Browser-Side AES-256-GCM Encryption
Messages and files are encrypted locally with the Web Crypto API before upload, so Strumio stores ciphertext instead of readable content.
Private handoffs, encrypted in your browser
Share sensitive information without leaving readable copies behind
Strumio encrypts messages and files before upload, then gives you a private link with practical delivery controls. Share passwords, recovery codes, API keys, documents, and confidential notes without placing plaintext in email or chat history.
Every Strumio sharing feature, clearly explained
Strumio combines browser-side encryption with controls for sending, receiving, replying, requesting, and managing sensitive information. Complete links remain sensitive, and operational metadata is still processed to run the service.
URL Fragment Decryption Keys
The random decryption key stays after the # in the complete link, a fragment browsers do not send in normal web requests.
Local QR Code Sharing
Turn a complete SecretLink or active chat invitation into a scannable QR code in your browser, without sending the link to a remote QR service.
Optional Access Passwords
Require a separately shared password before encrypted content can be retrieved, adding another barrier if a link reaches the wrong person.
Configurable Expiration
Choose how long encrypted content remains available. Expiration limits later retrieval but cannot revoke information already revealed.
One-Time Access
Allow one successful encrypted-payload retrieval, then make it unavailable to later requests. The first viewer can still copy or capture plaintext.
Encrypted File Attachments
Attach files that are encrypted in the sender's browser and decrypted for preview or download in the recipient's browser.
Recipient Preview and Copy Tools
Recipients can preview supported files, download decrypted attachments, and copy message text without changing the encrypted delivery flow.
One Encrypted Recipient Reply
Let a recipient send one browser-encrypted reply to the original sender without moving the conversation into plaintext email.
Reusable Encrypted Request Links
Create a reusable request link so multiple people can submit separate encrypted messages and files back to you.
Guest Sending
Send a narrower, one-time encrypted message without creating an account when you need a quick private handoff.
Account Dashboard and Deletion
Signed-in senders can review message history, manage active shares, and delete messages or account data from one dashboard.
Device-Local Key Recovery and Local Copilot
Keep eligible recovery keys in your browser or export a recovery file, and opt into local guidance that never sends draft or decrypted content to an AI service.
Account-Free Temporary Rooms
Start a two-person encrypted text room without an account, choose a short expiration, and share its complete invitation link or local QR code.
Private and Group Chat
Signed-in creators can add encrypted files or create a temporary group conversation for up to 20 participants, with browser-side message encryption.
Panic Close
Quickly revoke your current participant session and clear that chat's in-memory and session data on your device without closing the room for everyone else.
Private Mail
Generate a temporary receiving address for service signups and unverified contacts. Incoming messages are encrypted at rest and mailboxes expire automatically.
Dead Drop File Sharing
Share a browser-encrypted chat attachment with a download limit. When its final permitted access is claimed, Strumio locks it and queues the stored ciphertext for deletion.
Split-Key Secrets
Distribute a single payload across multiple fragments (e.g., 2-of-3 or 3-of-5). The secret is only reconstructed when enough distinct viewers combine their pieces in the browser.
Temporary encrypted conversations
Temporary Private Chat Without an Account
Start a two-person encrypted text room immediately, or sign in when you need group conversations, encrypted files, Dead Drops, and more room controls.
Private conversations
Create a direct text room for two participants without providing an email address, profile, or permanent username.
Group conversations
Invite up to 20 participants to a temporary encrypted room using one complete invitation link.
Browser-encrypted messaging
Messages are encrypted and decrypted in participants' browsers with AES-256-GCM. The room key stays in the invitation URL fragment.
Secure conversation access
Room access uses the complete invitation link, participant capabilities, and an optional password derived in the browser.
Local QR invitations
Show or download a QR code for the complete active-room invitation. Strumio creates the code in your browser rather than sending the invitation to a QR service.
Temporary by design
Account-free rooms last 10 minutes, 1 hour, or 24 hours and are deleted when the creator ends them or server-enforced expiration occurs.
Panic Close for a quick exit
A participant can immediately revoke their own session and clear local room data. Other participants can continue unless the creator separately ends the room.
Dead Drop attachments
Send a browser-encrypted file with a limited number of permitted accesses. Reaching the limit locks the attachment and starts its deletion workflow.
Before inviting participants, review the private chat, Panic Close, and Dead Drop guide.
How to send an encrypted message
Create a secure message link in three straightforward steps. No encryption software or browser extension is required.
- Step 1
Write the sensitive text
Enter the information you need to share and choose a password, expiration time, or one-time access.
- Step 2
Encrypt it in your browser
Strumio creates a random key locally and sends only encrypted ciphertext and required delivery data to the server.
- Step 3
Share the private link
Your recipient opens the complete link and their browser decrypts the message locally.
Share information that should not live in chat history
Strumio is built for focused handoffs such as passwords, recovery codes, API keys, access instructions, private notes, and encrypted file attachments.
- Passwords
- Recovery codes
- API keys
- Private notes
- Access details
- Encrypted files
Make your next sensitive handoff a Strumio link
Encrypt a message or file in your browser, choose its delivery controls, and share the complete link through a channel you trust.
Get started