A native Google Cloud Storage GUI for iPhone, iPad & Mac
Enterprise-grade storage, reachable over the S3-compatible XML API. Universal S3 Client connects over the S3 API — browse buckets, transfer files and share presigned links, free and open source.
https://storage.googleapis.com
facts
Google Cloud Storage at a glance
- endpoint
- https://storage.googleapis.com
- auth
- HMAC Access Key · HMAC Secret
- regions
- 37 regions plus us/eu/asia multi-regions
- storage
- around $0.020/GB/month (Standard, 2026)
- egress
- tiered per-GB pricing
- One endpoint for every region
- Storage classes down to Archive
- Multi-regional replication
setup
Get your Google Cloud Storage access keys
Credentials are created in the Google Cloud Console — here's the exact path:
- 1
Open the Google Cloud Console and go to Cloud Storage → Settings.
- 2
Select the "Interoperability" tab — this is Google’s S3-compatible XML API.
- 3
Create an HMAC key for a service account (recommended) or for your user account.
- 4
Copy the HMAC access key and secret into Universal S3 Client — the endpoint is always https://storage.googleapis.com.
good to know
Before you connect
GCS speaks S3 through its XML "interoperability" API: you authenticate with HMAC keys, not with service-account JSON files or OAuth.
The service account behind the HMAC key needs Storage Object Admin (or equivalent) on the buckets you want to manage.
features
What you can do with Google Cloud Storage
- Browse Google Cloud Storage buckets and folders with breadcrumbs, list or grid view, and image thumbnails.
- Upload from your photo library or files with multipart transfers and a real progress bar.
- Generate time-limited presigned URLs to share private objects with anyone.
- Preview and edit JSON, YAML, CSV and text files in place — changes save back to the bucket.
faq
Google Cloud Storage — frequently asked
+ Does Google Cloud Storage work with S3 clients?
Yes, through its XML interoperability API. Create an HMAC key in Cloud Storage settings and any S3 client — including Universal S3 Client on iPhone, iPad and Mac — can list buckets, upload and download objects.
+ Do I need a service account JSON file?
No. The S3-compatible path uses HMAC keys (an access key and secret, like AWS). You create them on the Interoperability tab of Cloud Storage settings, ideally bound to a service account.
+ Which endpoint do I use for GCS?
Always https://storage.googleapis.com, regardless of the bucket’s region — Google routes requests to the right location.
+ Can I preview files stored in GCS from my phone?
Yes — Universal S3 Client previews and edits JSON, YAML, CSV and text files in place, and shows image thumbnails, straight from your GCS buckets.
related
Also worth a look
The free Google Cloud Storage client for your pocket
Install the app, paste your Google Cloud Storage keys, and manage your buckets from anywhere.