AVIF and iCloud Photos: What Happens When You Convert

If you're thinking about converting your iPhone library to AVIF, one question matters more than the rest: what happens to iCloud? Your photos sync to a Mac, an iPad, maybe a Windows PC. They show up in Memories. They appear in Photos albums on every device. If conversion breaks any of that, the storage savings aren't worth it.

The good news: AVIF works inside iCloud Photos with no special setup. This guide walks through exactly what happens, device by device, so you can convert confidently.

The Short Answer

When you convert an iPhone photo to AVIF and the AVIF file replaces the original in Photos, iCloud syncs the smaller AVIF to all your devices automatically. Your Mac, iPad, and any other Apple device sees the AVIF, opens it natively, and shows it in Photos as a normal photo. Memories, Faces, Places, and search all keep working.

What "iCloud Photos" Actually Does

iCloud Photos keeps your entire photo library in sync across every signed-in device. When you take a photo on iPhone:

1. The photo is saved to your Photos library.
2. iCloud Photos uploads it to Apple's servers.
3. Every device signed into the same iCloud account downloads it (or, in optimized mode, downloads a thumbnail and fetches the full photo on demand).

When you replace a photo (which is what happens during AVIF conversion):

1. The original goes to Recently Deleted locally.
2. The new AVIF version becomes the canonical photo.
3. iCloud syncs both changes — the move-to-Recently-Deleted and the new AVIF — to all your other devices.

On Your Mac

If your Mac is on a recent macOS version (modern Apple silicon Macs and Intel Macs running recent macOS):

• Photos app opens the AVIF natively. No conversion, no warning, no broken thumbnail.
• Memories and shared albums work normally.
• Editing tools (basic adjustments, filters, crop, markup) work on AVIF.
• Export to JPG still works if you need it for printing or non-Apple workflows.

On older macOS versions:

• Photos may show a thumbnail but struggle to open the full AVIF.
• The fix is to update macOS — every modern Mac can be updated to a version that supports AVIF natively.

On Your iPad

iPad runs the same iOS-family operating system as iPhone. AVIF support is identical: native open, Photos works normally, sync is automatic.

On Your Apple TV

AVIF support on Apple TV depends on the tvOS version. Recent tvOS releases handle AVIF in Photos and screensavers. Older Apple TV models may fall back to thumbnails for AVIF photos.

On Windows With iCloud for Windows

Apple's iCloud for Windows app downloads your iCloud Photos to a folder on your PC. Windows 11 opens AVIF natively. Windows 10 needs the free "AV1 Video Extension" from the Microsoft Store, which also handles AVIF photos.

What About iCloud Shared Albums?

When you add an AVIF photo to a shared album:

• Other participants on modern iPhones, iPads, or Macs see it natively.
• Participants on older devices may see a placeholder or auto-converted thumbnail.

If you regularly share albums with someone on older hardware, you can either export AVIF→JPG before adding to the shared album, or convert just your private library to AVIF and leave shared-album photos in their original format.

Will Conversion Re-Upload My Entire Library?

Sort of. After conversion:

• iCloud needs to upload the new (smaller) AVIF files.
• It needs to record that the originals moved to Recently Deleted.

The upload bandwidth used is less than the original library upload, because the AVIF files are smaller. Most users don't notice; the sync happens in the background, overnight if you're plugged in on Wi-Fi.

Will My iCloud Bill Drop?

Yes, on the next billing cycle after conversion and after the Recently Deleted album clears (or you empty it manually). Two things have to happen for the space to count:

1. The smaller AVIF files replace the originals in the active library.
2. The originals are permanently removed from Recently Deleted (auto after 30 days, or manually whenever).

After both, iCloud reflects the new (smaller) library size. If you cross a tier boundary (your library shrinks from, say, 75 GB to 45 GB), you can downgrade your iCloud plan.

Common Concerns

Will Photos lose any of my photos during conversion?

No. The original sits in Recently Deleted for 30 days as a safety net. If anything looks off (in practice, nothing does), the original is right there to restore.

What if iCloud is mid-sync when I start a conversion batch?

HEVCut works on photos as they exist on your device. iCloud syncs the changes when it's ready. There's no race condition; you can run conversions during sync and Photos handles the ordering.

Will my Memories and "On This Day" still work?

Yes. Memories operate on photo metadata (dates, locations, faces), not on file format. AVIF photos appear in Memories exactly like HEIC photos do.

Will Faces and People recognition still work?

Yes. Face recognition is based on the photo content, which is identical after conversion. Existing People albums keep their members.

What about Live Photos?

Live Photos have two parts: a still photo and a short video. AVIF replaces the still part. The video portion is unchanged. The Live Photo still plays in Photos with the long-press gesture.

What about Portrait mode photos?

Portrait depth data carries through. The photo still has the blur effect and you can still re-edit the depth.

What if I'm running low on iCloud space already?

Conversion can actually help you finish the upload. Smaller AVIF files take less iCloud space, so an over-quota library can fit again after conversion.

Will the recipients of my shared photos see them?

On modern Apple devices and modern Android: yes. On older non-Apple devices: maybe not directly — export to JPG before sharing in that case.

Bottom Line

AVIF and iCloud Photos play well together on every modern Apple device, plus modern Windows and Android. Conversion runs on iPhone, iCloud syncs the smaller files automatically, and every other device in your account sees the AVIF natively. Your iCloud bill drops in the next cycle once the originals clear Recently Deleted. With HEVCut, the whole process happens on your phone in the background, while iCloud quietly does the rest.