How to Compress a Photo on iPhone (Without Losing Quality)
Updated October 19, 2026.
The Photos app on iPhone has no one-tap compress button, but you still have good options. To send a smaller photo, attach it in Mail and choose a smaller image size. To make future photos smaller, keep Settings → Camera → Formats on High Efficiency so your iPhone saves HEIC files. To shrink photos already in your library without visible quality loss, use a photo compressor that re-encodes them on your device.
Below you will find each method step by step, how to tell which one fits, and how to keep quality high.
Watch the complete tutorial
Quick answer: which method should you use?
| Goal | Best method | Changes the photo in your library? |
|---|---|---|
| Email a smaller copy | Mail image size (Small, Medium, Large) | No |
| Send smaller photos in Messages | Low Quality Image Mode | No |
| Make new photos smaller | Camera format: High Efficiency (HEIC) | Only future photos |
| Shrink photos you already have | Photo compressor app (HEIC or AVIF) | Yes, after you confirm |
Method 1: Send a smaller photo from Mail
- Open Mail and start a new message.
- Add your photos from the photo picker.
- When iOS offers an image size (Small, Medium, Large, or Actual Size), pick a smaller one.
- Send the email.
This only shrinks the copy you send. The photo in your library stays the same size.
Method 2: Turn on Low Quality Image Mode in Messages
In Settings → Messages (under Settings → Apps on recent iOS versions), turn on Low Quality Image Mode. Images you send in Messages are sent at a lower quality, which helps on slow or limited data connections. Like the Mail method, it does not change the photos stored on your iPhone.
Method 3: Make future photos smaller with HEIC
Go to Settings → Camera → Formats and choose High Efficiency. Your iPhone then saves new photos as HEIC, which is usually much smaller than JPG at similar quality. If you have chosen Most Compatible, new photos are saved as larger JPG files.
If your iPhone offers higher-resolution photo options such as 48MP or ProRAW in Settings → Camera → Formats, keep them for shots you plan to edit or print large. Those files are much bigger than standard photos. Learn more in our HEIC vs JPG storage comparison.
Method 4: Compress photos already in your library
Settings only affect new photos. Years of older JPGs, screenshots saved as PNG, and high-resolution shots stay at full size until you re-encode them. The Shortcuts app includes Resize Image and Convert Image actions for one-off conversions, but for a whole library a dedicated compressor is faster and keeps your Photos metadata in place.
How to compress photos with HEVCut
- 01
Open HEVCut and tap Compress on the Home screen. Tap Sort and choose Most Savings to put the photos that can shrink the most at the top.
- 02
Tap Filters and choose Photos under Type. Narrow it further by date, category, or album, or tap individual photos to compress just those.
- 03
Tap Settings (the gear) and choose Photo Compression. Pick Gentle, Standard, High, or Max, choose HEIC or AVIF, and check the quality and resolution summary.
- 04
Tap Compress to queue the whole list. Encoding runs on your iPhone and nothing is uploaded.
- 05
Open a compressed photo and compare it with the original using the slider, then tap Keep Compressed or Revert.
HEVCut can save compressed photos as HEIC, the iPhone-native format, or AVIF for even smaller files. Date, location, camera details, favorites, and album membership are kept.
The presets also cap photo size: Gentle and Standard scale photos down to at most 3840 px on the long edge, High to 2560 px, and Max to 1080 px. At 3840 px, Gentle and Standard still keep more pixels than most phone and laptop screens show, but if you need every pixel of a 48 MP shot, use Fine-tune (HEVCut Pro), which can keep the original resolution.
Each compressed photo is saved as a new item next to the original, so you can compare them first. When you tap Keep Compressed, the original goes to Recently Deleted for 30 days and iCloud Photos syncs the smaller file. Revert deletes the compressed copy instead and keeps the original.
Live Photos are saved as still photos unless you turn on Keep Live Photo in Photo Compression (HEIC only). RAW photos are converted to HEIC or AVIF, so keep the RAW originals of shots you still plan to edit.
A large JPG of a few megabytes often re-encodes to well under half its size as HEIC or AVIF with no visible difference. Results vary with the photo: detailed scenes compress less than simple ones, and photos that are already efficient HEIC files save the least.
Understanding image compression
Compression comes in two flavors: lossless and lossy.
- Lossless compression reduces file size without removing any data. When you decode it, the result is identical to the original. Savings are modest because photo files are already efficient.
- Lossy compression removes detail that your eye is unlikely to notice, such as tiny variations in color and fine noise. Done well, the photo looks the same at normal viewing sizes while the file becomes much smaller.
Modern formats like HEIC and AVIF are better at lossy compression than JPG, which is why converting older JPGs gives the biggest savings.
Why iPhone photos are so big
Your iPhone captures as much data as it can so you can edit later:
- Color and dynamic range: modern iPhones capture wide color (P3) and HDR information.
- Metadata: photos include location, camera settings, and sometimes depth data for Portrait mode.
- Resolution: higher megapixel modes mean more pixels and larger files.
That is useful for editing, but most photos are only viewed and shared, so a well-compressed copy is usually all you need.
Frequently asked questions
Can you compress a photo on iPhone without an app?
Partly. The Photos app has no compress button, but Mail can send smaller image sizes, Messages has a Low Quality Image Mode for sending, and keeping Settings, Camera, Formats on High Efficiency saves new photos as smaller HEIC files. To shrink photos already in your library, you need a compression app or a shortcut.
How do I reduce the MB size of a photo on iPhone?
For a single photo you want to send, attach it in Mail and pick Small, Medium, or Large. To keep the photo in your library at a smaller size, re-encode it to an efficient format such as HEIC or AVIF with a photo compressor, which lowers the file size while the photo stays in your library.
Will compressed photos look blurry?
Not at sensible settings. Modern formats like HEIC and AVIF remove detail your eye is unlikely to notice at normal viewing sizes. Heavier settings can show softness in fine textures, so compare a few results at full size before compressing a large batch.
Does compressing photos on iPhone free up iCloud storage?
Yes, if the smaller version replaces the original in your library. iCloud Photos then syncs the smaller file to your other devices. Space is fully released once the originals leave Recently Deleted.
Can I get the original photo back after compressing?
With HEVCut, yes. The original stays in your library until you review the compressed copy: tap Revert to delete the copy and keep the original. After you tap Keep Compressed, the original moves to the Recently Deleted album in Photos for 30 days, so you can still restore it during that time. For a permanent archive, export the originals you care about before compressing.
Is HEIC smaller than JPG?
Usually, yes. HEIC typically stores a photo at similar visible quality in a noticeably smaller file than JPG, which is why it is the iPhone default when the camera format is set to High Efficiency.