A WebP coder plugin for SDWebImage, use libwebp

What's New

0.6.1 - Fix Progressive Thread Safe && Max Pixel Size



  • Fix the potential buffer crash issue during progressive animated webp decoding, and avoid extra copy for partial image data #41


  • Feature WebP Encoding max pixel size (Thumbnail Encoding) #42


CI Status Version License Platform SwiftPM compatible Carthage compatible codecov

Starting with the SDWebImage 5.0 version, we moved the WebP support code and libwebp from the Core Repo to this stand-alone repo.

SDWebImageWebPCoder supports both WebP decoding and encoding, for Static WebP or Animated WebP as well.


  • iOS 8
  • macOS 10.10
  • tvOS 9.0
  • watchOS 2.0



SDWebImageWebPCoder is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SDWebImageWebPCoder'


SDWebImageWebPCoder is available through Carthage.

github "SDWebImage/SDWebImageWebPCoder"

Swift Package Manager (Xcode 11+)

SDWebImageWebPCoder is available through Swift Package Manager.

let package = Package(
    dependencies: [
        .package(url: "", from: "0.3.0")


Add Coder

Before using SDWebImage to load WebP images, you need to register the WebP Coder to your coders manager. This step is recommended to be done after your App launch (like AppDelegate method).

  • Objective-C
// Add coder
SDImageWebPCoder *webPCoder = [SDImageWebPCoder sharedCoder];
[[SDImageCodersManager sharedManager] addCoder:webPCoder];
  • Swift
// Add coder
let WebPCoder = SDImageWebPCoder.shared

Modify HTTP Accept Header

Some of image server provider may try to detect the client supported format, by default, SDWebImage use image/*,*/*;q=0.8 for Accept. You can modify it with the image/webp as well.

  • Objective-C
[[SDWebImageDownloader sharedDownloader] setValue:@"image/webp,image/*,*/*;q=0.8" forHTTPHeaderField:@"Accept"];
  • Swift
SDWebImageDownloader.shared.setValue("image/webp,image/*,*/*;q=0.8", forHTTPHeaderField:"Accept")


  • Objective-C
// WebP online image loading
UIImageView *imageView;
[imageView sd_setImageWithURL:webpURL];
  • Swift
// WebP online image loading
let webpURL: URL
let imageView: UIImageView
imageView.sd_setImage(with: webpURL)

Progressive Animation Loading (0.5.0+)

  • Objective-C
// WebP progressive loading for animated image
SDAnimatedImageView *imageView;
imageView.shouldIncrementalLoad = YES;
[imageView sd_setImageWithURL:webpURL placeholderImage:nil options:SDWebImageProgressiveLoad];
  • Swift
// WebP progressive loading for animated image
let webpURL: URL
let imageView: SDAnimatedImageView
imageView.shouldIncrementalLoad = true
imageView.sd_setImage(with: webpURL, placeholderImage: nil, options: [.progressiveLoad])


  • Objective-C
// WebP image decoding
NSData *webpData;
UIImage *image = [[SDImageWebPCoder sharedCoder] decodedImageWithData:webpData options:nil];
  • Swift
// WebP image decoding
let webpData: Data
let image = SDImageWebPCoder.shared.decodedImage(with: data, options: nil)

Thumbnail Decoding (0.4.0+)

  • Objective-C
// WebP thumbnail image decoding
NSData *webpData;
CGSize thumbnailSize = CGSizeMake(300, 300);
UIImage *thumbnailImage = [[SDImageWebPCoder sharedCoder] decodedImageWithData:webpData options:@{SDImageCoderDecodeThumbnailPixelSize : @(thumbnailSize}];
  • Swift
// WebP thumbnail image decoding
let webpData: Data
let thumbnailSize = CGSize(width: 300, height: 300)
let image = SDImageWebPCoder.shared.decodedImage(with: data, options: [.decodeThumbnailPixelSize: thumbnailSize])


  • Objective-c
// WebP image encoding
UIImage *image;
NSData *webpData = [[SDImageWebPCoder sharedCoder] encodedDataWithImage:image format:SDImageFormatWebP options:nil];
// Encode Quality
NSData *lossyWebpData = [[SDImageWebPCoder sharedCoder] encodedDataWithImage:image format:SDImageFormatWebP options:@{SDImageCoderEncodeCompressionQuality : @(0.1)}]; // [0, 1] compression quality
NSData *limitedWebpData = [[SDImageWebPCoder sharedCoder] encodedDataWithImage:image format:SDImageFormatWebP options:@{SDImageCoderEncodeMaxFileSize : @(1024 * 10)}]; // v0.6.0 feature, limit output file size <= 10KB
NSData *thumbnailWebpData = [[SDImageWebPCoder sharedCoder] encodedDataWithImage:image format:SDImageFormatWebP options:@{SDImageCoderEncodeMaxPixelSize : @(CGSizeMake(200, 200)}]; // v0.6.1 feature, encoding max pixel size
  • Swift
// WebP image encoding
let image: UIImage
let webpData = SDImageWebPCoder.shared.encodedData(with: image, format: .webP, options: nil)
let lossyWebpData = SDImageWebPCoder.shared.encodedData(with: image, format: .webP, options: [.encodeCompressionQuality: 0.1]) // [0, 1] compression quality
let limitedWebpData = SDImageWebPCoder.shared.encodedData(with: image, format: .webP, options: [.encodeMaxFileSize: 1024 * 10]) // v0.6.0 feature, limit output file size <= 10KB
let thumbnailWebpData = SDImageWebPCoder.shared.encodedData(with: image, format: .webP, options: [.encodeMaxPixelSize: CGSize(width: 200, height: 200)]) // v0.6.1 feature, encoding max pixel size

See more documentation in SDWebImage Wiki - Coders


To run the example project, clone the repo, and run pod install from the root directory first. Then open SDWebImageWebPCoder.xcworkspace.

This is a demo to show how to use WebP and animated WebP images via SDWebImageWebPCoderExample target.


These WebP images are from WebP Gallery and GIF vs APNG vs WebP


Bogdan Poplauschi DreamPiggy


SDWebImageWebPCoder is available under the MIT license. See the LICENSE file for more info.


  • Swift Tools 5.0.0


Last updated: Mon Jan 11 2021 02:58:00 GMT-0500 (GMT-05:00)