How to Reduce Pho­to File Size on iPhone and Mac

Parth Shah

Many sites have limitations for uploading images such as your photo or documents. Such a practice is in place for sites to handle a large database of photos without affecting the overall site performance. So if you're trying to upload a photo or photocopy of a document, you can reduce its file size right from your iPhone and Mac.

Reduce image size on i Phone and Mac

With better cameras, the file size of the photos and scans of the documents have also bumped of drastically. Those pictures are suitable for printing purposes. When it comes to sharing, you need to cut down on photo file size for a quick upload or transfer process. If you have transferred those photos from Android to iPhone or Mac and want to cut down on image size, then read along to find how to do it.

Reduce Photo's File Size on iPhone

There is no native way to reduce the photo file size on the iPhone. You can’t even see the photo file size from the default Photos app. You will have to save photos to the Apple Files app to view the size. Let’s look at the way to reduce image file size on the iPhone.

1. Change Camera Capture Format

The most common form of picture and video formats might be the reason why your camera pictures are taking up so much space. Apple introduced the new High-Efficiency Image Container (HEIC) format as an option over JPEG. HEIC offers high-quality images in a smaller size. Follow the steps below to change the camera capture format.

Step 1: Open the Settings app on the iPhone.

Step 2: Scroll down to the Camera section.

Step 3: Navigate to Formats and select High Efficiency from the following menu.

Camera menu on iphone
Change format in camera

That’s it. Now Apple will use HEIC format to shoot pictures that save space and reduce photo file size. However, these pictures still carry a couple of MBs of weight. To further reduce it, you will need to use a third-party app.

2. Use Image Size App

As the name suggests, the Image Size app allows you to resize an image to whatever size you like quickly and easily. You can specify the output format using one of the following four measurement units: pixels, millimeters, centimeters, and inches. Go through the steps below.

Step 1: Download the Image Size app from the link below.

Step 2: Open the app and permit it to access the library.

Step 3: Select the Photo from the Photos app.

Step 4: Select Pixel from the above menu and enter desired Width and Height to the photo.

Image size app
Image size reduced

Step 5: Use the bottom Save, Share, Email, or Print option to export the image.

We like how to app offers live data on reduced file size before you save the image.

3. Send Images to Yourself on WhatsApp or Telegram

Have you noticed how most social media file sizes are smaller than typical files? When you upload a picture on social media and re-download it, the size reduces drastically. You can apply this method to both photos and videos to reduce their size on your iPhone.

We have seen many users creating a WhatsApp group with only one member - Self.

Create whatsapp group

Open WhatsApp on your iPhone, create a group, and start sending photos to yourself. You can either save them from WhatsApp on iPhone or use the WhatsApp desktop app on Mac to download images at reducing size.

Reduce Photo's File Size on Mac

The process is less complicated on the Mac. The reason being the built-in way to reduce image file size on Mac. One can also change the image file type using the default Image Viewer app on Mac. Go through the steps below.

Step 1: Send photos from iPhone to Mac using AirDrop or opt for iCloud, Google Photos, or OneDrive.

Step 2: Open the image using the default Image preview on Mac.

Step 3: Go to File on the menu bar.

Step 4: Select Export from the following menu.

Export photo

Step 5: macOS will ask you to select the location and file type. Below the file type option, you will have a slider to reduce image size.

Reduce image size on mac

Step 6: Slide it down based on your requirements, and the OS will calculate the approximate file size for you.

Hit the Save button once you're done.

Compress Images on iPhone and Mac

You can go with Mac’s default method to reduce image size. It works flawlessly and requires no third-party app intervention to get things done.

Have you figured out another way to reduce file size? Share your preference in the comments section below.

Next up: Having problems with AirDrop not sending files from iPhone to Mac? Read the troubleshooting guide below to fix the issue.


The above article may contain affiliate links which help support Guiding Tech. However, it does not affect our editorial integrity. The content remains unbiased and authentic.

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Parth Shah

Written By

Parth Shah

Parth previously worked at EOTO.tech covering tech news. He is currently freelancing at Guiding Tech writing about apps comparison, tutorials, software tips and tricks and diving deep into iOS, Android, macOS, and Windows platforms.