Image to PDF API - HTTP Documentation


The Pdfcrowd API is HTTP-based, the communication is made through normal HTTP requests. You can call the API by sending an HTTP request to the API server address with options passed as POST data.

The POST request's content type must be multipart/form-data if the request includes any local files. Otherwise it can be application/x-www-form-urlencoded too.

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


Authentication is needed in order to use the Pdfcrowd API. The credentials used for accessing the API are your Pdfcrowd username and the API key. You can sign up for the Pdfcrowd API here.

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 is

Both HTTP and HTTPS protocols are supported.


Convert a local PNG file to a PDF file
curl -f -u "your_username:your_apikey" \
    -o logo.pdf  \
    -F "input_format=image"  \
    -F "output_format=pdf"  \
    -F "file=@/path/to/logo.png" \
Convert url with PNG file to a PDF file
curl -f -u "your_username:your_apikey" \
    -o logo.pdf  \
    -F "input_format=image"  \
    -F "output_format=pdf"  \
    -F "url=" \

Tips & Tricks

Image to PDF API Reference

Conversion Input

Parameter Description Default
The address of the image to convert.
The supported protocols are http:// and https://.
The path to a local file to convert.
The file can be either a single file or an archive (.tar.gz, .tar.bz2, or .zip).
The file must exist and not be empty.
The raw content to be converted.


Conversion Format

Parameter Description Default
The format of input file.
Allowed values:
  • image
    Image format is recognized automatically.



Parameter Description Default
The file name of the created file (max 180 chars). If not specified then the name is auto-generated.
The value of the Content-Disposition HTTP header sent in the response.
Allowed values:
  • attachment
    Forces the browser to pop up a Save As dialog.
  • inline
    The browser will open the result file in the browser window.


Image operations

Settings used for operations with images.

Parameter Description Default
Resize the image.
  • 200%
  • 1024x768
Rotate the image.



Parameter Description Default
Turn on the debug logging. Details about the conversion are stored in the debug log. The URL of the log is returned in the X-Pdfcrowd-Debug-Log response header or available in conversion statistics.
Allowed values:
  • true, 1 or on
  • false, 0 or off
Tag the conversion with a custom value. The tag is used in conversion statistics. A value longer than 32 characters is cut off.


Response Headers

HTTP response can contain the following headers.
You can find details about each conversion in your conversion log.

Name Description
X-Pdfcrowd-Debug-Log URL to the debug log
X-Pdfcrowd-Remaining-Credits the number of available conversion credits in your account
X-Pdfcrowd-Consumed-Credits the number of credits consumed by the conversion
X-Pdfcrowd-Job-Id the unique ID of the conversion
X-Pdfcrowd-Pages the total number of pages in the output document
X-Pdfcrowd-Output-Size the size of the output in bytes


  • Check API Status Codes in case of the error code is returned.
  • You can use debug_log to get detailed info about the conversion, such as conversion errors, time, console output.
  • Take a look at the FAQ section.