CobaltPDF
Generate pixel-perfect PDFs from HTML in any .NET app
CobaltPDF launched on June 2, 2026 with 3 votes, #6,658 of 22,647 launches that month and more than 50% of that year's launches.
What it does
CobaltPDF turns HTML, CSS and JavaScript into pixel-perfect PDFs from anyNET app. It drives a real Chromium engine via Playwright, so your PDF matches the browser exactly — flexbox, grid, web fonts and JS-rendered charts all included. One NuGet package, browser pooling for concurrent load, no native print drivers to babysit. Free unlimited evaluation.
Convert HTML to PDF in C# with CobaltPDF. Pixel-perfect Chromium rendering, one fluent API, one license.
Generate pixel-perfect PDFs from any URL or HTML in C# — headers, watermarks, encryption and more, in a few lines of code. Powered by a managed Chromium browser pool for maximum fidelity and speed — one fluent API, one license. * Free evaluation mode runs without a license key for as long as you need. Output is watermarked until a license is activated. using CobaltPdf ; // Render a URL to PDF await new CobaltEngine () . RenderUrlAsPdfAsync ( "https://example.com" ) . SaveAsAsync ( "website.pdf" ); // Render an HTML string to PDF await new CobaltEngine () . RenderHtmlAsPdfAsync ( "<h1>Hello, World!</h1>" ) . SaveAsAsync ( "hello.pdf" ); // Render a local HTML file to PDF await new…from cobaltpdf.com
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Hello HN! It kept surprising me how much of a hassle it is to generate a PDF with decent HTML5 rendering from my SaaS apps. I tried several free libs and APIs but ended up with botched rendering a lot of times. So I set out to simplify this chore by creating an AWS hosted HTML to PDF conversion API that's based on Chrome. This API will allow a dev to just send the HTML to our API and get a PDF in response without having to worry about running and managing Chrome somewhere in their infra. I just finished the first version of my landing page and hosted pdf generation API…

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