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For C#, the most direct route is PuppeteerSharp’s PDF API: call PdfAsync to save a file, or use PdfDataAsync or PdfStreamAsync when you need the output in memory or as a stream. PuppeteerSharp uses print CSS media by default. If you need lower-level control, Chrome DevTools Protocol (CDP) provides Page.printToPDF, whose options control page geometry, backgrounds, headers and footers, and output transfer.
Choose a C# approach: PuppeteerSharp or direct CDP
Use PuppeteerSharp when you want a page-oriented C# API and a straightforward way to produce a file, byte array, or stream. Use a CDP client directly when you need to call protocol methods and map their parameters yourself. The protocol reference documents the controls available for Page.printToPDF; the exact calling syntax and generated types depend on the C# CDP client you choose.
There is no documented basis here for claiming one approach is faster or more reliable. Whichever route you select, check the API and protocol support against the PuppeteerSharp package and Chrome build you actually deploy. Some protocol fields are experimental.
Print a PDF with PuppeteerSharp
The following is the basic page-level pattern: launch headless Chrome, navigate to a URL, and save a PDF. Use the PuppeteerSharp package and browser-launch setup appropriate to your project; the API documentation describes IPage.PdfAsync(string) and the options overload.
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using PuppeteerSharp;
await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
Headless = true
});
await using var page = await browser.NewPageAsync();
await page.GoToAsync("https://example.com");
await page.PdfAsync("output.pdf");The snippet shows the core calls, not package installation or browser provisioning, which depend on your project and PuppeteerSharp version. Consult the PuppeteerSharp documentation for the package’s current launch and setup requirements.
Choose the output form
PdfAsync(path)writes the PDF to a file.PdfDataAsyncreturns PDF bytes, useful when the caller will store, send, or process the result without first writing a local file.PdfStreamAsyncreturns a stream for stream-based workflows.
PuppeteerSharp also documents options overloads for PDF generation. Use the options object when you need to control layout or printing behavior rather than relying on defaults.
Print CSS or screen CSS
PuppeteerSharp generates PDFs using print media by default. That means CSS inside @media print can affect the result. If the PDF should use screen styles instead, set the page’s media type before generating it:
await page.EmulateMediaTypeAsync(MediaType.Screen);
await page.PdfAsync("output.pdf");Make this choice deliberately: screen media can preserve screen-oriented styling, while print media can apply print-specific layout and visibility rules.
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Control layout with CDP’s Page.printToPDF
Chrome DevTools Protocol’s Page domain exposes Page.printToPDF, described by the protocol reference as “Print page as PDF.” Its parameters let a client specify page geometry, print styling, header/footer behavior, page ranges, and transfer mode. A direct C# CDP call requires using the method and parameter types exposed by your chosen client; do not assume every client uses identical names or supports every field.
Page size, orientation, scale, and margins
The protocol documents paper width and height in inches, orientation, scale, and margins as separate controls. Its stated defaults are 8.5 by 11 inches for paper dimensions, scale 1, and margins of 1 cm. By default, printing covers all pages.
preferCSSPageSize determines how CSS @page sizing interacts with protocol paper dimensions. When enabled, the CSS page size takes precedence. Otherwise, content is scaled to fit the paper dimensions supplied to the protocol. Treat paper size, orientation, scale, and margins as independent layout decisions; changing one does not replace the others.
Backgrounds and header/footer templates
printBackground is false by default. Enable it if the design depends on background colors or graphics. Header and footer display is also off by default. When enabled, the protocol accepts HTML templates; documented placeholder classes include date, title, url, pageNumber, and totalPages.
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Page ranges and transfer mode
The protocol supports selecting page ranges and choosing an output transfer mode. These are protocol-level capabilities; confirm the generated parameter types and support in your CDP client and target Chrome build, especially for fields marked experimental in the live reference.
Use Chrome’s command line when C# is not required
For a quick command-line capture, Chrome’s Headless documentation describes --print-to-pdf, which saves a page to output.pdf in the working directory. To suppress the date/time header and URL/page-number footer, use --no-pdf-header-footer. An older flag name, --print-to-pdf-no-header, was previously used, so verify flag compatibility if targeting an older Chrome installation.
chrome --headless --print-to-pdf --no-pdf-header-footer https://example.comChrome also documents --timeout, which sets a maximum wait before capture even if loading continues, and --virtual-time-budget, which fast-forwards time-dependent JavaScript such as timers. These are CLI options, not automatically PuppeteerSharp API options.
Google’s Headless documentation says unified new Headless mode became available in Chrome 112. Because Chrome’s Headless article also contains historical information about defaults and planned changes, check the installed Chrome version rather than relying on old default-mode guidance.
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Set up an output that matches the page
- Choose the capture route. Use PuppeteerSharp for a convenient C# page API; use direct CDP when you need protocol-level access and can map its types through your client.
- Choose the media type. Keep PuppeteerSharp’s default print media for print-specific CSS, or call
EmulateMediaTypeAsync(MediaType.Screen)first when the PDF should reflect screen styles. - Set geometry. Decide paper dimensions, orientation, scale, margins, and whether CSS
@pagesizing should take precedence. - Set visual options. Turn on background printing when needed and configure header/footer templates only if the document calls for them.
- Choose output handling. Save directly with
PdfAsync, or use the byte-array or stream API for downstream processing. - Validate against deployed versions. Check the installed Chrome build, PuppeteerSharp package, and CDP client; verify experimental protocol options before relying on them.
Troubleshoot common PDF issues
The PDF looks different from the browser
Check whether print CSS is active. PuppeteerSharp uses print media by default, so @media print rules may hide, resize, or restyle content. If the desired output is screen styling, emulate screen media before printing.
Background colors or images are missing
Background printing is disabled by default in the protocol. Enable printBackground through the PDF options or CDP parameter mapping supported by your library.
The page size or margins are unexpected
Check the effective paper width and height, orientation, scale, margins, and preferCSSPageSize. CSS @page sizing takes precedence when the preference is enabled; otherwise the content is fitted to the configured paper dimensions.
Unexpected date, URL, or page-number text appears
Header/footer display defaults to false for the protocol. If those elements appear, check the options your wrapper applies. For Chrome CLI use, --no-pdf-header-footer suppresses the command-line header and footer; confirm support on the Chrome version in use.
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A CDP option is rejected or unavailable
Protocol support can vary by Chrome build, and some fields are marked experimental. Compare the method and parameter types generated by your C# client with the protocol reference for the Chrome version you deploy.
JavaScript content is missing from a CLI capture
For command-line captures, Chrome’s --timeout caps how long it waits before capturing, while --virtual-time-budget fast-forwards timers and other time-dependent JavaScript. These controls affect CLI behavior; do not assume they map directly to PuppeteerSharp options.
Performance, reliability, and cost considerations
The documentation cited here does not establish a universal performance or throughput advantage for direct CDP versus PuppeteerSharp, nor does it provide deployment-specific reliability benchmarks. Measure the workflow under your own page mix and runtime conditions before making capacity assumptions. For reproducible results, record the Chrome build, PuppeteerSharp version, CDP client version, and the PDF options used.
Chrome’s headless CLI and a C# library are ways to run browser-based printing; no associated service pricing or per-PDF cost was published. Account for the browser runtime and infrastructure you choose to operate, and validate failure handling for your own workload rather than treating a successful local capture as a production guarantee.
Or skip the browser setup
If you need a screenshot or PDF through an API instead of managing a browser capture flow, ScreenshotNeo accepts one GET request with a URL and can return a PDF. Its cleanup steps accept cookie and consent banners like a visitor and remove 60+ known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks/CAPTCHAs, blank pages, timeouts, failed loads, and cache hits are not billed, and responses identify the page verdict and billing status in X-Page-Verdict and X-Billed headers. It also offers an MCP server with take_screenshot, get_page_info, and capture_pdf tools for AI agents.
Example cURL request:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.pdfSee the ScreenshotNeo API documentation for request parameters and output options. The free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month, with no card required.
Frequently Asked Questions
Can PuppeteerSharp return a PDF without saving it to disk?
Yes. Use PdfDataAsync for bytes or PdfStreamAsync for a stream.
Does Chrome’s CLI timeout wait for every network request to finish?
No. The documented --timeout is a maximum wait; Chrome captures when it is reached even if loading continues.
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