cURL Command Builder
Build a curl command with a proxy, custom headers, method and body.
curl \ -L \ -H 'User-Agent: Mozilla/5.0' \ -H 'Accept: application/json' \ 'https://api.example.com/data'
About this tool
curl is the go-to tool for testing HTTP requests, but its flags are easy to forget — especially when routing through a proxy with authentication and a stack of custom headers.
Fill in the fields and this builder assembles a correct, copy-pasteable curl command, with values safely quoted for the shell. Add a proxy and credentials to quickly check whether a proxy works against a given endpoint.
Frequently asked questions
Use -x host:port for the proxy and -U user:pass for proxy authentication. This builder adds both for you when you fill in the proxy fields.
More tools
View allIP Address Lookup
Check the geolocation, ISP, organization and ASN of any IP — or your own.
Browser Fingerprint
See what every website can read about your browser, device and identity.
Password Generator
Create strong, random passwords with a live strength meter — all in your browser.
Subnet Calculator
Turn any IPv4 CIDR block into its network, broadcast, mask and host range.
User-Agent Parser
Decode any user-agent string into browser, engine, OS and device type.
IP Address Converter
Convert an IPv4 address between dotted decimal, integer, hex and binary.
Proxy List Formatter
Convert a proxy list between host:port, user:pass@host:port and more.
Random User-Agent Generator
Generate realistic, up-to-date user-agent strings for desktop and mobile.
JSON Formatter & Validator
Pretty-print, minify and validate JSON with clear error messages.
Base64 Encode / Decode
Encode text to Base64 or decode it back, with full UTF-8 support.
URL Encode / Decode
Percent-encode text for safe use in URLs, or decode it back.
JWT Decoder
Decode a JSON Web Token to inspect its header, payload and expiry.
Unix Timestamp Converter
Convert Unix timestamps to human dates and back, in seconds or milliseconds.
Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text.
Password Strength Tester
Estimate a password's entropy and how long it would take to crack.
Passphrase Generator
Create memorable, high-entropy passphrases from random words.
UUID & API Key Generator
Generate v4 UUIDs or random API keys in bulk, securely in your browser.