How to edit pdf form online

 Ref: https://www.pdfescape.com/

Get States of fields of pdf using Itext

 PdfReader pdfReader = new PdfReader(bytes);

        AcroFields acroFields = pdfReader.getAcroFields();

        Map<String, AcroFields.Item> map = acroFields.getFields();

        List<String> keyList = new ArrayList<>();

        map.forEach((k, v) -> {

            try {

                String[] arr = acroFields.getAppearanceStates(k);

                System.out.println(k+":"+Arrays.toString(arr));

                keyList.add(k);

            } catch (Exception e) {

                e.printStackTrace();

            }        });