Encryption & Private Sharing

Available on web, iOS, Android, and desktop, Proton Mail is an encrypted email service that offers free accounts.

Search the MIT PGP public key server for keys by email address or name, then retrieve the matching public key.

An expiring text-sharing service with time and view limits and an open-source self-hosting route.

The Hemmelig.app project shares encrypted secrets to help keep sensitive information out of chat logs, email, and similar channels.

NordLocker provides encrypted cloud storage and a private file vault for securing, backing up, accessing, and sharing files across devices.

Burn My Note creates encrypted notes that self-destruct after reading, with optional password protection and configurable expiration times.

GnuPG implements the OpenPGP standard and provides tools to encrypt and sign data and communications, with key management and directory access.

Share one-time secrets through a browser-based platform that encrypts them with AES before sharing.

Peergos provides end-to-end encrypted storage, file sharing, and sync while also protecting file metadata and sharing relationships, per its site.

Tuta is an email service whose repository says it encrypts emails, contacts, and calendar entries across users’ devices.

Internxt offers encrypted cloud storage using zero-knowledge technology, with additional products listed for VPN, antivirus, cleaner, and mail.

OneTimeSecret creates self-destructing links for sharing passwords and other sensitive information; the page also describes self-hosting.

Tuta offers encrypted email, calendar, and contacts, with apps that the site says protect personal data using end-to-end encryption.

Koofr provides web, desktop, and mobile file access, supports WebDAV and Rclone, and can connect Dropbox, Google Drive, and OneDrive accounts.

Yopass encrypts secrets in the browser and creates one-time links that expire, providing a way to share sensitive information without accounts.

Minisign signs files and verifies signatures through a simple command-line tool.

This OpenPGP page lists email applications that support the standard directly or through additional software, across several desktop platforms.

With backup and sync, Stingle Photos offers a gallery and camera app; its page says photos and videos are encrypted before storage.

Portable Secret creates self-contained HTML files that decrypt messages or files locally in a browser using a password.

The free Windows GnuPG distribution provides file and email encryption and certificate management.

A free Mac and Windows application for encrypting individual files and folders for sharing.

FileShot’s repository provides a browser based AES-256-GCM zero knowledge encryption library for client side file sharing.

Mailvelope adds PGP end-to-end encryption to Gmail and other webmail services, with options for private users and organizations.

Encrypt email and files on Windows with Gpg4win, a software package based on GnuPG.