fsend

Free plan LinuxMacWebWindows

What fsend is

fsend is a free, open-source file transfer tool that works in a browser or from a command line. Its web app uses WebRTC to send files or folders directly to another browser. A sender selects content, shares a one-time code, and the receiver accepts the transfer in a browser tab. The site says file data stays out of fsend’s servers and travels through end-to-end encrypted WebRTC data channels. There is no stated file-size limit, although the connection and the receiver’s available disk space constrain transfers. Both browser tabs must remain open until completion. Any WebRTC-capable browser can work; Chrome, Edge, and Opera are recommended. Firefox and Safari buffer transfers in memory, save folders as ZIP files, limit transfers to available RAM, and cannot resume interrupted transfers. The command-line tool interoperates with the web app and has Linux, macOS, Windows, and source installation options. Debian and Ubuntu packages support x86_64 and aarch64. The CLI uses iroh with a fallback relay by default.

Who it suits

fsend suits people who want browser-based peer-to-peer transfers without a desktop app, as well as command-line users on Linux, macOS, or Windows. It is also useful for users who need open-source software and can keep both browser tabs open.

What it does well

Free plan with no stated file-size limit
End-to-end encrypted WebRTC data channels
File data does not touch fsend servers
Browser and command-line tools interoperate
CLI includes a fallback relay by default

What to know first

Both browser tabs must stay open
Firefox and Safari transfers use available RAM
Browser web app has no fallback relay
Desktop app is not available

Plans

Plan	Billed and limits	Price
Free	No file size limit · limited by connection and receiver’s free disk space	Free

As fsend.sh lists them, read 12 Oct 2026. The maker's own page has the final word.

Verdict

fsend provides direct browser transfers with encrypted WebRTC channels and no stated file-size ceiling. Browser compatibility and the requirement to keep both tabs open are important constraints, while its interoperable CLI adds another transfer route.

Facts from fsend's own pages

Browser compatibility: The site says any browser with WebRTC can work, and recommends Chromium-based browsers such as Chrome, Edge, or Opera for the best experience. · fsend.sh, 12 Oct 2026
Browser limits: Firefox and Safari buffer transfers in memory and save folders as ZIP files; the site says this limits transfer size to available RAM and prevents resuming interrupted transfers. · fsend.sh, 12 Oct 2026
CLI connectivity: The README says the webapp has no fallback relay and may not work depending on network or browser, while the CLI uses iroh, which provides a fallback relay by default. · github.com, 12 Oct 2026
CLI platforms: The download page lists Linux, macOS, and Windows installation options, plus source installation. · fsend.sh, 12 Oct 2026
Command line: fsend is also available as a command-line tool. · fsend.sh, 12 Oct 2026
Desktop app: No · fsend.sh, 21 Sept 2026
File size: The site says there is no file size limit; transfers are constrained by the connection and the receiver’s free disk space. · fsend.sh, 12 Oct 2026
Free plan: Yes · fsend.sh, 21 Sept 2026
Linux packages: The download page says its Debian/Ubuntu APT repository covers x86_64 and aarch64, and updates arrive through the normal apt upgrade. · fsend.sh, 12 Oct 2026
Online requirement: Both browser tabs must stay open until the transfer finishes. · fsend.sh, 12 Oct 2026
Open source: The site describes fsend as free and open source and links to its code on GitHub. · fsend.sh, 12 Oct 2026
Privacy: The site says WebRTC data channels are end-to-end encrypted and file data never touches fsend’s servers. · fsend.sh, 12 Oct 2026
Product components: The project README describes fsend as a peer-to-peer file transfer webapp and CLI tool that interoperate. · github.com, 12 Oct 2026
Purpose: fsend provides direct peer-to-peer file transfers in a browser using WebRTC. · fsend.sh, 12 Oct 2026
Transfer flow: Senders select files or folders, share a one-time code, and transfer files directly to the receiver’s browser. · fsend.sh, 12 Oct 2026

Where fsend stands on Freedom251

File transfer services#28 of 105