How to get image file size in Swift?

Please check the google for 1 kb to bytes it will be 1000.

https://www.google.com/search?q=1+kb+%3D+how+many+bytes&oq=1+kb+%3D+how+many+bytes&aqs=chrome..69i57.8999j0j1&sourceid=chrome&ie=UTF-8

So while getting the proper size I’ve added multiple scenario by adding image in App Bundle and in photos in simulator.Well the image which I took from my Mac was of 299.0 KB.

Scenario 1: Adding image to Application Bundle

On adding image in your Xcode the size of the image will remain same in project directory. But you get it from its path the size will be reduced to 257.0 KB. Which is the actual size of the image used in the device or simulator.

    guard let aStrUrl = Bundle.main.path(forResource: "1", ofType: "png") else { return }   let aUrl = URL(fileURLWithPath: aStrUrl)   print("Img size = \((Double(aUrl.fileSize) / 1000.00).rounded()) KB")   extension URL {        var attributes: [FileAttributeKey : Any]? {            do {                return try FileManager.default.attributesOfItem(atPath: path)            } catch let error as NSError {                print("FileAttribute error: \(error)")            }            return nil        }        var fileSize: UInt64 {            return attributes?[.size] as? UInt64 ?? UInt64(0)        }        var fileSizeString: String {            return ByteCountFormatter.string(fromByteCount: Int64(fileSize), countStyle: .file)        }        var creationDate: Date? {            return attributes?[.creationDate] as? Date        }    }

Scenario 2: Adding image to Photos in Simulator

On adding image to photos in simulator or device the size of the image increased from 299.0 KB to 393.0 KB. Which is the actual size of the image stored in the device or simulator’s document directory.

Swift 4 and earlier

var image = info[UIImagePickerControllerOriginalImage] as! UIImagevar imgData: NSData = NSData(data: UIImageJPEGRepresentation((image), 1)) // var imgData: NSData = UIImagePNGRepresentation(image) // you can also replace UIImageJPEGRepresentation with UIImagePNGRepresentation.var imageSize: Int = imgData.countprint("size of image in KB: %f ", Double(imageSize) / 1000.0)

Swift 5

let image = info[UIImagePickerController.InfoKey.originalImage] as! UIImagelet imgData = NSData(data: image.jpegData(compressionQuality: 1)!)var imageSize: Int = imgData.countprint("actual size of image in KB: %f ", Double(imageSize) / 1000.0)   

By adding .rounded() it will give you 393.0 KB and without using it it will give 393.442 KB. So please check the image size manually once using the above code. As the size of image may vary in different devices and mac. I've check it only on mac mini and simulator iPhone XS.

extension UIImage {    public enum DataUnits: String {        case byte, kilobyte, megabyte, gigabyte    }    func getSizeIn(_ type: DataUnits)-> String {        guard let data = self.pngData() else {            return ""        }        var size: Double = 0.0        switch type {        case .byte:            size = Double(data.count)        case .kilobyte:            size = Double(data.count) / 1024        case .megabyte:            size = Double(data.count) / 1024 / 1024        case .gigabyte:            size = Double(data.count) / 1024 / 1024 / 1024        }        return String(format: "%.2f", size)    }}

Usage example : print("Image size \(yourImage.getSizeIn(.megabyte)) mb")

Swift 3/4:

if let imageData = UIImagePNGRepresentation(image) {     let bytes = imageData.count     let kB = Double(bytes) / 1000.0 // Note the difference     let KB = Double(bytes) / 1024.0 // Note the difference}

Please note the difference between kB and KB. Answering here because in my case we had an issue while we considered kilobyte as 1024 bytes but server side considered it as 1000 bytes which caused an issue. Link to learn more.

PS. Almost sure you'll go with kB (1000).