iOS PDF Library

ComPDF for iOS is an SDK for viewing, annotating, editing, and signing PDFs, enabling developers to seamlessly integrate PDF functionalities into Swift or Objective-C iOS applications.

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Important: Read Before Upgrading to 3.0.0

ComPDFKit iOS SDK 3.0.0 includes several breaking API changes. Before building an existing project with this release, review the following changes to avoid compilation failures, annotations not being added to pages, or unexpected Undo/Redo behavior.

1. Annotation creation and insertion: Replace initWithDocument: with initWithPage:document: and addAnnotation: with updateAndAddAnnotation:. In Swift, use updateAndAdd(_:).
2. Stamp creation: Use the new dedicated initializers for standard, text, date, and image stamps instead of setting deprecated content properties after initialization.
3. Widget names: Replace CPDFAnnotationButtonWidget.h and CPDFAnnotationButtonWidget with CPDFButtonWidgetAnnotation.h and CPDFButtonWidgetAnnotation.
4. Cross-document page insertion: CPDFPage no longer conforms to NSCopying. Replace [page copy] with addPage:atIndex:, or add(_:at:) in Swift.
5. Annotation copying and Undo/Redo: Copy annotations with copyToPage:. Before deletion, call copyForUndoRestore; restore with copyToPage:, then call releaseUndoRestoreDocument after success.
6. Annotation notifications: Replace CPDFPageDidAddAnnotationNotification with CPDFPageDidUpdateAnnotationNotification, including the corresponding Swift notification name.
7. Temporary style annotations: Do not bind temporary annotations to a page when only reading default styles. Doing so can add them to the page and affect Undo/Redo.

Before releasing an app with 3.0.0, search the project for initWithDocument:, addAnnotation, CPDFPageDidAddAnnotation, CPDFAnnotationButtonWidget, [page copy], and CPDFRenderModeMetal. Remove these old usages unless the documentation explicitly identifies an unchanged non-annotation API.

Key Capabilities

Customizable UI

Simple, easy to use, and highly customizable

Low-Level APIs

In Swift or Objective-C for fine-grained control, highly extensibility

High Fidelity

Accurate and reliable PDFium-based rendering engine

Prebuilt Features

Annotate, edit, sign, form fill, redact, and more

PDF Capabilities

PDF Viewer

How to quickly embed a highly configurable PDF viewer

Annotations

How to create, edit, delete, flatten, import, and export annotations

Signatures

How to add electronic and digital signatures on PDF documents

Forms

How to create, fill, edit, delete, flatten, import, and export forms

Content Editor

How to add, edit, move, and delete text and images, replace content

Document Editor

How to merge or split documents, manipulate pages, and more

Redaction

How to redact PDFs to protect sensitive data

Conversion

How to convert PDF from/to MS Office, images, HTML, CSV, and more

Essential Guides

Open a document

How to open a local PDF, and create a new PDF

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Save a document

How to save a document by incremental saving and full saving

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User Interface

How to customize toolbars, buttons, the properties panels, and more

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Framework Support

ComPDF for iOS is compatible with Flutter, React Native, .NET for iOS, Xamarin.iOS, Ionic, and Cordova.

FlutterReact Native.NET for iOSXamarin.iOSIonicCordova

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