iPhone 的照片(Photos)应用程序不仅仅是一个照片管理器。它也是一个相当强大的图像编辑器。但是，令人难以置信的是，它不允许您调整照片的大小。
如果您想调整 iPhone 上的图片大小，可能是为了减小文件大小或满足特定的在线上传要求，您必须改用快捷方式或第三方图片调整应用程序。
使用快捷方式
iPhone 上的Shortcuts应用程序是一个了不起的工具，它可以自动执行各种任务，甚至是原生应用程序中不存在的任务。(Shortcuts)您可以使用它来构建具有(build a custom shortcut)调整图像大小功能的自定义快捷方式，或者您可以切入正题并获取第三方快捷方式。
构建自定义图像大小调整快捷方式(Build Custom Image Resizing Shortcut)
如果您有几分钟的空闲时间，您可以创建一个自定义快捷方式，然后帮助您同时调整一张或多张照片的大小。以下步骤将引导您完成整个过程。
1.在 iPhone 上打开快捷方式应用程序。(Shortcuts )
2. 切换到我的快捷方式(My Shortcuts)选项卡。
3. 点击屏幕右上角的+
4. 点击屏幕底部的“搜索应用程序和操作”字段，然后按出现的顺序添加以下操作。(Search for apps and actions)
- 选择照片(Select Photos)
- 调整图像大小(Resize Image)
- 保存到相册(Save to Photo Album)
5. 对您刚刚添加的每个操作进行以下调整。
选择照片：展开操作并打开(Select Photos:)多(Multiple )张旁边的滑块（如果您只想一次调整一张照片的大小，请保持关闭）。
调整图像大小：(Resize image:)将默认的640替换为您想要的图像宽度 - 该操作将保留比例并自动调整高度。或者，如果您希望在每次运行快捷方式时设置所需的宽度，请选择每次询问。(Ask Each Time )
保存到相册：(Save to Photo Album:)点击最近(Recents )并选择一个相册以保存调整大小的图像。如果您希望快捷方式将图片直接保存到相机胶卷，则可以保持原样。
6. 点击屏幕右上角的下一步。(Next )
7. 为快捷方式添加一个名称（例如Resize Images）并选择Done。
您已完成创建快捷方式。您可以在快捷方式(Shortcuts)应用程序的“我(My Shortcuts )的快捷方式”选项卡下方找到它。点击它，快捷方式会提示您选择要调整大小的图像。进行选择并点击添加(Add)。
然后，输入一个宽度（如果您将其设置为每次都询问宽度）并点击完成(Done )以调整图片大小。您应该在构建快捷方式时指定的相册中找到修改后的图片。
使用第三方图像大小调整快捷方式(Use Third-party Image Resizing Shortcut)
您可以下载并使用第三方替代方法，例如Resize Image或Bulk Resize ，而不是创建自己的快捷方式来调整 iPhone 上的图片大小。默认情况下，您的 iPhone 不支持外部快捷方式，因此您必须先前往“设置”(Settings ) > “快捷方式”并打开“(Shortcuts )允许不受信任的快捷方式(Allow Untrusted Shortcuts)”旁边的开关，然后才能将它们添加到 iPhone。
警告：(Warning:) 第三方(Third-party)快捷方式可能不安全。添加它们需要您自担风险！
调整图像大小(Resize Image)提供对整个图像大小调整过程的精细控制。您可以通过图像的共享表(Share Sheet)运行它，并从多个预设的调整大小选项中进行选择。或者，您可以指定自定义尺寸。完成调整大小后，您可以将图像保存到照片(Photos)应用程序、与其他应用程序共享或将其复制到剪贴板。
调整图像大小(Resize Image)不会将您限制在您的照片库中；它可以从任何位置（例如“文件”(Files)应用程序）调整 iPhone 上的图片大小。但是，快捷方式一次不能处理多个图像。
(Bulk Resize)另一方面，批量调整大小允许您调整多个图像的大小。通过快捷方式(Shortcuts)应用程序运行它，指定宽度，快捷方式会将调整大小的图像保存到您的照片库中。
第三方图像调整应用程序
除了快捷方式(Shortcuts)，您还可以使用Image Size、Batch Resize和Snapseed应用程序来调整 iPhone 图像的大小。这三个应用程序都可以免费使用。
图像大小(Size)允许您在照片库中添加和调整任何图像的大小。您可以以像素、毫米或英寸为单位快速指定屏幕顶部的宽度和高度。预览窗格实时显示图片的输出文件大小，如果这是一个问题，它会非常方便。
Image Size还附带了一些图像编辑工具，可让您为图像添加滤镜、效果、表情符号、文本等。
此外，您可以前往应用程序的设置(Settings)屏幕来配置它的工作方式。例如，您可以设置输出格式为HEIC 或 JPEG(HEIC or JPEG)，指定输出质量，保存后提示应用删除原始图像等。
顾名思义，Batch Resize是一个允许您批量处理图像的应用程序（由与Image Size相同的开发人员创建）。(Image Size)添加您的照片，指定您的尺寸，然后您就可以开始使用了。
然而，与Image Size不同，它并没有做任何花哨的事情。只需(Just)确保在开始之前访问其设置(Settings)屏幕以确定输出质量和格式。
Snapseed是来自(Snapseed)Google的一款出色的照片编辑工具。它可以让您通过快速添加滤镜、调整白平衡、调整曝光等来为图像增添趣味。(spice up images)它不允许您将图片大小调整为自定义尺寸，但它带有一组可能正是您需要的预设尺寸。
点击应用右上角的三点图标，然后选择(3-dot )设置(Settings)。然后，点击Image Sizing并在800px、1366px、1920px、2000px、4000px宽度选项之间进行选择。每当您导出图像时，它将使用指定的宽度，同时自动按比例调整高度。
放大它们
使用快捷方式或第三方图像大小调整应用程序，您可以方便地调整 iPhone 上任何图片的大小。如果您知道任何其他快速完成工作的方法，请在下面的评论中分享。
How to Resize Pictures on iPhone
Thе iPhone’s Photos apр іs not just a photо manager. It’s also а fairly robust image editor. Unbelievably, though, it does not allow yоu to resize photos.
If you want to resize pictures on your iPhone, perhaps to reduce its file size or to meet a specific upload requirement online, you must rely on shortcuts or third-party image resizing apps instead.
Use Shortcuts
The Shortcuts app on the iPhone is a phenomenal tool that can automate and execute various tasks, even those not present in native apps. You can use it to build a custom shortcut that sports the ability to resize images, or you can cut to the chase and grab a third-party shortcut instead.
Build Custom Image Resizing Shortcut
If you have a few minutes to spare, you can create a custom shortcut that will then help you resize one or more photos at the same time. The steps below will walk you through the entire process.
1. Open the Shortcuts app on your iPhone.
2. Switch to the My Shortcuts tab.
3. Tap the + icon to the top-right corner of the screen.
4. Tap the Search for apps and actions field to the bottom of the screen and add the actions below in the order they appear.
- Select Photos
- Resize Image
- Save to Photo Album
5. Make the following adjustments to each action that you just added.
Select Photos: Expand the action and turn on the slider next to Multiple (keep this turned off if you only want to resize a single photo at a time).
Resize image: Replace the default 640 with the image width you want—the action will preserve the ratio and automatically adjust the height. Or, select Ask Each Time if you prefer to set the desired width each time you run the shortcut.
Save to Photo Album: Tap Recents and select an album to save the resized images. You can leave it intact if you want the shortcut to save your pictures to the camera roll directly.
6. Tap Next to the top-right of the screen.
7. Add a name for the shortcut (such as Resize Images) and select Done.
You’ve finished creating the shortcut. You can find it listed underneath the Shortcuts app’s My Shortcuts tab. Tap it, and the shortcut should prompt you to pick the images you want to resize. Make your selections and tap Add.
Then, enter a width (if you set it to ask the width each time) and tap Done to resize the pictures. You should find the modified pictures in the album that you specified while building the shortcut.
Use Third-party Image Resizing Shortcut
Instead of creating your own shortcut to resize pictures on iPhone, you can download and use a third-party alternative such as Resize Image or Bulk Resize. By default, your iPhone does not support external shortcuts, so you must go to Settings > Shortcuts and turn on the switch next to Allow Untrusted Shortcuts before adding them to your iPhone.
Warning: Third-party shortcuts may not be safe. Add them at your own risk!
Resize Image offers granular control over the entire image resizing process. You can run it via the Share Sheet of an image and select from multiple pre-set resize options. Or, you can specify custom dimensions. Once you’ve finished resizing, you can save the image to the Photos app, share it with other apps, or copy it to your clipboard.
Resize Image doesn’t limit you to your photo library; it can resize pictures on your iPhone from any location, such as the Files app. However, the shortcut can’t process more than a single image at a time.
Bulk Resize, on the other hand, allows you to resize multiple images. Run it via the Shortcuts app, specify a width, and the shortcut will save the resized images to your photo library.
Third-party Image Resizing Apps
Shortcuts aside, you can use the Image Size, Batch Resize, and Snapseed apps to resize your iPhone images. All three apps are free to use.
Image Size allows you to add and resize any image within your photo library. You can quickly specify the width and height from the top of the screen in terms of pixels, millimeters, or inches. The preview pane shows the picture’s output file size in real-time, making it quite handy if that’s a concern.
Image Size also comes with a handful of image editing tools that allow you to add filters, effects, emoticons, text, etc., to your images.
Furthermore, you can head over to the app’s Settings screen to configure how it works. For example, you can set the output format as HEIC or JPEG, specify the output quality, prompt the app to delete the original image after saving it, etc.
As its name implies, Batch Resize is an app (created by the same developers as Image Size) that allows you to process images in batches. Add your photos, specify your dimensions, and you’re good to go.
Unlike Image Size, however, it doesn’t do anything fancy. Just make sure to visit its Settings screen to determine the output quality and format before you get started.
Snapseed is a fantastic photo editing tool from Google. It lets you spice up images by quickly adding filters, adjusting white balance, tweaking exposure, and more. It does not allow you to resize pictures to custom dimensions, but it comes with a set of pre-set sizes that may just be what you need.
Tap the 3-dot icon to the top-right corner of the app and select Settings. Then, tap Image Sizing and pick between the 800px, 1366px, 1920px, 2000px, 4000px width options. Whenever you export an image, it will use the specified width while automatically adjusting the height proportionately.
Size Them Up
With a shortcut or a third-party image resizing app at hand, you can conveniently resize any picture on your iPhone. If you know of any other quick methods to get the job done, share in the comments below.
