DB Labs
The Fastest Ways to Reduce iPhone Photo File Sizes
The single most impactful change is making sure your iPhone shoots in HEIC format rather than JPEG — this alone cuts file sizes roughly in half with no visible quality difference. The second-biggest win is turning off Apple ProRAW if you have an iPhone 15 Pro or 16 Pro model. Together, these two settings changes can reduce photo storage use by 50–65% going forward. For photos you've already taken, iCloud's Optimize Storage feature replaces on-device copies with smaller previews.
Why iPhone Photos Are So Large
The camera hardware is the main culprit. Starting with iPhone 15 Pro and continuing through iPhone 16, Apple's main camera shoots at a true 48-megapixel resolution. That's four times as many pixels as the 12MP camera used in older iPhones, and roughly twice as many as most competing Android flagships. More pixels means more data per photo — it's unavoidable physics.
The format compounds this. An uncompressed 48MP photo would be enormous — well over 100MB. Camera formats apply various levels of compression to make files manageable while preserving quality:
- ProRAW — minimal compression, preserves all sensor data for editing. Result: 70–80MB per photo. Used by professional photographers and editors.
- JPEG — aggressive but lossy compression. Files are 45–55MB. Compatible with everything but significantly larger than HEIC for equal quality.
- HEIC — modern, efficient compression. Files are 25–30MB with quality equal or better than JPEG. The right choice for most people.
On top of format, several camera features add size: Live Photos embed a short video clip (3–4MB extra), Portrait mode saves a depth map alongside the photo, and Burst mode captures 10 frames per second, generating hundreds of files in seconds.
Photo Format Comparison: File Size vs. Quality vs. Compatibility
| Format | File Size (48MP) | Visual Quality | Edit Headroom | Compatibility |
|---|---|---|---|---|
| HEIC (default) | 25–30 MB | Excellent | Good | Modern devices & services |
| JPEG / Most Compatible | 45–55 MB | Excellent | Good | Universal |
| Apple ProRAW | 70–80 MB | Maximum | Maximum | Mac, iPad, pro apps only |
| JPEG (shared via Mail) | 1–4 MB | Reduced | Low | Universal |
6 Ways to Reduce Photo File Size on iPhone
1 Switch to HEIC Format SAVES 40–50%
Path: Settings → Camera → Formats → High Efficiency
HEIC is the default on modern iPhones, but it gets switched off if someone set your phone to "Most Compatible" — often done to fix sharing issues with a specific app or device. If your phone is currently in Most Compatible mode, switching back to High Efficiency cuts photo file sizes roughly in half.
What changes: Every new photo will be captured as HEIC. Existing photos are not converted — only future shots are affected.
What doesn't change: When you share a photo via AirDrop to a Mac, or attach it to an email, iOS can automatically convert HEIC to JPEG on the fly. You keep the storage benefit without sacrificing compatibility when sharing.
Who should do this: Everyone. There is almost no reason to stay in Most Compatible mode on a modern iPhone.
2 Turn Off Apple ProRAW SAVES 60–65%
Path: Settings → Camera → Formats → Apple ProRAW (toggle off)
ProRAW is only available on iPhone 15 Pro, 15 Pro Max, 16 Pro, and 16 Pro Max. It captures uncompressed sensor data for maximum editing flexibility — useful for professional photographers using apps like Darkroom, Lightroom Mobile, or Halide.
If you're not actively editing RAW photos on your iPhone or Mac, ProRAW is pure overhead. A ProRAW photo is 70–80MB versus 25–30MB for the same shot in HEIC. That's a 60–65% file size reduction just by toggling one setting.
Who should keep ProRAW on: Photographers who process every photo they take and need maximum shadow recovery, highlight recovery, or color grading flexibility. If you mostly shoot and browse without heavy editing, turn it off.
3 Lower Camera Resolution or Video Quality SAVES VARIES
Path: Settings → Camera → Record Video (for video resolution)
For video, the resolution setting has an enormous impact on file size. Dropping from 4K 60fps (~800MB/min) to 1080p 60fps (~200MB/min) saves 75% of video storage for comparable smoothness. For casual video, 1080p 60fps is visually excellent and quarter the size.
For photos, you cannot set a "lower resolution" mode on iPhone 15 Pro or 16 — the camera always shoots full 48MP in Photo mode. However, shooting in Portrait or Night mode results in 12MP output (smaller files), as does using the 5x telephoto lens.
4 Turn Off Live Photos by Default SAVES 10–15%
To toggle off in Camera: Tap the concentric rings icon at the top of the Camera app to disable Live Photos for the current session.
To make it permanent: Settings → Camera → Preserve Settings → toggle on "Live Photo" (this makes the Camera app remember your OFF preference between sessions).
Every Live Photo includes a short 1.5-second video clip before and after the still, adding 3–4MB per photo. Across 1,000 photos, that's 3–4GB of short clips most people never watch. Live Photos are a charming feature, but if storage is tight, disabling them by default is an easy win — you can still enable Live Photos for individual special moments.
5 Use iCloud Optimize Storage FREES ON-DEVICE SPACE
Path: Settings → [Your Name] → iCloud → Photos → Optimize iPhone Storage
This setting doesn't delete your photos or compress them permanently. Instead, it keeps your full-resolution originals in iCloud and replaces them on-device with smaller preview versions — just large enough to look good on screen. When you tap a photo to view it full screen, iOS downloads the full resolution in the background.
The result: your camera roll can contain tens of thousands of photos while only using a fraction of the on-device storage. The actual on-device size of each optimized photo is typically 1–3MB regardless of the original resolution, compared to 25–30MB for a full HEIC file.
Requirement: You need enough iCloud storage to hold your entire photo library. The free 5GB tier fills quickly — most people need the 50GB ($0.99/month) or 200GB ($2.99/month) plan. Learn more about how iPhone photos backup to iCloud automatically.
6 Compress Photos When Sharing FOR SHARING ONLY
When you send a photo via the iOS Mail app, Apple gives you a size picker. Tap the photo attachment in Mail, then tap the size options that appear below the compose window: Small (~100KB), Medium (~400KB), Large (~1MB), Actual Size (full resolution). Choose the smallest that still looks acceptable for your use case.
For sharing via iMessage, iOS compresses photos automatically to around 1–2MB per image — you don't need to do anything.
For sharing via other apps (WhatsApp, email clients, Slack), the compression behavior depends on the app. WhatsApp compresses aggressively by default. Slack lets you share the original or choose quality. Check the specific app's settings if file size matters for your workflow.
What this doesn't do: Sharing a compressed copy doesn't reduce the size of the original stored on your device. The original stays at full resolution. This is purely a "reduce size for transmission" feature, not a storage management tool.
What You Cannot Do Without Third-Party Apps
There are a few common requests that iOS does not natively support:
- You cannot batch-resize existing photos to a smaller pixel dimension. The built-in Photos app has no export or resize function. To resize photos to, say, 2000px wide, you need a third-party app.
- You cannot recompress existing photos to HEIC after they've been saved as JPEG. Switching to HEIC format in Settings only affects new photos — old JPEG files stay as JPEG unless you use a conversion app.
- You cannot change video encoding for videos already recorded. Past videos stay at their original quality. Only future recordings use the resolution setting you change.
When File Size Isn't the Real Problem
Sometimes the issue isn't that individual photos are too large — it's that you simply have too many of them. Reducing from 50MB to 25MB per photo doesn't help much if you have 15,000 photos instead of 5,000 photos. In that case, what you actually need is to cull your library.
Most people's camera rolls include significant numbers of near-duplicate shots (5 takes of the same selfie, 3 burst shots of the same moment), blurry or dark shots from testing the camera, screenshots accumulated over years, and meme images saved from social media. None of these benefit from format optimization — they just need to be deleted.
See our guide on iPhone 16 storage tips for a broader approach to managing your camera roll over time.
Delete the Redundant Shots Faster
Switching to HEIC halves your photo file sizes going forward. But what about the backlog? Swype Photo Cleaner lets you review your camera roll one photo at a time — swipe left to delete the blurry ones, duplicates, and misfires, swipe right to keep the keepers. It's the fastest way to cull thousands of photos without missing anything worth keeping.
Free · iPhone · iOS 16+ · 100% on-device, no uploads
Free · iPhone · iOS 16+
More related reading: how iPhone photos backup automatically, Swype Photo Cleaner full overview, and our iPhone 16 storage tips.