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Transfer data with URLs using curl, a command-line tool and library documented on its project site.
About curl
curl is a command-line tool and library for transferring data with URLs. It is used in command lines or scripts, and libcurl is used as a transfer engine in software applications and devices.
It supports protocols such as HTTP, HTTPS, FTP, SFTP, SMTP and IMAP, with options for proxies, authentication, TLS handling and transfer controls including retries, timeouts and rate limiting.
Key features
- Transfer data with URLs from command lines or scripts
- Support HTTP methods such as GET, POST, PUT and HEAD
- Support protocols including FTP, SFTP, SMTP, IMAP and MQTT
- Work with SOCKS4, SOCKS5, HTTP and HTTPS proxies
- Authenticate with Basic, Digest, NTLM, Kerberos and Bearer tokens
- Control transfers with retries, timeouts and rate limiting
Best for: Developers and script users who transfer data with URLs via command line or libcurl.
Good for
- Supports listed protocols including HTTP, FTP, SFTP, SMTP and IMAP
- Includes settings for proxies, authentication, TLS and connection reuse
- Source code is referenced as available on GitHub
curl at a glance
- Website
- curl.se
- Category
- Development › Web Development
- Type
- Online tool
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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curl FAQ
What is curl used for?
It is used in command lines or scripts to transfer data, and libcurl is used as a transfer engine in software applications.
What is the latest curl version?
The site lists 8.22.0 as the most recent stable version, released on 2026-09-02.
Where is the curl code?
The project site points to the latest source code on GitHub.
Is something wrong or out of date?
Tell us and an editor will check it.
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