Use Case

Generate Certificates at Scale with an API

Design your certificate in HTML/CSS. Send names and data via API. Get back pixel-perfect certificate images — thousands per minute.

Start Free — 100 certs/mo View API Docs

Who Uses This

Certificates for every use case

🎓

Online Courses

Auto-generate completion certificates when students finish a course. Integrate with your LMS — Teachable, Thinkific, or custom platforms.

🏆

Events & Conferences

Bulk-generate attendance certificates for hundreds of participants. Upload a CSV, loop through names, and get images back in seconds.

💼

Employee Recognition

Award certificates for training completion, performance milestones, or internal programs. Integrate with HR tools via API.

How It Works

HTML in, certificate image out

generate-certificate.js

// Generate a course completion certificate
const html = `
  <div style="width:1400px;height:1000px;background:white;display:flex;
    flex-direction:column;align-items:center;justify-content:center;
    border:12px solid #1e293b;padding:60px;font-family:Georgia,serif">
    <div style="font-size:18px;letter-spacing:6px;color:#64748b">
      CERTIFICATE OF COMPLETION
    </div>
    <div style="width:120px;height:2px;background:#22d3ee;margin:24px 0"></div>
    <div style="font-size:48px;color:#0f172a;margin:20px 0">
      ${recipientName}
    </div>
    <div style="font-size:18px;color:#475569;max-width:600px;text-align:center">
      has successfully completed the course
      <strong>${courseName}</strong>
      on ${completionDate}
    </div>
  </div>
`;

const res = await fetch('https://renderpix.dev/v1/render', {
  method: 'POST',
  headers: { 'X-API-Key': 'rpx_your_key', 'Content-Type': 'application/json' },
  body: JSON.stringify({ html, width: 1400, height: 1000, format: 'png' })
});

const certImage = await res.arrayBuffer();

Why RenderPix

Built for bulk certificate generation

✓

Full CSS support

Custom fonts, borders, gradients, images, logos — real Chromium rendering means your certificates look exactly as designed.

✓

Bulk-friendly pricing

Generate 50,000 certificates/month for $79. That's $0.0016 per certificate — cheaper than any alternative.

✓

PNG, JPEG, or WebP

Choose the format that fits. PNG for print-quality certs, JPEG for email attachments, WebP for web display.

✓

Retina / 2x output

Set scale=2 for high-DPI certificate images that look crisp when printed on paper.

Generate Certificates at Scale with an API

Certificates for every use case

HTML in, certificate image out

Built for bulk certificate generation

Your first certificate in 2 minutes