How to Reduce Photo Size on iPhone (4 Free Ways)
Shrink iPhone photos before sending or uploading: change camera settings, resize with Shortcuts, compress to a KB target in Safari, or share a link.
By PictureToLink Team · · 7 min read
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To reduce photo size on iPhone, you can lower the camera's default resolution and switch off ProRAW so new photos are smaller, build a Shortcuts automation that resizes existing photos, compress a photo to an exact size (such as 100 KB) in Safari, or upload it and send a link instead of the file. Which one is right depends on whether you want every future photo smaller or just need one picture under a limit right now. All four are free and need no extra app.
Why iPhone photos are so large
If you have ever been told a photo is "too large to upload", the cause is usually one of these three things.
High resolution
Recent iPhones have high-resolution main cameras. Apple's guide to advanced camera settings explains that on supported models you can choose a default of 12 MP or 24 MP for the Main camera, and that 48 MP capture is switched on with Resolution Control (or ProRAW & Resolution Control, depending on model). More megapixels mean more detail, and a bigger file.
HEIC or JPEG
By default, iPhones save photos in HEIF/HEIC, a format Apple says offers "better compression than JPEG" at the same visual quality. HEIC files are compact, but some websites and forms will not accept them. When you convert a HEIC photo to JPEG to get it accepted, the JPEG is often larger. Our explainer on what HEIC is covers the format in detail.
ProRAW
On models that support Apple ProRAW, those files are far bigger than normal photos. Apple's ProRAW guide puts a 12 MP ProRAW image at about 25 MB and a 48 MP one at about 75 MB. If ProRAW is switched on and you forget about it, your storage fills quickly and uploads fail.
Most upload limits that trip people up are much smaller than any of these: online forms often ask for 100 KB, 200 KB or 1 MB, and email providers cap attachments in the tens of megabytes. So the fix is usually a combination of fewer pixels and stronger compression.
Method 1: change your camera settings
This method makes every future photo smaller. It does not change the photos you already have.
Lower the default resolution
- Open Settings and tap Camera.
- Tap Formats, then Photo Mode.
- Choose 12 MP instead of 24 MP.
This option appears only on models that support it. If you previously turned on Resolution Control to take 48 MP photos, consider turning it off unless you need that detail.
Turn off ProRAW if you do not need it
In Settings > Camera > Formats, check whether ProRAW & Resolution Control is on. If you are not editing RAW files in a professional app, turning it off avoids the 25–75 MB files described above.
HEIC vs Most Compatible
In the same Formats screen, High Efficiency saves HEIF/HEIC and Most Compatible saves JPEG. High Efficiency gives smaller files; Most Compatible gives files that every website accepts. If you regularly upload to sites that reject HEIC, our guide on making your iPhone save photos as JPG walks through the trade-off.
Best for: stopping the problem at the source, especially if you are running out of storage.
Method 2: resize with Shortcuts
Apple's Shortcuts app can resize images. Its user guide describes "transform actions" that edit content (such as cropping an image) or convert content to a different format (such as changing a PNG to a JPEG). You can build a small shortcut once and reuse it from the Share button.
- Open the Shortcuts app and tap + to create a new shortcut.
- Tap Add Action, then use the search field to find Resize Image.
- Set the width, for example 1600. Leave height on automatic so the photo keeps its proportions.
- Add a Convert Image action and choose JPEG if the site you are uploading to does not accept HEIC.
- Add Save to Photo Album so the smaller copy lands in your library.
- Open the shortcut's Details and turn on Show in Share Sheet, as Apple describes in its guide to running a shortcut from another app. The shortcut then appears when you tap Share on a photo.
Now, in Photos, select a picture, tap Share, and run your shortcut. The original stays untouched, and a smaller copy is saved alongside it.
How much smaller? Resizing is by far the most effective step. On the test photos we measured with our own upload pipeline, simply resizing a 3024 × 2016 JPEG to 1920 px wide cut its size by 77.3%, a 4032 px wide landscape shrank by 78.4%, and a 5000 × 3333 night shot by 95.2%. Exact savings depend on the photo, but cutting the pixel count is what makes the big difference.
A quicker option on newer iOS: Preview
If your iPhone runs a recent version of iOS, Apple's user guide (in its iOS 26 and iOS 27 editions) describes a Preview app that can adjust an image's size: open the image in Preview, tap the More button, tap Adjust Size, choose the options and tap Done. It is handy for a one-off resize; the shortcut above is faster when you do it often.
Best for: people who regularly need smaller copies and want them in their photo library.
Method 3: compress to a target size in Safari
When a form asks for a photo "under 100 KB" or "under 50 KB", resizing alone is guesswork. A browser-based compressor can aim at the number for you.
- Open Safari and go to our image compressor.
- Tap to choose a photo from your library.
- Pick JPG as the output format (the safest choice for forms).
- Under Target size, choose the limit you need: under 20, 50, 100, 200 or 500 KB.
- Download the result and upload it to the form. Apple explains where to find downloads: the Downloads folder in the Files app.
The compressor runs inside your browser, so the photo is not uploaded to us. If even the lowest reasonable quality is too big for the target, it reduces the dimensions too, and tells you when it has done so.
If you know the exact KB figure you need, the reduce image size in KB tool is set up for that job.
Best for: application forms, ID uploads and any site with a strict KB limit.
Method 4: upload and send a link
Sometimes the question is really "how do I send this big photo?" If the person only needs to see the picture, you can skip the attachment and send a link.
- Open PictureToLink in Safari.
- Tap to choose one or more photos (up to 20 at a time).
- Photos are kept at up to 1920 px (Full HD) by default. Optionally pick a smaller size, Medium (1280 px) or Small (800 px), under the options.
- Copy the link and paste it into your message, email or chat.
Every upload is compressed and has its metadata removed, including GPS location. Photos larger than 1920 px are scaled down to that size. On our three sample phone photos, the default "Balanced" setting saved 62.4–78.4%.
Be aware of the limits: we accept JPG, PNG, WebP, GIF and AVIF up to 25 MB, but not HEIC. If your iPhone saves HEIC, either switch to Most Compatible (Method 1) or convert the photo to JPEG first with the Shortcuts method above. Anyone with the link can view the photo, so do not use this for private pictures. Images are removed after 12 months without views, or sooner if you pick an auto-delete time.
Best for: sharing a photo with people when attachment limits get in the way.
Which method to use
| Your situation | Best method |
|---|---|
| Storage is filling up, or every photo is too big | Method 1: camera settings |
| You often need smaller copies saved in Photos | Method 2: Shortcuts |
| A form demands a photo under a specific KB size | Method 3: compress to a target in Safari |
| You just want someone to see the photo | Method 4: send a link |
A few tips that apply to every method:
- Resize before you compress. Halving the width and height leaves a quarter of the pixels, which usually saves more than any quality slider.
- Work on a copy. Keep your full-size original in case you need it later.
- Check the required format. Many forms want JPG. If yours says "JPG or PNG", choose JPG for photos, as it is much smaller for photographic images.
- Watch for location data. iPhone photos can include where they were taken. Strip it before posting publicly.
For a broader look at shrinking images on any device, see our guide to reducing image file size without losing quality.
Next step
If you need one photo under a size limit right now, open the image compressor in Safari and choose your target size. If you want the problem gone for good, start with Method 1 and check your camera settings today.