docker — or see the screenshot API overview for full documentation.