How to Resize a Photo on iPhone (3 Easy Methods)

Your iPhone takes 12MP or 48MP photos — 4032x3024 or 8064x6048 pixels. That is excellent for printing and editing, but far too large for email attachments, web uploads, and form submissions that want "under 1MB" or "maximum 1200px wide."

The problem: the iPhone Photos app can crop but cannot resize. There is no built-in way to change pixel dimensions. You can trim the edges, but the remaining image stays at full resolution.

Here are three methods that actually work, starting with the fastest.

Method 1: Resize in Safari with Pixotter (No App Needed)

Pixotter's resize tool runs directly in mobile Safari. No app to install, no account to create, and your photos never leave your device — all processing happens on your iPhone.

1. Open Safari and go to pixotter.com/resize/.
2. Tap the drop zone and select your photo from the Photos library.
3. Enter your target dimensions — width and height in pixels. Lock the aspect ratio to avoid stretching.
4. Tap Process.
5. Tap Download to save the resized image to your Photos library.

The whole process takes about 10 seconds. Because everything runs client-side via WebAssembly, there is no upload wait and no server involved.

When to use this: You need specific pixel dimensions (1200x628 for Open Graph, 1080x1080 for Instagram, 800x600 for email). You need to resize and compress in one step. You do not want to install anything.

Method 2: Use the Shortcuts App (Built-In, Free)

The Shortcuts app has been included on every iPhone since iOS 13. You can build a one-tap shortcut that resizes any photo to your preferred dimensions.

Create the shortcut

1. Open the Shortcuts app (pre-installed — search for it if you cannot find it).
2. Tap the + button to create a new shortcut.
3. Tap Add Action, then search for Resize Image.
4. Tap the Resize Image action. Set the width to your target (e.g., 1200). Leave height set to Auto to preserve the aspect ratio.
5. Add a second action: search for Save to Photo Album and add it.
6. Tap the shortcut name at the top and rename it (e.g., "Resize to 1200px").
7. Tap Done.

Use the shortcut

1. Open Photos and select the image you want to resize.
2. Tap the Share button (square with an arrow).
3. Scroll down and tap your shortcut name.
4. The resized photo is saved to your Camera Roll automatically.

Pros: No third-party app or website required. Once created, the shortcut works from the Share sheet in any app.

Cons: You must create a separate shortcut for each target size. No preview before saving. No batch processing without a more advanced shortcut.

Method 3: Third-Party Apps (Image Size)

If you prefer a dedicated app, Image Size (by Vitalij Schaefer) is free and works on iOS 16 and later.

1. Download Image Size from the App Store.
2. Open the app and tap the photo icon to select an image from your library.
3. Enter your target width or height. The app recalculates the other dimension to maintain the aspect ratio.
4. Tap the download icon to save the resized photo.

Image Size also shows the file size before and after resizing, which is useful when you need to hit a specific file size limit.

Other options: Photo & Picture Resizer (free, ad-supported), Resize Image (free). All work similarly — load a photo, enter dimensions, save. The tradeoff is installing and maintaining another app.

Methods Comparison

For most people, Pixotter in Safari is the fastest path — no setup, no app, exact dimensions, and you can compress the file size in the same step.

Common iPhone Photo Sizes

Modern iPhones capture significantly more pixels than most destinations need. Here are the default capture sizes and common resize targets:

Default iPhone capture dimensions

Note: iPhones shoot in 4:3 aspect ratio by default. The 48MP sensor outputs 8064x6048 at full resolution, though iOS often saves a 12MP (4032x3024) version unless you enable 48MP capture in Settings > Camera > Formats > Photo Resolution.

Common resize targets

For a full breakdown of image dimensions across platforms, see our image resize guide.

How to Check Photo Dimensions on iPhone

Before resizing, you may want to know the current pixel dimensions. The Photos app does not show this by default, but there are two ways to find it.

Method A: Swipe up on the photo (iOS 15+)

1. Open the photo in Photos.
2. Swipe up on the image (or tap the info button — the "i" in a circle).
3. Under the camera details, you will see the dimensions (e.g., 4032x3024) and file size.

This works for JPEG, HEIC, and PNG images. If you do not see dimensions, the photo may have been received via messaging (which strips metadata).

Method B: Use the Files app

1. Save the photo to Files (Share > Save to Files).
2. Open Files and find the image.
3. Long-press the file and tap Get Info.
4. The info panel shows dimensions, file size, format, and creation date.

FAQ

Does the iPhone Photos app have a resize option? No. The Photos app supports cropping (removing edges), rotation, and filters — but not resizing to specific pixel dimensions. Cropping changes the frame but keeps the resolution of the remaining area. To actually change pixel dimensions, use one of the three methods above.

Will resizing a photo reduce the file size? Yes. A 48MP photo (8064x6048) might be 5–10MB. Resizing to 1200x900 typically brings it under 500KB. Smaller pixel dimensions mean fewer pixels to store, which directly reduces file size. For more control over file size, see our guide on how to reduce image size.

Can I resize multiple photos at once on iPhone? The Shortcuts app can process multiple photos with a modified shortcut, but it is finicky. Pixotter's resize tool supports batch processing — select multiple photos, set your target dimensions, and download them all as a ZIP.

Does resizing reduce photo quality? Resizing down (making smaller) removes pixels, so you lose some detail. For web and social media use, the difference is invisible. Resizing up (making larger) interpolates new pixels and usually looks soft or blurry — avoid enlarging beyond the original dimensions. For more on maintaining quality, see how to resize without losing quality.

What is the difference between cropping and resizing? Cropping cuts away the edges of an image — the remaining area stays at its original resolution. Resizing changes the pixel dimensions of the entire image without removing any part of the frame. You might crop to improve composition, and resize to meet a size requirement. Our iPhone crop guide covers the cropping side.

What format should I save the resized photo in? JPEG works for most situations — photos, social media, email. Use PNG if you need transparency or are working with screenshots and graphics. WebP is 25–35% smaller than JPEG at the same quality, but not all platforms accept it yet. Pixotter lets you convert formats during the resize step.

Can I resize a photo for a passport application on iPhone? Yes. Most passport and visa applications require a 2x2 inch photo at 300 DPI — that translates to 600x600 pixels. Use Pixotter's resize tool to set exactly 600x600 and save as JPEG.

How do I resize a photo to under 100KB on iPhone? Resizing alone may not hit a specific file size target. You'll need to combine resizing (smaller dimensions) with compression (lower JPEG quality). Pixotter does both in one step — resize to smaller dimensions and compress to your target file size. See also our guide to compressing images to 100KB.