croc

Send file

TLDR

Send file

$ croc send [file]

Send multiple files

$ croc send [file1] [file2] [file3]

Send directory

$ croc send [directory/]

Receive file

$ croc [code-phrase]

Send with custom code

$ croc send --code [my-secret-code] [file]

Use custom relay

$ croc --relay [relay.example.com:9009] send [file]

Run relay server

$ croc relay

SYNOPSIS

croc [options] send [sendoptions] file_
croc [options] code-phrase

croc is a tool for securely transferring files between computers. It uses a relay server and PAKE (Password Authenticated Key Exchange) for end-to-end encryption. Works across different networks without port forwarding.
Features include resumable transfers, multiple files, cross-platform support, and optional self-hosted relay.

PARAMETERS

--code phrase

Use custom code phrase

--relay address

Specify relay server

--yes

Accept transfer without prompt

--out path

Output directory for received files

--overwrite

Overwrite existing files

--curve type

Encryption curve (p256, p384, p521, siec)

--hash algorithm

Hash algorithm (xxhash, imohash, md5)

--no-compress

Disable compression

--no-local

Disable local network transfer

--ports range

Port range for local transfer

COMMANDS

send

Send files or folders

relay

Run a relay server

ENVIRONMENT

CROC_RELAY

Default relay server

CROC_PASS

Default code phrase

HOW IT WORKS

1. Sender generates code phrase
2. Both parties connect to relay
3. PAKE establishes encrypted channel
4. Files transfer through relay (or directly on LAN)

CAVEATS

Default relay is public (croc.schollz.com). For sensitive transfers, run your own relay. Code phrases should be shared securely.