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In C#, the simplest documented route to a PDF from headless Chrome is PuppeteerSharp’s IPage.PdfAsync method. For lower-level control, Chrome DevTools Protocol provides Page.printToPDF. Choose the library when you want a concise C# API; use CDP directly when your client needs protocol-level options. In either case, check the API and experimental options against the Chrome and library versions you deploy.
Choose a C# approach
PuppeteerSharp wraps Chrome’s page-printing capability in a page-level API. Its documentation provides PdfAsync overloads for writing a PDF to a path, PdfDataAsync for receiving bytes, and PdfStreamAsync for a stream. The lower-level protocol method is Page.printToPDF, described by the Chrome DevTools Protocol as “Print page as PDF.”
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| Approach | Best fit | Output | What to check |
|---|---|---|---|
| PuppeteerSharp | Typical C# applications that want a page-oriented API. | File, byte array, or stream, depending on the method. | Match PuppeteerSharp APIs and options to the package version and Chrome build you run. |
| Direct CDP | Applications already using a Chrome DevTools Protocol client and needing protocol controls. | Protocol response; handling and decoding depend on the client. | Generated types and method-call syntax vary by client. Verify experimental fields against the deployed Chrome version. |
The documentation establishes these API shapes and protocol controls, but does not establish a universal performance advantage for either approach.
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Add the PuppeteerSharp NuGet package to your project, then use its documented page API. This example writes a PDF to a path; it does not claim a particular package or Chrome version, so use the API signatures supported by the versions you pin.
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using PuppeteerSharp;
var url = "https://example.com/";
await new BrowserFetcher().DownloadAsync();
await using var browser = await Puppeteer.LaunchAsync(new LaunchOptions
{
Headless = true
});
await using var page = await browser.NewPageAsync();
await page.GoToAsync(url);
await page.PdfAsync("output.pdf");PdfAsync uses print CSS media by default. If the document should reflect screen styles instead, set the media type before generating the PDF:
await page.EmulateMediaTypeAsync(MediaType.Screen);
await page.PdfAsync("output.pdf");Use PdfDataAsync when the next step needs a byte array, or PdfStreamAsync when it can consume a stream. These are alternatives to saving directly to a file, not different rendering modes.
Control page size, margins, and print appearance
Chrome’s Page.printToPDF protocol method exposes the print controls below. PuppeteerSharp provides PDF options as well, but confirm exact property names and availability in the package version you use rather than copying protocol field names blindly into a library object.
| Control | Effect and documented default |
|---|---|
| Orientation | Chooses portrait or landscape page orientation. |
| Scale | Scales printed content; the protocol default is 1. |
| Paper width and height | Set page dimensions. The protocol defaults are 8.5 by 11 inches. |
| Margins | Set page margins; the protocol default is 1 cm. |
| Page ranges | Restrict output to selected pages; by default, all pages are printed. |
| Print background | Includes background graphics and colors. This is false by default, so enable it when the design relies on backgrounds. |
| Header and footer | Displays print header/footer templates when enabled; display is false by default. Supported placeholder classes include date, title, url, pageNumber, and totalPages. |
preferCSSPageSize |
When enabled, lets CSS @page size take precedence over protocol paper dimensions. Otherwise, content is scaled to fit the specified paper. |
| Transfer mode | Controls how PDF data is transferred by the protocol. Check support and behavior in the protocol version exposed by the Chrome build and CDP client. |
Some protocol fields are marked experimental in the live reference. Their presence in documentation does not guarantee support in every Chrome build or generated client.
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- PRINT FOR LONGER — Up to 2 years of ink in the box² (and with every replacement ink set) for fewer out-of-ink frustrations with this wireless printer
- ZERO CARTRIDGE WASTE — Epson EcoTank printer helps reduce the amount of cartridge waste ending up in landfills; Cartridge-free printer uses high-yield ink bottles; Each replacement ink bottle set is equivalent to about 100 individual ink cartridges⁴
Use the Chrome command line when C# is not required
Chrome’s headless command-line interface can print a target page without an application wrapper:
chrome --headless --print-to-pdf=output.pdf https://example.com/Chrome documents --print-to-pdf as saving a PDF in the working directory. Add --no-pdf-header-footer to suppress the date/time header and URL/page-number footer:
chrome --headless --print-to-pdf=output.pdf --no-pdf-header-footer https://example.com/The older flag name --print-to-pdf-no-header was used previously, so check compatibility if you target older Chrome versions. For pages with timing-dependent content, Chrome’s CLI documentation describes --timeout as a maximum wait after which it captures even if loading continues, and --virtual-time-budget as a way to fast-forward time-dependent JavaScript such as timers. These are CLI flags; do not assume they are PuppeteerSharp options.
Account for print CSS and loading behavior
Print styles versus screen styles
PDF generation through PuppeteerSharp uses print media by default. This means CSS inside @media print can change or hide content in the PDF. If the desired result is the screen presentation, call EmulateMediaTypeAsync(MediaType.Screen) before printing.
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Pages that render after navigation
A navigation call and a finished PDF do not necessarily mean an application has completed every delayed update. If important content appears only after scripts or timers run, decide how much waiting the application requires and verify the resulting document. The Chrome CLI timing flags can help in CLI workflows; the cited material does not establish equivalent PuppeteerSharp controls or defaults, so use that library’s documentation for its wait APIs.
Backgrounds and page geometry
Check the PDF with backgrounds explicitly enabled if color blocks, logos, or other graphics disappear. For page-size mismatches, determine whether geometry is coming from CSS @page or protocol paper dimensions and configure preferCSSPageSize accordingly.
Troubleshoot common PDF problems
- The PDF uses unexpected fonts, spacing, or hidden elements: inspect the page’s print CSS. If you want screen styling, emulate screen media before calling
PdfAsync. - Background colors or images are missing: print backgrounds are off by default in the protocol. Enable the background option supported by your PuppeteerSharp version or CDP client.
- Paper dimensions do not match the site’s CSS: check whether
@pageshould control the size. SetpreferCSSPageSizewhen CSS page size should take precedence; otherwise content is scaled to fit the protocol paper dimensions. - Headers or footers appear unexpectedly, or are absent: protocol header/footer display defaults to false. When enabled, inspect the header/footer templates and their placeholder classes; for CLI capture, use the supported suppression flag for the Chrome version in use.
- Content that loads late is missing: check whether the page is waiting on asynchronous work, timers, or continued loading. The CLI offers timeout and virtual-time controls, but confirm the correct waiting mechanism for your C# library and its version.
- A protocol option fails or is missing from generated types: verify the Chrome protocol version, the CDP client’s generated types, and whether the field is experimental. Do not assume every documented field exists in every deployed combination.
- The CLI flag is rejected: check the installed Chrome version and use its supported flag name; the header-suppression flag has had an older name.
Version, reliability, and cost considerations
Chrome’s unified new Headless mode became available in Chrome 112, according to the Chrome Headless documentation. That is a historical availability fact, not a guarantee about which mode a current installation selects. Check the Chrome version and flags in the environment that actually runs the job.
The protocol reference is live, and some parameters are experimental. Record the Chrome and PuppeteerSharp versions used by the application, validate output after upgrades, and avoid relying on experimental options without checking their support. The cited documentation provides no comparative throughput, latency, memory, or reliability benchmark, so those should be measured in your own workload rather than inferred from the API choice.
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Or skip the browser setup
If you need a hosted capture rather than managing headless Chrome, ScreenshotNeo is a website screenshot API that can return PNG, JPEG, WebP, or PDF. One GET request can capture a URL; see the ScreenshotNeo API documentation for PDF and other options.
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com -o shot.webpScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture, and each step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits cost nothing; response headers identify the page verdict and whether the request was billed. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for AI agents and MCP clients. The Free plan includes 1,000 shots a month with no card; paid plans start at $5 for 3,000 shots.
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Does PuppeteerSharp print screen CSS by default?
No. It uses print CSS media by default; emulate screen media before PDF generation when you need screen styles.
Which CDP method prints a page to PDF?
Use the Page-domain method Page.printToPDF; the exact invocation depends on the C# DevTools Protocol client.
Can I return PDF bytes instead of saving a file?
Yes. PuppeteerSharp documents PdfDataAsync for bytes and PdfStreamAsync for a stream.
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