PDF vs Screenshot API: Which One Do You Need?

You need to capture something programmatically. But should you generate a PDF or take a screenshot?

Both convert HTML to a downloadable file. Both use headless browsers under the hood. But they solve different problems.

Here's how to choose.

The Core Difference

When to Use a PDF API

1. Invoices and Receipts

PDFs are the standard for financial documents. They're:

• Printable at any size without quality loss
• Searchable (find that transaction from 6 months ago)
• Archivable for compliance

const invoice = await fetch("https://api.docapi.co/v1/pdf", {
  method: "POST",
  headers: { "x-api-key": "your-key" },
  body: JSON.stringify({
    html: invoiceTemplate,
    options: { format: "A4" },
  }),
});

2. Reports and Documentation

Multi-page content belongs in PDFs. A 20-page analytics report as a screenshot would be absurd.

3. Contracts and Legal Documents

Legal documents need to be:

• Paginated properly
• Text-selectable for copying clauses
• Consistent across all devices

4. Anything That Gets Printed

If the end user might print it, use PDF. Screenshots pixelate when printed at larger sizes.

When to Use a Screenshot API

1. Social Media Previews (Open Graph Images)

When someone shares your link on Twitter or LinkedIn, you need an image — not a PDF.

const ogImage = await fetch("https://api.docapi.co/v1/screenshot", {
  method: "POST",
  headers: { "x-api-key": "your-key" },
  body: JSON.stringify({
    html: ogTemplate,
    options: {
      width: 1200,
      height: 630,
      format: "png",
    },
  }),
});

2. Website Thumbnails

Link preview tools, bookmarking apps, and dashboards show website thumbnails. These are always images.

3. Email Content

Most email clients don't render PDFs inline. But images? They display perfectly.

4. App Store / Marketing Assets

Screenshots of your product for landing pages, pitch decks, or the App Store.

5. Automated Testing Evidence

QA teams capture screenshots to document bugs or verify UI states.

6. Charts and Graphs as Images

Sometimes you need to embed a chart in a doc or email. Exporting as PNG is cleaner than embedding a PDF.

The Hybrid Use Case: PDF with Screenshot Elements

Sometimes you need both.

Example: A weekly report PDF that includes a screenshot of a live dashboard.

1. Screenshot the dashboard
2. Embed the image in your HTML template
3. Generate the PDF

// Step 1: Capture dashboard
const dashboardImage = await fetch("https://api.docapi.co/v1/screenshot", {
  method: "POST",
  headers: { "x-api-key": "your-key" },
  body: JSON.stringify({
    url: "https://app.example.com/dashboard",
    options: { width: 1200, height: 800 },
  }),
});
 
const imageBase64 = Buffer.from(await dashboardImage.arrayBuffer()).toString(
  "base64"
);
 
// Step 2: Generate PDF with embedded image
const report = await fetch("https://api.docapi.co/v1/pdf", {
  method: "POST",
  headers: { "x-api-key": "your-key" },
  body: JSON.stringify({
    html: `
      <h1>Weekly Report</h1>
      <p>Dashboard snapshot as of ${new Date().toLocaleDateString()}</p>
      <img src="data:image/png;base64,${imageBase64}" />
    `,
    options: { format: "A4" },
  }),
});

Quick Decision Framework

Ask yourself these questions:

Will it be printed?

→ PDF

Is it multi-page?

→ PDF

Does it need searchable text?

→ PDF

Is it for social sharing?

→ Screenshot

Will it be embedded in another app/email?

→ Screenshot

Is it a visual snapshot of a specific moment?

→ Screenshot

Technical Differences

File Size

PDFs compress text efficiently. Screenshots compress simple graphics better.

Rendering Time

Screenshots are usually faster — they just capture what's visible.

PDFs take slightly longer because they need to:

• Calculate page breaks
• Render headers/footers per page
• Generate the PDF structure

For most use cases, the difference is negligible (both under 2 seconds).

Resolution

Common Mistakes

Mistake 1: Using PDFs for Email Thumbnails

Emails can't display PDFs inline. Use screenshots.

Mistake 2: Using Screenshots for Multi-Page Documents

A 10-page report as a single tall image? Nobody wants to scroll that.

Mistake 3: Capturing Full-Page Screenshots for Everything

fullPage: true creates massive images for long pages. Usually you want a fixed viewport.

Mistake 4: Forgetting Mobile Dimensions

If your content will be viewed on mobile, set appropriate viewport sizes:

// For mobile screenshot
options: {
  width: 390,   // iPhone 14 width
  height: 844
}

Pricing Consideration

Most API providers charge per conversion. PDFs and screenshots typically cost the same per call.

But if you're generating thousands:

• Screenshots of simple pages are faster → potentially lower costs on time-based billing
• PDFs with many pages count as one conversion → better value for long documents

Conclusion

Use PDF when:

• Document will be printed, archived, or signed
• Content spans multiple pages
• Text needs to be searchable/selectable

Use Screenshot when:

• Output is for visual display (social, email, thumbnails)
• You need a specific viewport capture
• You're embedding in another image-based context

Most apps eventually need both. That's why we offer both endpoints under one API key.

Try It

Generate your first PDF:

curl -X POST https://api.docapi.co/v1/pdf \
  -H "x-api-key: your-key" \
  -H "Content-Type: application/json" \
  -d '{"html": "<h1>Hello PDF</h1>"}' \
  --output test.pdf

Capture your first screenshot:

curl -X POST https://api.docapi.co/v1/screenshot \
  -H "x-api-key: your-key" \
  -H "Content-Type: application/json" \
  -d '{"url": "https://example.com", "options": {"width": 1280, "height": 800}}' \
  --output test.png

Both take seconds to set up. Pick the right tool for your use case.