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croc

croc

Secure, fast file transfers from the command line

softwareLarge File TransferFile TransferSecurityCommand-Line
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Our Verdict

Best for

Developers needing quick, encrypted CLI file transfers

Skip if

Users requiring a full-featured graphical interface

What is croc?

croc is an open-source command-line tool that lets you quickly and safely transfer files and folders between devices without needing a central server. It uses end‑to‑end encryption and works across Windows, macOS, Linux, and the web, making it ideal for developers and power users who need a reliable way to share data. The tool is self‑hosted, free to use, and integrates with existing workflows via simple commands and scripts. With minimal configuration, croc handles large files, streams data in real time, and provides clear progress feedback, all while keeping your transfers private.

SpecificationsAI-estimated

deploymentSelf-hosted
open source✅ Yes
github stars38,172
api available❌ No
support optionsEmail, GitHub Issues
primary languageGo

Key Features of croc

croc encrypts all data with AES‑256, ensuring that only the intended recipient can decrypt the files.
Transfers are initiated with a single command, and the tool automatically negotiates a relay server if a direct connection cannot be made.
Supports resumable transfers, allowing interrupted uploads or downloads to continue without restarting.
Allows sending both individual files and entire directories while preserving file permissions on Unix-like systems.
Provides real‑time progress bars and speed metrics for each transfer, helping users monitor performance.
Can operate in a self‑hosted mode, letting organizations run their own relay servers for added control.
Integrates with scripts and CI pipelines, enabling automated artifact distribution in development workflows.
Offers optional password protection in addition to encryption for an extra layer of security.

Use Cases for croc

1

Share large build artifacts

Quickly send compiled binaries between CI agents and developers.

2

Transfer logs for debugging

Securely move log files from remote servers to local machines for analysis.

3

Distribute configuration bundles

Send configuration directories across environments without exposing them to third‑party services.

4

Ad‑hoc peer‑to‑peer file sharing

Provide a fast, encrypted way for team members to exchange files without setting up FTP.

Pros & Cons of croc

Pros

  • Free and open‑source
  • End‑to‑end encryption by default
  • Works on all major OSes
  • Simple single‑command usage

Cons

  • Requires both parties to have croc installed
  • Relay server may add latency if self‑hosted
  • Limited GUI; primarily command‑line based

Frequently Asked Questions

Do I need an account to use croc?

No, croc works without any registration; you just need the binary on each device.

Is the transfer encrypted?

Yes, all data is encrypted with AES‑256 before leaving your machine.

Can I run my own relay server?

Absolutely; croc can be configured to use a self‑hosted relay for full control over the transfer path.

What is the maximum file size?

croc has no built‑in size limit; the only constraints are network bandwidth and available disk space.

Pricing Overview

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Free

Detailed plans are not listed. Visit the official website for pricing information.

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About the Tool

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Platforms
WebWindowsMacLinux
Target AudienceDevelopers and power users

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Tags

File TransferSecurityCommand-LineCross-PlatformOpen-Source

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