File transfer, reinvented
We built the platform we wished existed. Fast, secure, no complications.
Direct transfer between devices
Files travel straight between the two browsers. They are never uploaded to the server and never stored.
Block-level AES-256-GCM encryption
The key is derived locally through ECDH P-256 and HKDF-SHA256. Every data block is encrypted individually, with its own nonce.
Confirmation by key fingerprint
Before the transfer, both devices display the same 48-bit fingerprint. The connection is confirmed by hand, which rules out a third party in the middle.
No size limit
In Chrome and Edge incoming files are written straight to disk as they arrive, without being loaded into memory.
Simultaneous two-way transfer
Once connected, both parties can send and receive at the same time, with progress shown for each file.
Session code or invitation link
The code has six digits, is valid for 10 minutes and can be used once. The invitation link validates the key exchange automatically.
AES-256-GCM Encryption
Your files are encrypted with AES-256-GCM, the same algorithm used by banks and defense organizations worldwide. It is considered unbreakable with current technology.
Zero-Knowledge Architecture
The encryption key is generated exclusively in your browser and never reaches our servers. We cannot access your files - not technically, not legally, not under any circumstances.
Key in URL, Not on Server
The decryption key is transmitted to the recipient via the URL fragment (#key=...). Browsers never send the fragment to the server - it never appears in any access log and cannot be intercepted by us or third parties.
Web Crypto API
Encryption is handled by the browser native Web Crypto API, not a third-party library. This means no external code can intercept your data during the encryption process - the implementation is audited and maintained by browser vendors like Google and Mozilla.
Encrypted Before Upload
The entire file is encrypted in your browser before being split into chunks and uploaded. Even if a chunk were intercepted in transit, it would be completely unreadable without the key that never leaves your browser.
End-to-End Encryption
Your files are encrypted before leaving your device. Nobody can access them, not even us.
Password protection
Add a password to your transfer and only the recipient who knows it can download the files.
2FA Authentication
Protect your account with 2-step verification. 6-digit code via email on each login.
Email Verification
New accounts are only activated after confirming the email address, preventing fake registrations and automated spam.
Login History
View all authentication sessions: IP address, device and date of each login, to quickly detect unauthorized access.
Sign in with Google
Sign in quickly and securely using your Google account. No passwords to remember.
Large files, no problem
Chunked uploads with automatic resume. Transfer files up to 50 GB without interruptions.
Email notifications
The recipient automatically gets an email with the download link. You get confirmation when they download.
Auto-expiration
Files are automatically deleted after the set period. No forgotten data left on the server.
Self-Destroy
The file is automatically deleted after the first download. Ideal for confidential documents that should not be shared further.
File Preview
Recipients can preview images, PDFs and documents directly in the browser, without needing to download the file.
Folder Upload
Select an entire folder to send - it is automatically archived as a ZIP in the browser before upload, with no manual archiving needed.
File Request
Send a link and receive files from anyone. Ideal for accountants, lawyers, agencies — clients upload directly to you.
Full dashboard
Track all transfers, see who downloaded, when and from where. Total control.
Download statistics
See how many downloads each transfer had, with IP and date. Useful for tracking.
Flexible plans
Generous free plan, or upgrade for larger files, longer storage and advanced features.
Team Management
Invite team members, manage their access and roles directly from your account. Available for Business and Corporate plans.
Custom Branding
Customize the interface with your company logo and colors. Emails sent to recipients will carry your brand identity. Available for Business and Corporate.
Transfer Details
A dedicated page for each transfer with full history: who downloaded, how many times and when, plus delete or revoke options.
Invoices & Payments
Access the complete history of invoices and payments directly from your account, with the option to download in PDF format.
No account required
Send files instantly without creating an account. Sign up only if you want dashboard and extra features.
Multilingual
The interface is available in many languages. Auto-detected from your browser or selected manually.
Instant QR Code
Get a QR code with every transfer. Perfect for presentations, meetings or quick phone sharing.
Dedicated support
Business and Corporate customers get dedicated support with priority response times. We are here when you need us.
15-day guarantee
Try risk-free. If within the first 15 days you are not satisfied for any reason, we will refund your payment in full. No questions asked.
Scheduled send
Upload files now and set exactly when they should be sent. Perfect for campaigns, scheduled deliveries, or coordinating across time zones.
Custom expiry
Choose the exact date and time your download link expires. You decide when files disappear — not your plan's default.
Download limit
Restrict how many times a link can be accessed. Great for controlled distribution — the link auto-deactivates after the set number of downloads.
Voice Message
Attach a voice message recorded directly in the browser to your transfer. The recipient can listen before downloading.
Dynamic Watermark
Automatically add a custom watermark to sent images and documents, protecting your content.
Secure Payments
Subscriptions are paid by card via Stripe or bank transfer. Instant activation for card payments.
Personal sales page
Activate a public shop at your custom URL and sell digital products directly from your account. No third-party platforms needed.
Secure download links
Generate a unique link per buyer with a limited number of downloads and an expiry date — you stay in full control of access.
Watermarked preview
Buyers can preview your product before purchasing. Images are automatically protected with a watermark.
Buyer signature in file
Optionally embed the buyer's details into the downloaded file — useful for copyright protection and traceability.
Cloud storage space
A dedicated space to upload and keep files without expiration, organized into projects and folders.
Projects and folder organization
Create projects for each client or department, with subfolders at any depth for perfect organization.
Team collaboration
Invite team members to access your projects. Each project can be shared with different users.
R / RW permissions
Control exactly what each user can do: read-only (R) or read and write (RW) per project.
Direct browser preview
Open PDFs, images, videos, audio files and text documents directly in the browser, without downloading.
Activity history
Every action — upload, download, open, delete — is recorded with the user and exact time.
WebDAV access — network drive
Map SynBox as a network drive in Windows or Mac. Open and save Word, Excel, PDF files directly from local applications.
NFS volume storage
Files are stored on NFS volumes with automatic swap when the usage threshold is reached, without interruptions for users.