Transform your USB drive into a private, secure data vault
Trusted
Secure
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What is Lumin?
Lumin is a free personal mobile data security app that lets you manage USB drives directly from your phone.
It automatically encrypts and backs up your photos, videos, and files to a USB drive using a “one-file, one-key” encryption mechanism—so even if the USB drive is lost, your data remains completely safe.
What Can Lumin Do?
True File-Level Security with “One File, One Key”
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Every file is encrypted with an independent random key
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No “single master password” risk
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Even if one file key is compromised, all other files remain safe
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Supports high-strength AES encryption
Security is not a slogan—it’s built into the design.
Direct Phone-to-USB Connection – No Computer Needed
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Supports OTG direct connection to USB drives
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No computer or internet required
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Plug and play
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Encrypt, decrypt, and browse files entirely on your phone
Phone + USB Drive = Your Portable Encrypted Storage Center
Automatic Encrypted Backup for Photos & Videos
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Automatically scans photos and videos on your phone
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One-tap to enable “Auto Encrypted Backup”
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New files are encrypted and backed up automatically
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Supports incremental backup
You focus on capturing life. Lumi takes care of security.
Decrypt Anytime When You Need
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Decrypt encrypted files from the USB drive back to your phone
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Batch export supported
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Flexible options: view only, or restore to original files
Total control, whenever you need it.
Browse Encrypted Files Without Decrypting
You can directly:
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View encrypted photos
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Play encrypted videos
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Open encrypted documents
All without decrypting to your phone—
private viewing, zero risk of leakage.
One Account, Access Across Multiple Devices
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Log into the same account on different phones or tablets
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Securely access encrypted files on your USB drive
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Data travels with you, not with a device
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No data migration needed when switching phones
One account. Multiple devices. Same secure data.
Make Your Contacts Backup Safer and Simpler
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Automatic backup keeps your contacts always up to date
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Smart merging of contacts across multiple devices
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Encrypted storage on USB drives or external SSDs
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No reliance on the cloud – your contacts belong only to you
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One-click restore makes switching phones effortless
With Flowlight Contacts Backup, your contact data is safer, more private, and always under your control.
Why Choose Lumin?
| Feature | Lumi | Traditional Cloud Storage |
|---|---|---|
| Data under your control | ✔ | ✘ |
| Internet required | ✘ | ✔ |
| Reliance on third-party servers | ✘ | ✔ |
| Data safe if USB is lost | ✔ | ✘ |
| Offline usage | ✔ | ✘ |
Real-World Use Cases
Protect Personal Photos and Privacy
Don’t want to store private photos on cloud services?
Worried about data being exposed if your phone is lost?
With Lumi:
Take photos → Auto encrypt → Backup to USB
Even if your phone or USB drive is lost,
no one can access your private data.
Carry Important Files Securely
Contracts, IDs, designs, study materials…
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Storing them on your phone feels risky
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Uploading to the cloud feels unsafe
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Saving to USB alone feels unreliable
Lumi helps you:
Turn any ordinary USB drive into a secure encrypted vault.
Expand Your Phone Storage Safely
Running out of phone space?
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Encrypt and store large videos directly to USB
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Free up phone storage
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View files anytime you need
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No need to buy cloud storage
More space. Lower cost. Better security.
Use the Same Data Across Devices
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Switch phones without hassle
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Use multiple devices with the same USB drive
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Just plug in and access encrypted files
Your data follows you, not your device.
Lumin’s Mission
Give ordinary USB drives bank-level security
Make personal data protection simple for everyone
Help users build their own private, secure data space
Security made simple—this is Lumin.