Features

Built on top of libuv and WebGL2 for speed
Fully-featured terminal with CJK and IME support
ZMODEM (lrzsz) / trzsz file transfer support
Sixel image output support (img2sixel / lsix)
SSL support based on OpenSSL / Mbed TLS
Run any custom command with options
Basic authentication support and many other custom options
Cross platform: macOS, Linux, FreeBSD/OpenBSD, OpenWrt, Windows

Installation

Install on macOS

Install with Homebrew: brew install ttyd
Install with MacPorts: sudo port install ttyd

Install on Linux

Install on Debian/Ubuntu: sudo apt install ttyd
Install the snap: sudo snap install ttyd --classic
Install on OpenWrt: opkg install ttyd
Install on Gentoo: clone the repo and follow the directions here.
Install with Homebrew : brew install ttyd
Precompiled static binaries: download from the releases page

Install on Windows

Binary version (recommended): download from the releases page
Install with WinGet: winget install tsl0922.ttyd
Install with Scoop: scoop install ttyd
Compile on Windows

Usage

Command-line Options

USAGE:
    ttyd [options] <command> [<arguments...>]

OPTIONS:
    -p, --port              Port to listen (default: 7681, use `0` for random port)
    -i, --interface         Network interface to bind (eg: eth0), or UNIX domain socket path (eg: /var/run/ttyd.sock)
    -U, --socket-owner      User owner of the UNIX domain socket file, when enabled (eg: user:group)
    -c, --credential        Credential for basic authentication (format: username:password)
    -H, --auth-header       HTTP Header name for auth proxy, this will configure ttyd to let a HTTP reverse proxy handle authentication
    -u, --uid               User id to run with
    -g, --gid               Group id to run with
    -s, --signal            Signal to send to the command when exit it (default: 1, SIGHUP)
    -w, --cwd               Working directory to be set for the child program
    -a, --url-arg           Allow client to send command line arguments in URL (eg: http://localhost:7681?arg=foo&arg=bar)
    -W, --writable          Allow clients to write to the TTY (readonly by default)
    -t, --client-option     Send option to client (format: key=value), repeat to add more options
    -T, --terminal-type     Terminal type to report, default: xterm-256color
    -O, --check-origin      Do not allow websocket connection from different origin
    -m, --max-clients       Maximum clients to support (default: 0, no limit)
    -o, --once              Accept only one client and exit on disconnection
    -q, --exit-no-conn      Exit on all clients disconnection
    -B, --browser           Open terminal with the default system browser
    -I, --index             Custom index.html path
    -b, --base-path         Expected base path for requests coming from a reverse proxy (eg: /mounted/here, max length: 128)
    -P, --ping-interval     Websocket ping interval(sec) (default: 5)
    -6, --ipv6              Enable IPv6 support
    -S, --ssl               Enable SSL
    -C, --ssl-cert          SSL certificate file path
    -K, --ssl-key           SSL key file path
    -A, --ssl-ca            SSL CA file path for client certificate verification
    -d, --debug             Set log level (default: 7)
    -v, --version           Print the version and exit
    -h, --help              Print this text and exit

Read the example usage on the wiki.