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command line tool and library
for transferring data with URLs
(since 1998)

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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
Auth Basic, Plain, Digest, CRAM-MD5, SCRAM-SHA, NTLM, Negotiate, Kerberos, Bearer tokens, AWS Sigv4 and 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 software and exists thanks to thousands of contributors and our awesome sponsors. The curl project follows well established open source best practices. You too can help us improve!

What is the latest curl?

The most recent stable version is 8.8.0, released on 2024-05-22. Currently, 126 of the listed downloads are of the latest version.

Where is the code?

Check out the latest source code from GitHub.