Start building in 60 seconds
Both CobaltPDF libraries run in free evaluation mode straight from NuGet — no registration, no product key, no time limit, and free to use even in production. Just install and go.
Pick an engine and install
Run a single command in your .NET project — each package includes everything, engine bundled. Not sure which? Start with CobaltPdf (Chromium) — it handles everything and runs natively on Windows and Linux. Pick CobaltPdf.WebKit for low-memory, high-volume rendering on Linux containers. Compare the engines — one license key activates both.
dotnet add package CobaltPdf
Click to copy
dotnet add package CobaltPdf.WebKit
Click to copy
Write your first PDF
No product key needed — the library works immediately in free evaluation mode.
using CobaltPdf;
await new CobaltEngine()
.RenderHtmlAsPdfAsync("<h1>Hello, CobaltPDF!</h1>")
.SaveAsAsync("hello.pdf");That’s it — you’re generating PDFs
Evaluation mode is fully functional with every feature enabled, including in production. The only difference is a small watermark on output. When you want to remove the watermark, purchase a license key on the pricing page.
No time limit
Evaluate for as long as you need. Evaluation mode never expires.
Full feature access
Every API is available — headers, footers, margins, JavaScript rendering, and more.
No key required
Simply install the NuGet package. No registration, no product key entry.
Watermark only
The only difference between evaluation and paid mode is a small watermark on generated PDFs.
Ready for production?
Remove the watermark and unlock priority support with a license key.