curl_escape - URL encode a string

Added in curl 7.1

Obsolete function. Use curl_easy_escape(3) instead. This function converts the given input string to a URL encoded string and return that as a new allocated string. All input characters that are not a-z, A-Z or 0-9 are converted to their "URL escaped" version (%NN where NN is a two-digit hexadecimal number). If the length argument is set to 0, curl_escape(3) uses strlen() on string to find out the size. You must curl_free(3) the returned string when you are done with it.

int main(void) { char *output = curl_escape("data to convert", 15); if(output) { printf("Encoded: %s\n", output); curl_free(output); } }

Since 7.15.4, curl_easy_escape(3) should be used. This function might be removed in a future release.

curl_escape - URL encode a string

This functionality affects all supported protocols

A pointer to a null-terminated string or NULL if it failed.

curl_free(3), curl_unescape(3) libcurl 2025-06-16 curl_escape(3)

#include <curl/curl.h> char *curl_escape(const char *string, int length);