**Send** is a fork of Mozilla's discontinued Firefox Send service which allows you to send files to others with a link. Files are encrypted on your device so that they cannot be read by the server, and they can be optionally password-protected as well. The maintainer of Send hosts a [public instance](https://send.vis.ee). You can use other public instances, or you can host Send yourself.
Send can be used via its web interface or via the [ffsend](https://github.com/timvisee/ffsend) CLI. If you are familiar with the command-line and send files frequently, we recommend using the CLI client to avoid JavaScript-based encryption. You can specify the `--host` flag to use a specific server:
**OnionShare** is an open-source tool that lets you securely and anonymously share a file of any size. It works by starting a web server accessible as a Tor onion service, with an unguessable URL that you can share with the recipients to download or send files.
**Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.
- Must not store decrypted data on a remote server.
**FreedomBox** is an operating system designed to be run on a [single-board computer (SBC)](https://en.wikipedia.org/wiki/Single-board_computer). The purpose is to make it easy to set up server applications that you might want to self-host.
We don't recommend using the [E2EE App](https://apps.nextcloud.com/apps/end_to_end_encryption) for Nextcloud as it may lead to data loss; it is highly experimental and not production quality.
**Syncthing** is an open-source peer-to-peer continuous file synchronization utility. It is used to synchronize files between two or more devices over the local network or the internet. Syncthing does not use a centralized server; it uses the [Block Exchange Protocol](https://docs.syncthing.net/specs/bep-v1.html#bep-v1) to transfer data between devices. All data is encrypted using TLS.
**Please note we are not affiliated with any of the projects we recommend.** In addition to [our standard criteria](about/criteria.md), we have developed a clear set of requirements to allow us to provide objective recommendations. We suggest you familiarize yourself with this list before choosing to use a project, and conduct your own research to ensure it's the right choice for you.
#### Minimum Requirements
- Must not require a third-party remote/cloud server.
- Must either have clients for Linux, macOS, and Windows; or have a web interface.
#### Best-Case
Our best-case criteria represents what we would like to see from the perfect project in this category. Our recommendations may not include any or all of this functionality, but those which do may rank higher than others on this page.
- Has mobile clients for iOS and Android, which at least support document previews.
- Supports photo backup from iOS and Android, and optionally supports file/folder sync on Android.
