A native desktop file manager for Amazon S3 and S3-compatible services.
S3UI is a free, open-source, cross-platform desktop app that makes Amazon S3 feel like a local file system. It provides a dual-pane file manager — local files on the left, S3 on the right — with drag-and-drop transfers, large-file handling, and built-in cost tracking.
Works with Amazon S3, MinIO, and any S3-compatible storage.
Features
- Dual-pane browser — local filesystem and S3 side by side
- Drag and drop — drop files onto the S3 pane to upload
- Upload and download — right-click context menus or drag and drop
- New folder — toolbar button and context menu
- Multipart uploads — large files are split and uploaded in parallel
- Resume support — interrupted transfers pick up where they left off
- Transfer queue — pause, resume, cancel, and retry individual transfers
- Cost tracking — estimates your monthly S3 costs as you work
- AWS CLI profiles — auto-discovers profiles from
~/.aws/config - Custom endpoints — connect to MinIO, LocalStack, or any S3-compatible service
- Secure credentials — stored in your OS keychain via
keyring - Setup wizard — guided first-run configuration
- Keyboard shortcuts — Ctrl+1/2 to switch panes, Ctrl+R to refresh, Ctrl+F to filter
- System notifications — notifies on large transfer completion when the app is in the background
Install
Requires Python 3.11+ and a running display server (X11, Wayland, macOS, or Windows).
Quick start
On first launch, the setup wizard walks you through connecting your AWS account or S3-compatible service. You can also configure connections later from Settings.
MinIO example
In the setup wizard or Settings > Credentials > Add Profile:
| Field | Value |
|---|---|
| Profile Name | my-minio |
| Access Key ID | minioadmin |
| Secret Access Key | minioadmin |
| Region | us-east-1 |
| Endpoint URL | http://localhost:9000 |
Development
git clone https://github.com/justinGrosvenor/s3ui.git cd s3ui python -m venv .venv && source .venv/bin/activate pip install -e ".[dev]" pre-commit install pytest