A PDF with transparent content is converted to a PDF/X file with checkmark stamp of approval before being sent to a printer

Convert PDF to PDF/X to Optimize for Print

Prepare PDF documents for printing and prepress by converting to PDF/X format
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PDF/X is a subset of the PDF format that is specifically designed for printing and prepress. PDF/X documents are created according to a strict set of standards, which ensures that they will be printed consistently across different devices and operating systems.

There are many benefits to converting PDF documents to PDF/X documents, including:

  • Improved print quality: PDF/X documents are printed with higher quality and consistency than regular PDF documents, because they embed all of the fonts and images that are needed to print the document correctly, flatten transparencies, and apply other optimizations to ensure reliable print results.
  • Reduced errors: PDF/X documents are less likely to contain errors or lead to problems with printing than regular PDF documents, because they are validated against a set of strict standards to fix or otherwise catch issues early.
  • Easier workflow: PDF/X documents can be more easily integrated into existing printing workflows, because they are compatible with a wide range of printing software and hardware and are required by many printing companies.

If you are planning to print a PDF document, it is highly recommended that you convert it to PDF/X format first. This will help to ensure that the document is printed with the highest possible quality and consistency.

Convert to PDF/X REST API Tool

Convert to PDF/X makes it easy to prepare your documents for print by applying all necessary changes to ensure the document conforms to strict PDF/X specifications.

Simply select your target PDF/X version from a list of the most commonly used options:

  • PDF/X-1a
  • PDF/X-3
  • PDF/X-4
  • PDF/X-6

Code Example: Convert to PDF/X   |   Load this into API Lab↗

        curl -X POST "https://api.pdfrest.com/pdfx" \ 
           -H "Accept: application/json" \ 
           -H "Content-Type: multipart/form-data" \
           -H "Api-Key: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxxx" \
           -F "output_type=PDF/X-4" 

The response from the API will be a JSON object containing links to each of the output files, ready for download.


Converting PDF documents to PDF/X documents is an essential step for improving the print quality and consistency of your documents. It is also a good way to reduce errors and make it easier to integrate your documents into existing printing workflows.

If you need to convert a large number of PDF documents to PDF/X format, consider integrating the pdfRest Convert to PDF/X API Tool into your workflow. This REST API service allows you to convert PDF documents to PDF/X format automatically and without having to install any software or download any dependencies into your development project.

Convert to PDF/X

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