iText vs. Nutrient

For teams that need more than backend PDF generation, Nutrient is the strongest iText alternative. It covers the same server-side work — generation, conversion, signing, OCR — and adds a client-side viewer, in-browser editing, real-time collaboration, generative AI, and native mobile SDKs, all under straightforward commercial licensing with no AGPL copyleft. iText remains the better choice if your work is centered on code-level PDF authoring, advanced complex-script typography, or the deepest signature cryptography.

iText uses dual licensing. The open source edition is free under AGPLv3, but that license carries copyleft obligations (see below). The commercial edition is a volume-based subscription, and iText doesn’t publish list prices, so cost depends on your processed-document volume and contract. Nutrient is commercial and component-based — you license only the features you deploy. For a quote scoped to your stack, talk to a solutions engineer.

iText is free under AGPLv3, but AGPLv3 is a strong copyleft license. If you use the free edition inside an application that users interact with over a network — most web apps and SaaS products — the license can require you to make the complete source code of your calling application available to those users. The AGPL edition also requires keeping iText’s producer-line metadata in every generated PDF. To avoid these obligations, you need a commercial license. Nutrient has no copyleft tier, so your application source stays private regardless of deployment.

It depends on the job. iText is better for code-level PDF authoring with a fluent layout engine, advanced complex-script typography (pdfCalligraph), and the deepest signature cryptography (FIPS 140-2, eIDAS trusted lists, B-LTA). Nutrient is better when you need a viewer your users see, in-browser annotation and editing, real-time collaboration, AI- and VLM-based extraction, native mobile apps, or licensing without AGPL copyleft. Many teams pick iText for pure backend generation and Nutrient when documents are part of the user-facing product.

For most .NET and C# workflows, yes — Nutrient .NET SDK (available via NuGet) handles PDF manipulation, conversion, signing, OCR, data extraction, and ZUGFeRD/Factur-X e-invoicing. The main exception is code-level document building: iTextSharp lets you construct PDFs paragraph by paragraph with a fluent API, whereas Nutrient generates from HTML, Word templates, and images. If that authoring model is central to your app, weigh it carefully.

Yes, and the rendering engine is the key difference. Nutrient’s Java and Python SDKs convert HTML to PDF through a Chrome headless shell, so modern CSS — Flexbox, Grid, and web fonts — renders with full fidelity. iText’s pdfHTML add-on uses a custom CSS parser rather than a browser engine, so modern CSS layouts can fail or render incorrectly. If high-fidelity HTML rendering matters, Nutrient’s Chrome-based path has the edge.

Nutrient generates PDFs from HTML, Word templates, and images, which covers most document-generation use cases. What it doesn’t provide is iText’s code-level fluent API for laying out paragraphs, tables, and text runs from scratch. If your generation logic is heavily programmatic and layout-driven, iText’s layout engine is the stronger fit; if you generate from templates or HTML, Nutrient is a clean match.

No. Nutrient is a commercial SDK. Its rendering core is built on a heavily optimized fork of PDFium — the open source engine behind Chromium — but the SDK and its OCR, extraction, collaboration, and AI features are proprietary and commercially licensed. Unlike iText, there’s no AGPL or open source edition, which means there are no copyleft obligations to manage.

Yes. Teams moving from iText or iTextSharp to Nutrient usually start by separating backend generation/signing from the user-facing parts of their product. Nutrient maps cleanly onto conversion, signing, OCR, extraction, and forms, and it replaces custom-built viewers and editors with supported SDKs. Code-level document authoring is the area that needs the most planning. Schedule a call with our solutions engineering team for a scoped migration estimate.