The Tool Desk
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Choose EvoPdf Next or Classic first
EvoPdf has two editions with different rendering engines, packages, namespaces, and APIs. EvoPdf describes Next as its current Chromium-based engine and lists Windows, Linux, and macOS support. Classic is the original engine and has platform limitations. The vendor also notes that options and APIs changed between editions, so an existing Classic integration should not be treated as a drop-in Next conversion. Compare target operating system, .NET runtime, required rendering behavior, and migration effort before choosing. See EvoPdf Next product information and migration context.
The examples below use Next. Its quick start lists version 14.60.1 on the page observed September 29, 2026; package versions can change, so check the current vendor instructions when installing. EvoPdf lists HTML5, CSS3, JavaScript, web fonts, and SVG support for Next, but those are vendor-stated capabilities, not a guarantee that every site renders identically to a particular browser.
Install the package for your deployment target
For a Windows project, the vendor quick start gives this command:
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dotnet add package EvoPDF.Next.HtmlToPdf.WindowsThe quick start says the Linux and macOS packages work in the same way. Select the package that matches the actual deployment platform and verify its supported runtime rather than assuming the Windows package is appropriate for a Linux or macOS host. Use the EvoPdf.Next namespace for Next. Classic documentation uses EvoPdf instead.
Convert a URL or HTML string in C#
This runnable minimal example follows the vendor’s Next quick start. It writes one PDF from a live URL and another from an HTML string:
using EvoPdf.Next;
var converter = new HtmlToPdfConverter();
byte[] pdf = converter.ConvertUrl("https://www.evopdf.com");
File.WriteAllBytes("page.pdf", pdf);
pdf = converter.ConvertHtml("<b>Hello</b>", "https://www.evopdf.com");
File.WriteAllBytes("string.pdf", pdf);The sample uses File; include using System.IO; in projects where implicit global usings are not enabled. The complete installation and platform quick start is at EvoPdf’s .NET quick start.
Convert an existing webpage with ConvertUrl
Use ConvertUrl when the content already exists at a reachable URL. The converter loads that address and returns the resulting PDF as a byte[]. Writing the bytes with File.WriteAllBytes creates a local file; in a web application, you can instead return the byte array from an endpoint with an appropriate PDF content type and download filename.
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The URL must be accessible from the machine running your application, not merely from your development browser. Pages that depend on client-side JavaScript, external assets, authentication, or network access should be tested in the target hosting environment.
Convert an HTML string with ConvertHtml
Use ConvertHtml when your application generates markup or stores it as a string. The method accepts the HTML and, optionally, a base URL. The base URL is important when markup contains relative resource paths such as images/logo.png or css/print.css. Without a suitable base, the renderer has no reliable origin from which to resolve those references. The API documents HTML-string conversion and its base URL parameter in the Classic ConvertHtml reference; the same base-URL principle is described in the Next converter overview.
For self-contained markup with inline styles and no relative assets, a base URL may not be needed. If the document uses remote resources, use a base URL appropriate to those assets and ensure the conversion host can reach them.
Save the PDF, return it, or use asynchronous methods
The converter’s overview documents in-memory output and file-output methods, including asynchronous variants. The sample above keeps the result in memory as bytes and then saves it. This is useful when you need to attach the PDF to an email, return it from an API, or apply additional processing before writing it to storage. For larger or concurrent workloads, select the synchronous or asynchronous method that fits the host’s request model and test memory and throughput under representative use; the cited documentation does not establish a performance benchmark.
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For an HTTP response, set the response content type to application/pdf and return the generated bytes. Decide whether to stream or buffer based on your framework and document sizes. Ensure errors during conversion are handled before committing a response body, so the endpoint can return a meaningful failure status rather than a partial file.
Make output match the source page
PDF fidelity depends on the HTML, resources, and rendering behavior, not just the conversion call. Test pages that resemble production input before deploying, especially where layout matters.
- Fonts and images: Confirm referenced assets resolve from the conversion machine, including any relative paths and external URLs.
- JavaScript-rendered content: Check that the content your application needs is present at conversion time. Test dynamic pages rather than assuming a successful URL load includes all client-rendered elements.
- Print styling: Inspect the PDF for intended page breaks, backgrounds, widths, and print-specific CSS.
- Platform differences: Validate on the same operating system and runtime used in production, using the matching EvoPdf edition and package.
- Representative documents: Include long pages, tables, unusual fonts, SVG, and any resource-heavy layouts your application actually processes.
EvoPdf Next’s product material lists support for HTML5, CSS3, JavaScript, web fonts, and SVG. That vendor feature list is not an independent fidelity test; compare the generated PDF with the expected output on your actual pages.
License and production deployment
The vendor says evaluation output carries a demo watermark until a license key is set. The Classic LicenseKey reference also documents watermarking when the key is null. Check the key configuration for the edition you use and verify the current license terms for your deployment before releasing generated PDFs. See the Classic LicenseKey API page for its evaluation behavior.
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On the quick-start page observed September 29, 2026, EvoPdf listed an HTML-to-PDF Deployment License at USD 450 and a Company License at USD 1,200. The page described the former as covering one application on one server for the licensee’s own application, and the latter as allowing unlimited developers, applications, and servers and redistribution in the licensee’s applications. These are time-sensitive vendor-listed prices and terms, not a substitute for checking the current licensing page and agreement before purchase.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Troubleshooting common conversion problems
Relative images, CSS, or fonts are missing
Likely cause: The HTML string uses relative paths without a base URL, or the base URL does not point to the directory those paths are relative to. Fix: Pass a suitable base URL to ConvertHtml and verify the resource is reachable from the machine performing conversion.
The PDF is blank or missing dynamic content
Likely cause: The requested page or its scripts and resources did not load as expected in the deployment environment. Fix: Test the URL from the server, check its access requirements and external dependencies, and confirm that the final content exists when conversion runs. The available documentation does not specify a universal wait setting or guarantee for every dynamic site.
The output has a demo watermark
Likely cause: The converter is running in evaluation mode or its license key has not been configured for the edition in use. Fix: Set the appropriate production key and verify the applicable license scope. Do not assume a Classic configuration automatically carries over to Next.
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Likely cause: The installed package and code sample belong to different editions, or the package does not match the target platform. Fix: For the Next sample, install the correct Next package and use EvoPdf.Next; Classic uses EvoPdf. Check the current quick start for platform-specific package names.
PDF layout differs from browser output
Likely cause: The source page relies on fonts, JavaScript, print styles, or external resources that behave differently in the conversion environment. Fix: Reproduce the issue with representative content on the production platform, make required assets available, and inspect both screen and print-specific styling. No independent benchmark or universal fidelity result is established by the vendor pages cited here.
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If the job is to capture a rendered webpage rather than build a PDF from application-generated HTML, ScreenshotNeo is a separate website screenshot API and MCP server for developers. Its one-request API returns PNG, JPEG, WebP, or PDF output; it is an alternative for page capture, not a replacement for EvoPdf’s HTML-string conversion workflow. Example cURL request, saving a WebP screenshot:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpSee the ScreenshotNeo API documentation for request options, including PDF capture. Cookie banners are accepted and removed before capture, along with known consent platforms, newsletter popups, and chat widgets; each step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and responses identify the page verdict and billing status. An MCP server lets AI agents use screenshot and PDF-capture tools. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo’s free plan.
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Does EvoPdf convert a local HTML file path directly?
The examples here establish URL and HTML-string conversion; check the current edition’s API reference for a specific local-file overload rather than assuming one.
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