PDF Collaboration Library for Flutter

PSPDFKit Instant is our prebuilt solution for synchronizing annotations across multiple concurrent users, devices, or sessions. It offers developers a self-hosted solution that handles document viewing on any platform, data management, conflict resolution, version tracking, diffing, and merging. It’s a licensable component that’s included as part of Document Engine.

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PSPDFKit SDKs are deployed in some of the world’s most popular applications, such as those made by Autodesk, Disney, UBS, Dropbox, IBM, and Lufthansa.

Key Capabilities

  • Real time — Sync edits and annotations to a server or across devices

  • Self-hosted — Maintain complete control over your data

  • Device agnostic — Consistent UX across web, mobile, and desktop clients

  • Conflict resolution — Handle simultaneous concurrent edits

  • Secure authentication — Easy integration with existing systems

  • Data management — Separate layer for annotation and form data

  • User permissions — Fine-grained control over what users can see or edit

Guides for Instant Synchronization

Get Started with PSPDFKit Instant
How to get started with PSPDFKit Instant

Learn how authentication works

Learn about the Instant API and how to use it for displaying documents

Annotation Sync
How to configure annotation synchronization to Document Engine

Instant Layers
Learn about Instant layers and how they can be used

How to view, add, and delete comments in PDF documents

Offline Support
Learn how Instant works with offline devices or unstable connections

Document State
Learn how a document transitions to different states over its lifecycle

Free Trial

Enjoy unlimited trial usage of all our products. Get guidance and tech support from developers who built the product, and get started within minutes.