---
title: "PDF collaboration library for iOS | Nutrient SDK"
canonical_url: "https://www.nutrient.io/guides/ios/instant-synchronization/"
md_url: "https://www.nutrient.io/guides/ios/instant-synchronization.md"
last_updated: "2026-06-19T09:21:00.281Z"
description: "Unlock the secrets of Instant synchronization on iOS with our comprehensive guide. Maximize productivity and efficiency today."
---

# PDF collaboration library for iOS

Nutrient 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](https://www.nutrient.io/guides/document-engine.md), which can be used together with Web SDK.

[Try for Free](https://www.nutrient.io/try)

[Free Trial](https://www.nutrient.io/try/)




## 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 Nutrient Instant](https://www.nutrient.io/guides/ios/pspdfkit-instant/getting-started.md)**\
How to get started with Nutrient Instant

**[Authentication](https://www.nutrient.io/guides/ios/instant-synchronization/authentication.md)**\
Learn how authentication works

**[Usage](https://www.nutrient.io/guides/ios/pspdfkit-instant/usage.md)**\
Learn about the Instant API and how to use it for displaying documents

**[Annotation sync](https://www.nutrient.io/guides/ios/pspdfkit-instant/syncing.md)**\
How to configure annotation synchronization to Document Engine

**[Instant layers](https://www.nutrient.io/guides/ios/pspdfkit-instant/instant-layers.md)**\
Learn about Instant layers and how they can be used

**[Comments](https://www.nutrient.io/guides/ios/comments/introduction-to-instant-comments.md)**\
How to view, add, and delete comments in PDF documents

**[Offline support](https://www.nutrient.io/guides/ios/pspdfkit-instant/offline-support.md)**\
Learn how Instant works with offline devices or unstable connections

**[Document state](https://www.nutrient.io/guides/ios/pspdfkit-instant/instant-document-state.md)**\
Learn how a document transitions to different states over its lifecycle

**[Data protection](https://www.nutrient.io/guides/ios/pspdfkit-instant/data-protection.md)**\
How to configure the data protection level for iOS data protection

**[FAQ](https://www.nutrient.io/guides/ios/instant-synchronization/faq.md)**\
Find answers to common questions about Instant synchronization

**Call to Action**

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[Learn More](https://www.nutrient.io/sdk/ios/getting-started.md)
---

## Related pages

- [Nutrient Instant and iOS data protection](/guides/ios/pspdfkit-instant/data-protection.md)
- [Nutrient Instant and the document state](/guides/ios/pspdfkit-instant/instant-document-state.md)
- [Streamline PDF annotation syncing on iOS](/guides/ios/pspdfkit-instant/syncing.md)
- [Adding comments to PDFs on iOS](/guides/ios/comments/introduction-to-instant-comments.md)
- [Client authentication in Nutrient Instant](/guides/ios/instant-synchronization/authentication.md)
- [Integrating real-time collaboration into your iOS application](/guides/ios/pspdfkit-instant/getting-started.md)
- [Frequently asked questions](/guides/ios/instant-synchronization/faq.md)
- [Nutrient Instant usage](/guides/ios/pspdfkit-instant/usage.md)
- [Create PDF annotation layers on iOS](/guides/ios/pspdfkit-instant/instant-layers.md)
- [Seamless offline PDF annotation and synchronization](/guides/ios/pspdfkit-instant/offline-support.md)

## Pages in this section

- [Editing user permissions](/guides/ios/collaboration-permissions/changing-permissions.md)
- [Define document collaboration permissions effectively](/guides/ios/instant-synchronization/permissions/content-ownership.md)
- [Enhance collaboration with fine-grained permissions](/guides/ios/collaboration-permissions/introduction-to-collaboration-permissions.md)
- [Setting user collaboration permissions](/guides/ios/collaboration-permissions/defining-permissions.md)