Image to Image - HTTP POST Guide

This page serves as a guide for using the Pdfcrowd API to convert between images formats via HTTP POST. The API is HTTP-based and communicates through standard HTTP requests. You can call the API by sending an HTTP request to the API server address with options passed as POST data.

You can also check out our API Client Libraries if you want to implement the API in your favorite programming language.

Quick Start

Below are HTTP POST examples to help you quickly get started with the API. Explore our additional examples for more insights.


The authentication method for user credentials is HTTP Basic Access Authentication. You provide your credentials every time you make a request.

Server Address

The server address:

Older API versions:

  • specifically for API version 20.10
  • specifically for API version 18.10
  • deprecated

The content type for POST requests must be `multipart/form-data` if the request uploads any local files. Otherwise, `application/x-www-form-urlencoded` can also be used.

Response Headers

The HTTP response contains the following headers.

Name Description
x-pdfcrowd-debug-log URL of the debug log
x-pdfcrowd-remaining-credits The number of conversion credits remaining in your account
x-pdfcrowd-consumed-credits The number of credits used for the conversion
x-pdfcrowd-job-id The unique identifier for the conversion
x-pdfcrowd-output-size Size of the output data in bytes


  • If you are receiving an error, refer to the API Status Codes for more information.
  • Utilize debug_log to obtain detailed information about the conversion process, including load errors, load times, browser console output, etc.
  • Consult the FAQ for answers to common questions.
  • Contact us if you need assistance or if there is a feature you are missing.

POST Parameter Reference

Refer to the Image to Image POST Reference for a description of all options.