The best PDF.js alternative for modern web apps

Nutrient — formerly known as PSPDFKit — includes eSignatures, certificate-based digital signatures, annotation types (sticky notes, stamps, ink, shapes), document redaction, content editing (text and image modification within PDFs), real-time collaboration, document comparison, Office file viewing (Word, Excel, PowerPoint), image file viewing, PDF/A archival compliance, OCR for scanned documents, PDF generation, and measurement tools. PDF.js is a rendering engine — it displays PDF pages but provides none of these capabilities natively. Every feature listed above requires either custom development or a separate integration when building on PDF.js.

PDF.js has no built-in eSignature or digital signature capability. It doesn’t support signature fields, certificate-based digital signatures, or any signing workflow. Implementing signatures on top of PDF.js requires building the entire feature from scratch — UI, cryptographic signing, certificate management, and PDF embedding. Nutrient includes eSignatures and certificate-based digital signatures as production-ready, maintained components.

PDF.js is a PDF-only renderer and cannot display Word, Excel, or PowerPoint files natively. If your application needs to show Office files, you must integrate and maintain a separate server-side conversion service alongside PDF.js. Nutrient renders Office files natively within the same viewer — no separate service or additional integration required.

PDF.js presents significant challenges for applications requiring Section 508, ADA, or WCAG compliance. Its text selection behavior and reading order can be inconsistent, causing failures in automated accessibility audits. For regulated deployments in government, healthcare, or financial services, these gaps require substantial custom engineering to remediate — with no guarantee of full compliance. Nutrient is built to WCAG 2.2 standards, making it suitable for accessibility-sensitive deployments without custom remediation work.

PDF.js provides PDF page rendering only. Building a production document experience on top of it means engineering custom annotation tools, a signing workflow, Office file conversion, accessibility remediation, mobile touch support, and a UI component library — each a discrete engineering investment. The cumulative cost is typically comparable to or greater than a commercial SDK license before accounting for the ongoing maintenance burden as PDF.js releases breaking changes requiring integration updates. Nutrient replaces that engineering effort with a single, maintained SDK that includes all of these as production-grade components.

PDF.js has known mobile issues — pinch-to-zoom and touch interactions are inconsistent across devices and browsers. Annotation rendering on mobile is particularly unreliable. Nutrient provides native SDKs for iOS and Android alongside the web viewer, ensuring consistent document behavior across all platforms without custom workarounds.

PDF.js is free for rendering only. The engineering cost of building production-grade annotation, signing, Office conversion, accessibility compliance, and mobile support on top of it typically meets or exceeds the cost of a commercial SDK license — before accounting for the ongoing maintenance burden as PDF.js releases breaking changes. Nutrient provides all of these as production-ready, maintained components from a single vendor, with contractual support. For applications where document workflows are non-trivial, Nutrient eliminates a significant custom-engineering investment that PDF.js’s zero licensing cost alone doesn’t justify.

Migrating from PDF.js to Nutrient involves two parts. Replacing the rendering layer is simple — you swap the PDF.js initialization for Nutrient Web Viewer SDK and point it at the same PDF files. Migrating stored annotations requires additional work: PDF.js persists annotations in its own JSON format, while Nutrient uses XFDF. Any annotations your users have already saved will need to be converted to XFDF format before they’re accessible in Nutrient. Nutrient’s 30-day free trial with no trial key required lets you validate the full integration against your existing documents before committing.

Nutrient (formerly PSPDFKit) is a leading production-grade alternative to PDF.js. Where PDF.js provides rendering only, Nutrient includes annotation, eSignatures, digital signatures, Office file viewing, redaction, content editing, OCR, PDF/A compliance, real-time collaboration, and document comparison — all as maintained SDK components with contractual support. Nutrient also provides first-class integrations for React, Angular, Vue, and other modern JavaScript frameworks, as well as native SDKs for iOS and Android. A 30-day free trial with no trial key required is available to evaluate the full feature set.

Nutrient Web Viewer SDK provides first-class integrations for React, Angular, Vue, and other modern JavaScript frameworks. The SDK ships with framework-specific wrappers and TypeScript typings, so you can embed a fully featured PDF viewer in your React or Angular application with minimal setup. For teams currently using PDF.js with a community framework wrapper (such as react-pdf), Nutrient replaces both the viewer and the wrapper with a single maintained integration — including all features PDF.js wrappers cannot provide, such as annotation, signing, and Office file viewing.