Generate a pdf file

Option 1: Using the browsers print feature

Use window.print() to print the current page.

To hide certain elements from the print view you can use @media print in your css.

<button onclick="window.print()">Print</button>

<p class="no-print">I'm visible on the website but hidden on the printed page.</p>
<p class="print">I'm invisible on the website but visible on the printed page.</p>

<style>
    .print {
        display: none;
    }

    @media print {
        .no-print {
            display: none;
        }
        .print {
            display: block;
        }
    }
</style>

This approach does require the user to select the PDF option in the print dialog.

Option 2: Using a PDF library

There are many PDF libraries like PDF-LIB that allow you to easily generate a pdf file. Here is a basic example of using it with a sveltekit +server.ts endpoint:

import { PDFDocument } from 'pdf-lib';

export async function GET() {
    const pdfDoc = await PDFDocument.create();

    const page = pdfDoc.addPage();

    page.drawText('Pdf content', {
        x: 50,
        y: 700,
        size: 20
    });

    const pdfBytes = await pdfDoc.save();

    return new Response(pdfBytes, {
        headers: {
            'Content-Type': 'application/pdf'
            'Content-Disposition': 'attachment; filename="example.pdf"' // use "inline" instead of "attachment" to display the pdf in the browser
        }
    });
}

Option 3: Using a headless browser

You can use a headless browser like Playwright to generate a pdf file.

Here is a basic example of using it with a sveltekit +server.ts endpoint:

import { chromium } from 'playwright';

export async function GET() {
    const browser = await chromium.launch();
    const page = await browser.newPage();
    await page.goto('https://playwright.dev/');
    await page.emulateMedia({ media: 'print' });
    const pdf = await page.pdf();
    await browser.close();

    return new Response(pdf, {
        headers: {
            'Content-Type': 'application/pdf',
            'Content-Disposition': 'attachment; filename="page-print.pdf"' // use 'inline' instead of 'attachment' to display the PDF in the browser
        }
    });
}