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* * *
**command line tool and library**
for transferring data with URLs
(since 1998)
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Video: [mastering the curl command line tool](https://youtu.be/V5vZWHP-RqU)
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What is curl used for?
----------------------
curl is used in command lines or scripts to transfer data. curl is also **libcurl**, used in cars, television sets, routers, printers, audio equipment, mobile phones, tablets, medical devices, settop boxes, computer games, media players and is the Internet transfer engine for countless software applications in over _twenty billion installations_.
curl is used daily by virtually every Internet-using human on the globe.
curl supports
-------------
Protocols
DICT, FILE, FTP, FTPS, GOPHER, GOPHERS, HTTP, HTTPS, IMAP, IMAPS, LDAP, LDAPS, MQTT, POP3, POP3S, RTMP, RTMPS, RTSP, SCP, SFTP, SMB, SMBS, SMTP, SMTPS, TELNET, TFTP, WS, WSS
Proxies
SOCKS4, SOCKS5, HTTP, HTTPS (HTTP/1 and HTTP/2), tunneling, via unix domain sockets, haproxy, SOCKS+HTTP proxy chain
HTTP
GET, POST, PUT, HEAD, multipart formpost, HTTP/0.9, HTTP/1.0, HTTP/1.1, HTTP/2 (h2c, h2, prior knowledge), HTTP/3 (dual connect h1/h2 + h3 or h3-only), HSTS, Alt-Svc, cookies, PSL, etags, transfer compression, ranges, custom headers, custom method, follow redirects
FTP
IPv6 (EPRT, EPSV), STLS, upload/download, append, range, passive/active, kerberos, directory listing, custom commands
SCP + SFTP
known hosts, md5/sha256 fingerprint, compression, upload/download, directory listing
TLS
1.0 - 1.3, mutual authentication, STARTTLS, OCSP stapling, ECH, False Start, key pinning, PQC ready, session resumption, early data
Auth
Basic, Plain, Digest, CRAM-MD5, SCRAM-SHA, NTLM, Negotiate, Kerberos, Bearer tokens, AWS Sigv4, SASL, .netrc
HTTP Compression
gzip, brotli and zstd
Name resolving
DNS-over-HTTPS, custom address for host, name+port redirect, custom DNS servers, DNS caching
Connection
connection reuse, Interface binding, Happy Eyeballs, IPv4/IPv6-only, unix domain sockets, TCP keepalive, TCP Fast Open, TCP Nodelay, MPTCP, VLAN priority, IP Type Of Service
Transfers
transfer rate limiting, request rate limiting, stall detection, retries, timeouts
URLs
Unlimited amount, parallel and serial transfers, globbing
Output
IDN hostnames, custom info from transfer, metadata as JSON, per content-disposition, libcurl source code, bold headers
Who makes curl?
---------------
curl is free and [open source](docs/copyright.html "curl and libcurl are
licensed under a MIT/X derivate license") software and exists thanks to [thousands of contributors](docs/thanks.html "over 3,000 named
contributors") and our awesome [sponsors](/sponsors.html). The curl project [follows well established open source best practices](https://bestpractices.coreinfrastructure.org/projects/63 "Adheres to the Core Intrastructure Initiative's listed best
practices at Gold level"). You too can [help us](docs/help-us.html) improve!
What is the latest curl?
------------------------
The most recent stable version is **8.12.1**, released on 2025-02-13. Currently, 124 of the listed [downloads](download.html "Binary download packages for your platform!") are of the latest version.
Where is the code?
------------------
Check out the latest [source code from GitHub](https://github.com/curl/curl "git clone
the curl code").