Instant Sync and Collaboration

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, the backend for the Web Server-Backed operational mode of PSPDFKit for Web.

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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.


Instant sync and collaboration is available when using the Web SDK with Document Engine in server-backed operational mode.

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

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

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

Permissions Overview
Learn about permissions and how they’re configured with JWTs

Content Ownership
Learn how content ownership changes during the document lifecycle

Set Permissions
How to set document permissions using JWTs

Edit Permissions
How to edit permissions of annotations, form fields, and comments

Example of a Permissions Implementation
See an example implementation for a tenant and landlord application

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