Asynchronous image downloader with cache support as a UIImageView category

What's New

5.8.4 - 5.8 Patch



  • Try to copy the local NSMutableDictionary before calling CGImageSourceCreateImageAtIndex, try to solve the rare crash inside ImageIO call stack #3052
  • Fix race condition when use transition but canceling an operation #3053

Build Status Pod Version Pod Platform Pod License Carthage compatible SwiftPM compatible Mac Catalyst compatible codecov

This library provides an async image downloader with cache support. For convenience, we added categories for UI elements like UIImageView, UIButton, MKAnnotationView.


Supported Image Formats

  • Image formats supported by Apple system (JPEG, PNG, TIFF, HEIC, ...), including GIF/APNG/HEIC animation
  • WebP format, including animated WebP (use the SDWebImageWebPCoder project)
  • Support extendable coder plugins for new image formats like BPG, AVIF. And vector format like PDF, SVG. See all the list in Image coder plugin List

Additional modules and Ecosystem

In order to keep SDWebImage focused and limited to the core features, but also allow extensibility and custom behaviors, during the 5.0 refactoring we focused on modularizing the library. As such, we have moved/built new modules to SDWebImage org.


SwiftUI is an innovative UI framework written in Swift to build user interfaces across all Apple platforms.

We support SwiftUI by building a brand new framework called SDWebImageSwiftUI, which is built on top of SDWebImage core functions (caching, loading and animation).

The new framework introduce two View structs WebImage and AnimatedImage for SwiftUI world, ImageIndicator modifier for any View, ImageManager observable object for data source. Supports iOS 13+/macOS 10.15+/tvOS 13+/watchOS 6+ and Swift 5.1. Have a nice try and provide feedback!

Coders for additional image formats

Custom Caches

Custom Loaders

  • SDWebImagePhotosPlugin - plugin to support loading images from Photos (using Photos.framework)
  • SDWebImageLinkPlugin - plugin to support loading images from rich link url, as well as LPLinkView (using LinkPresentation.framework)

Integration with 3rd party libraries

Community driven popular libraries

  • FirebaseUI - Firebase Storage binding for query images, based on SDWebImage loader system
  • react-native-fast-image - React Native fast image component, based on SDWebImage Animated Image solution
  • flutter_image_compress - Flutter compresses image plugin, based on SDWebImage WebP coder plugin

Make our lives easier

You can use those directly, or create similar components of your own, by using the customizable architecture of SDWebImage.


  • iOS 8.0 or later
  • tvOS 9.0 or later
  • watchOS 2.0 or later
  • macOS 10.10 or later (10.15 for Catalyst)
  • Xcode 10.0 or later

Backwards compatibility

Getting Started

Who Uses It


  • If you need help, use Stack Overflow. (Tag 'sdwebimage')
  • If you'd like to ask a general question, use Stack Overflow.
  • If you found a bug, open an issue.
  • If you have a feature request, open an issue.
  • If you need IRC channel, use Gitter.


How To Use

  • Objective-C
#import <SDWebImage/SDWebImage.h>
[imageView sd_setImageWithURL:[NSURL URLWithString:@""]
             placeholderImage:[UIImage imageNamed:@"placeholder.png"]];
  • Swift
import SDWebImage

imageView.sd_setImage(with: URL(string: ""), placeholderImage: UIImage(named: "placeholder.png"))

Animated Images (GIF) support

In 5.0, we introduced a brand new mechanism for supporting animated images. This includes animated image loading, rendering, decoding, and also supports customizations (for advanced users).

This animated image solution is available for iOS/tvOS/macOS. The SDAnimatedImage is subclass of UIImage/NSImage, and SDAnimatedImageView is subclass of UIImageView/NSImageView, to make them compatible with the common frameworks APIs.

The SDAnimatedImageView supports the familiar image loading category methods, works like drop-in replacement for UIImageView/NSImageView.

Don't have UIView (like WatchKit or CALayer)? you can still use SDAnimatedPlayer the player engine for advanced playback and rendering.

See Animated Image for more detailed information.

  • Objective-C
SDAnimatedImageView *imageView = [SDAnimatedImageView new];
SDAnimatedImage *animatedImage = [SDAnimatedImage imageNamed:@"image.gif"];
imageView.image = animatedImage;
  • Swift
let imageView = SDAnimatedImageView()
let animatedImage = SDAnimatedImage(named: "image.gif")
imageView.image = animatedImage

FLAnimatedImage integration has its own dedicated repo

In order to clean up things and make our core project do less things, we decided that the FLAnimatedImage integration does not belong here. From 5.0, this will still be available, but under a dedicated repo SDWebImageFLPlugin.


There are four ways to use SDWebImage in your project:

  • using CocoaPods
  • using Carthage
  • using Swift Package Manager
  • manual install (build frameworks or embed Xcode Project)

Installation with CocoaPods

CocoaPods is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries in your projects. See the Get Started section for more details.


platform :ios, '8.0'
pod 'SDWebImage', '~> 5.0'
Swift and static framework

Swift project previously have to use use_frameworks! to make all Pods into dynamic framework to let CocoaPods works.

However, start with CocoaPods 1.5.0+ (with Xcode 9+), which supports to build both Objective-C && Swift code into static framework. You can use modular headers to use SDWebImage as static framework, without the need of use_frameworks!:

platform :ios, '8.0'
# Uncomment the next line when you want all Pods as static framework
# use_modular_headers!
pod 'SDWebImage', :modular_headers => true

See more on CocoaPods 1.5.0 — Swift Static Libraries

If not, you still need to add use_frameworks! to use SDWebImage as dynamic framework:

platform :ios, '8.0'
pod 'SDWebImage'


There are 2 subspecs available now: Core and MapKit (this means you can install only some of the SDWebImage modules. By default, you get just Core, so if you need MapKit, you need to specify it).

Podfile example:

pod 'SDWebImage/MapKit'

Installation with Carthage (iOS 8+)

Carthage is a lightweight dependency manager for Swift and Objective-C. It leverages CocoaTouch modules and is less invasive than CocoaPods.

To install with carthage, follow the instruction on Carthage

Carthage users can point to this repository and use whichever generated framework they'd like: SDWebImage, SDWebImageMapKit or both.

Make the following entry in your Cartfile: github "SDWebImage/SDWebImage" Then run carthage update If this is your first time using Carthage in the project, you'll need to go through some additional steps as explained over at Carthage.

NOTE: At this time, Carthage does not provide a way to build only specific repository subcomponents (or equivalent of CocoaPods's subspecs). All components and their dependencies will be built with the above command. However, you don't need to copy frameworks you aren't using into your project. For instance, if you aren't using SDWebImageMapKit, feel free to delete that framework from the Carthage Build directory after carthage update completes.

Installation with Swift Package Manager (Xcode 11+)

Swift Package Manager (SwiftPM) is a tool for managing the distribution of Swift code as well as C-family dependency. From Xcode 11, SwiftPM got natively integrated with Xcode.

SDWebImage support SwiftPM from version 5.1.0. To use SwiftPM, you should use Xcode 11 to open your project. Click File -> Swift Packages -> Add Package Dependency, enter SDWebImage repo's URL. Or you can login Xcode with your GitHub account and just type SDWebImage to search.

After select the package, you can choose the dependency type (tagged version, branch or commit). Then Xcode will setup all the stuff for you.

If you're a framework author and use SDWebImage as a dependency, update your Package.swift file:

let package = Package(
    // 5.1.0 ..< 6.0.0
    dependencies: [
        .package(url: "", from: "5.1.0")
    // ...

Manual Installation Guide

See more on Manual install Guide

Import headers in your source files

In the source files where you need to use the library, import the umbrella header file:

#import <SDWebImage/SDWebImage.h>

It's also recommend to use the module import syntax, available for CocoaPods(enable modular_headers)/Carthage/SwiftPM.

@import SDWebImage;

Build Project

At this point your workspace should build without error. If you are having problem, post to the Issue and the community can help you solve it.




Thank you to all the people who have already contributed to SDWebImage.



All source code is licensed under the MIT License.


To learn about SDWebImage's architecture design for contribution, read The Core of SDWebImage v5.6 Architecture. Thanks @looseyi for the post and translation.

High Level Diagram

Overall Class Diagram

Top Level API Diagram

Main Sequence Diagram

More detailed diagrams


  • Swift Tools 5.0.0


  • None
Last updated: Sat Aug 15 2020 14:56:37 GMT-0500 (GMT-05:00)