Explainer2026-06-10

How Long Does It Take to Transfer iCloud Photos to Google Photos?

Realistic time estimates for moving your iCloud Photo Library to Google Photos, based on library size and internet speed.

The question everyone asks before starting a photo migration: how long is this actually going to take?

The honest answer is: it depends. But there are reliable ways to estimate, and things you can do to make the process faster.

The Main Factors

Library size. The more photos you have, the longer it takes. A 5,000-photo library and a 50,000-photo library are very different jobs.

File types. HEIC photos (modern iPhone format) are smaller than JPEGs. 4K videos are much larger than photos. A library that's heavy on video will take longer per gigabyte to upload.

Your internet connection. Upload speed is the main bottleneck. Australian home internet upload speeds are typically 10–50 Mbps, though many NBN connections are slower.

Whether photos are already on your Mac. If iCloud Photos has "Optimise Mac Storage" turned on, your Mac only stores low-res previews. The originals need to be downloaded from iCloud before they can be uploaded to Google Photos — adding a download step.

Time Estimates by Library Size

These are based on a typical Australian NBN connection with ~10–20 Mbps upload:

| Library Size | Approximate Time |

|--------------|-----------------|

| 1,000 photos (5GB) | 1–2 hours |

| 5,000 photos (25GB) | 4–8 hours |

| 10,000 photos (50GB) | 8–16 hours |

| 25,000 photos (125GB) | 20–40 hours |

| 50,000 photos (250GB) | 2–4 days |

| 100,000+ photos (500GB+) | 4–8 days |

These are rough estimates. A library with a lot of 4K video will be slower; a library of older JPEGs will be faster.

How to Check Your Library Size

On your iPhone: Settings → [your name] → iCloud → Photos → shows total storage used.

On your Mac: Open Photos → Photos menu → Settings → iCloud → shows library size.

On Google Photos (to check what you already have): photos.google.com → Storage.

How to Speed Up the Transfer

Use a wired ethernet connection. If your Mac has ethernet or you have a USB-C to ethernet adapter, a wired connection is significantly faster and more stable than WiFi for large uploads.

Run overnight. For large libraries, start the transfer before you go to bed and let it run overnight. Most of the work happens unattended.

Keep your Mac awake. Go to System Settings → Battery → Options → turn off "Enable Power Nap" and set "Prevent automatic sleeping" while the transfer is running. A sleeping Mac pauses the upload.

Don't run other heavy internet tasks. Large downloads or video streaming during the transfer will slow things down.

Use Migrate Moments on Mac rather than the Google Photos iOS app. The iOS app can only upload photos that are physically on your iPhone. For anything stored only in iCloud (not locally on the device), it either skips them or has to download then re-upload — which is slow and unreliable. Migrate Moments on Mac handles the entire pipeline: download from iCloud → upload to Google Photos.

What Happens If the Transfer Is Interrupted

Migrate Moments keeps a local database of every photo that's been successfully uploaded. If the transfer stops — your Mac sleeps, the internet drops, or you manually stop it — you can restart and it will pick up where it left off without re-uploading anything.

This is important for large libraries. You don't need to do it all in one session.

The Download Phase

If your photos aren't already on your Mac (common with "Optimise Mac Storage" turned on), there's a download phase before the upload. Migrate Moments handles this automatically — it downloads photos from iCloud in chunks, exports them, then uploads to Google Photos.

The download happens at your internet download speed (typically 50–100 Mbps on Australian NBN), so it's usually faster than the upload phase.