How do I run the "Base64 PDF" demo?

Install and launch Web Print Expert, then click Run print or Preview PDF on this page. The "Base64 PDF" demo runs the sample code with web-print-pdf over the local WebSocket service.

Do I need a local Vue or React project for this demo?

No. This page bundles web-print-pdf and editable sample code—you can run it directly in the browser.

Is the data in the "Base64 PDF" demo real?

No. All layouts, amounts, and names are fictional demo data for API illustration only.

Live demos

.demo-compat-banner--noscript { display: block !important; }

20 - Base64 PDF

printPdfByBase64 prints server-encoded PDF payloads without a download URL.

Base64 PDF: printPdfByBase64 prints server-encoded PDF payloads without a download URL. Run in the browser with Web Print Expert (fictional demo data).

Sample code

// 业务中通常由服务端直接返回 PDF Base64；此处从演示地址拉取并编码
const res = await fetch('https://webprintpdf.com/api/fileCenter/webPrintExpert/fileCenterFileDownload/printTest.pdf');
const bytes = new Uint8Array(await res.arrayBuffer());
let binary = '';
for (let i = 0; i < bytes.length; i++) binary += String.fromCharCode(bytes[i]);
const pdfBase64 = btoa(binary);

await webPrintPdf.printPdfByBase64(
  pdfBase64,
  { paperFormat: 'A4' },
  { paperFormat: 'A4', copies: 1 }
);

Back to all demos

Browse the sample list on the left and preview layouts plus sample code on the right. Run a demo to print silently or preview PDF via web-print-pdf and the local client. Install and launch the client first.

Client

If results look wrong, install the latest Web Print Expert client from our site first (older builds may cause layout drift).

Layout

Preview and print follow standard HTML/CSS only—no hidden tricks. What you style is what you get.

20 - Base64 PDF

printPdfByBase64 prints server-encoded PDF payloads without a download URL.

Sample code

// 业务中通常由服务端直接返回 PDF Base64；此处从演示地址拉取并编码
const res = await fetch('https://webprintpdf.com/api/fileCenter/webPrintExpert/fileCenterFileDownload/printTest.pdf');
const bytes = new Uint8Array(await res.arrayBuffer());
let binary = '';
for (let i = 0; i < bytes.length; i++) binary += String.fromCharCode(bytes[i]);
const pdfBase64 = btoa(binary);

await webPrintPdf.printPdfByBase64(
  pdfBase64,
  { paperFormat: 'A4' },
  { paperFormat: 'A4', copies: 1 }
);

Result

Demos load bundled web-print-pdf first (same API as npm); CDN is used as fallback.
The client’s built-in Run examples page has more editable demos; this page complements it.
Utility demos (connection, printer list) return JSON only—no print job.

Download client free View npm package

20 - Base64 PDF

Layout preview

Sample code

Result