Backblaze B2 client for macOS
A Backblaze B2 Client for Mac - Inside a Real File Manager
Backblaze doesn't ship a Mac GUI for B2 - EmpiricCommander fills that gap. Browse your B2 buckets through the S3-compatible API in a native dual-pane window: B2 on one side, your Mac (or another cloud) on the other. Upload, download, batch rename, and verify transfers - on macOS, iPad, and iPhone.
$29.99 one-time · no subscription · macOS, iPad & iPhone
No CLI, no third-party sync tool
That's the whole setup
Opt-in folder compare verification
What you can do with B2 in EmpiricCommander
Browse buckets natively
Your B2 buckets appear as a pane in a real file manager - navigate, preview, Quick Look, and search like a local folder.
Dual-pane transfers
B2 in one pane, local disk or another cloud in the other. Drag to upload or download; queue and monitor large transfers.
Migrate between clouds
Copy straight from Amazon S3, Google Drive, or any connected backend into B2 - or out of it - without a visible intermediate download.
Verify with SHA-256
After a migration, run Folder Compare with content verification to re-check same-size files by hashing their actual bytes.
Keys in the Keychain
Your B2 application key lives in the macOS Keychain - never in plaintext config files.
Terminal at hand
A full terminal is one keystroke away for everything a GUI shouldn't do - synced to the active pane's directory.
Connect to B2 in 30 seconds
B2 speaks the S3 protocol, so it connects like any S3-compatible endpoint. You need two things from your Backblaze account: an application key and your bucket's endpoint.
- In Backblaze: App Keys > Add a New Application Key (note the keyID and applicationKey)
- Find your S3 endpoint on the bucket page - it looks like s3.us-west-004.backblazeb2.com
- In EmpiricCommander: New Connection > S3-compatible, paste the endpoint, keyID as Access Key, applicationKey as Secret Key
- Connect - your buckets appear in the pane
B2's S3-compatible API works with application keys created after May 2020; legacy b2 buckets may need a new key. A one-click B2 preset is coming in an upcoming release - the custom endpoint path above works today.
Migrate to B2 - and verify every byte
Moving a bucket from Amazon S3 to B2 to cut storage costs usually means rclone and a leap of faith. In EmpiricCommander you connect both providers, drag the folder across, and then run Folder Compare with SHA-256 content verification - it re-reads both sides and hashes the actual bytes, catching silent corruption that size-and-date comparison misses.
- Cross-cloud copy: S3 to B2, B2 to local, B2 to Google Drive
- Opt-in SHA-256 verification with progress and cancel
- Batch rename and Auto-Organize work on B2 files too
Like rclone, transfers pass through your device - bandwidth applies. For multi-terabyte one-time migrations, a server-side tool may fit better; for everything after, a file manager beats a config file.
On your Mac, iPad, and iPhone
The same B2 connection works on the native iPad and iPhone apps under one license - check a bucket or pull a file from wherever you are. One $29.99 purchase covers 1 Mac + 1 iPad + 1 iPhone. No subscription.
Frequently Asked Questions
Does Backblaze B2 have an official Mac client?
No - Backblaze provides a web console and a CLI, and points GUI users to third-party apps. EmpiricCommander connects to B2 via its S3-compatible API and gives you a full native file manager around it.
How do I connect EmpiricCommander to B2?
Create an application key in your Backblaze account, then add an S3-compatible connection in EmpiricCommander with your bucket's endpoint (e.g. s3.us-west-004.backblazeb2.com), the keyID as the access key, and the applicationKey as the secret. That's it.
Can I migrate from Amazon S3 to B2 with it?
Yes. Connect both providers and copy between panes - then verify the result with Folder Compare's opt-in SHA-256 content verification. Transfers pass through your device, like rclone.
Where are my B2 keys stored?
In the macOS Keychain (and the equivalent secure storage on iPad and iPhone) - never in plaintext files.
Does it work on iPhone and iPad?
Yes - native macOS, iPadOS, and iOS apps with one $29.99 one-time license covering 1 Mac, 1 iPad, and 1 iPhone, with a 7-day free trial.