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libcurl

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

**Top Sponsors**

Commercial support available

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Video: mastering the curl command line tool

## 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, export/import sessions

QUIC

0RTT handshakes

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, HTTPS RR

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 **8.15.0**, released on 2025-07-16. Currently, 103 of the listed downloads are of the latest version.

## Where is the code?

Check out the latest source code from GitHub.