To update a PDF document, you have 4 options:

1. Instead of having a PDF, turn it into an accessible webpage.  This is the preferred option to meet accessibility regulations.
2. If the PDF is plain text (no images) you can edit it by opening the PDF via Microsoft Word. Microsoft Word has a built-in accessibility checker that can be used to check documents. Once you have run the Accessibility checker and have made the required updates in Word, you can re-save it as a PDF.
3. If you have the original word document that created the PDF in the first place, then you can open this in Word, run the Accessibility checker and make the required updates. You can then re-save it as a PDF.
4. Failing the above 3 methods, you can pay for Acrobat Pro which will allow you to edit the PDF without having to use Word.

Please note if the PDFs were published before 23 Sept 2018, they are exempt from latest accessibility regulations, as long as they are not providing a service to the user, such as a form. Learn more about this exemption on our Document Accessibility guidance page