Transfer files from iCloud Drive to Google Drive

Server to server, without downloading anything to your computer.

How it works

Connect both accounts once. ShiftMyData then talks to iCloud Drive and Google Drive directly and streams the files between them in memory — nothing is written to our disks, and nothing travels down to your machine and back up again. The job runs on a worker, so closing the tab does not stop it.

Will every file be verified?

iCloud Drive exposes no checksum through its API, so files are compared on size and modification time. That is a limit of iCloud Drive rather than of the transfer, and it applies whichever tool you use.

Before you start

The largest single file Google Drive accepts is 5 TB. A bigger one is reported as failed and the rest of the transfer carries on.
Google Drive accepts at most 750 GB of uploads per user per day. A 2 TB move into it takes at least 3 days however fast both sides are, so plan a large one as a daily schedule rather than a single run.
A transfer copies each file's current content, name and modification time; sharing and version history stay behind on iCloud Drive. Business migration carries them where both sides support them.

Sources: support.google.com · rclone.org

Worth knowing about iCloud Drive

Apple publishes no official API for iCloud Drive. The connection uses an unofficial one, signed in with your Apple ID password and a code Apple shows on your device, and Apple can change it without notice -- so treat iCloud as best-effort rather than as something to schedule a nightly job against.

Worth knowing about Google Drive

Google Docs, Sheets and Slides are not files in the ordinary sense -- they have no bytes to copy and no size until they are exported. ShiftMyData exports them to their Office equivalents on the way out; a native Doc cannot be preserved as a Doc anywhere except another Drive.

Steps

On the Clouds screen, add iCloud Drive: enter your Apple ID and password, then the code Apple shows on one of your devices.
Add Google Drive the same way: sign in with Google and allow access.
Pick the source folder in the left pane and the destination folder in the right.
Choose a mode — copy, mirror, move, or two-way — and start the transfer.
Leave it. Progress is on the Jobs screen, and a webhook can tell you when it ends.

Questions

Do I have to download my files from iCloud Drive first?

No. The transfer is streamed from iCloud Drive to Google Drive on our servers, so nothing is written to your machine and your home upload speed is not the limit.

What happens if I close my laptop?

The job keeps running. It is queued on a worker rather than in your browser, and the progress is there when you come back.

How do I know every file arrived?

Is there a size limit?

None imposed by us. What you move is drawn from your prepaid allowance (30 GB free, then 500 GB for ₹100 or 2,500 GB for ₹500, each valid a year). Google Drive takes single files up to 5 TB, and its own storage quota applies.

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