CURLINFO_SIZE_DOWNLOAD - get the number of downloaded bytes

Added in curl 7.4.1

Deprecated since 7.55.0.

Pass a pointer to a double to receive the total amount of bytes that were downloaded. The amount is only for the latest transfer and gets reset again for each new transfer. This counts actual payload data, what's also commonly called body. All meta and header data is excluded and not included in this number. CURLINFO_SIZE_DOWNLOAD_T(3) is a newer replacement that returns a more sensible variable type.

int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); /* Perform the request */ res = curl_easy_perform(curl); if(!res) { /* check the size */ double dl; res = curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &dl); if(!res) { printf("Downloaded %.0f bytes\n", dl); } } } }

CURLINFO_SIZE_DOWNLOAD - get the number of downloaded bytes

This functionality affects all supported protocols

curl_easy_setopt(3) returns a CURLcode indicating success or error. CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors(3).

CURLINFO_SIZE_DOWNLOAD_T(3), CURLINFO_SIZE_UPLOAD_T(3), CURLOPT_MAXFILESIZE(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2025-06-16 CURLINFO_SIZE_DOWNLOAD(3)

#include <curl/curl.h> CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SIZE_DOWNLOAD, double *dlp);