Hello Markus,

I've created PDFBOX-6178. Unfortunately the links are expired. Could
you provide the test file again. OK to add it to the issue?

BR
Maruan

Am Mittwoch, dem 18.03.2026 um 14:30 +0000 schrieb Markus Mensinger via
users:
> Hi PdfBox Team,
> 
> may I ask if this issue is still being addressed? I'd be happy to
> help with additional documents or test code.
> 
> Thanks
> Markus
> 
>      
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Markus Mensinger via users <[email protected]>
> > Gesendet: Freitag, 13. Februar 2026 08:49
> > An: [email protected]
> > Cc: Markus Mensinger <[email protected]>
> > Betreff: AW: PdfBox renames RadioButton with Umlaut
> > 
> > Hi Andreas,
> > 
> > sorry for the late reply. I didn't receive the email about your
> > message.
> > 
> > The original document. No radio button is selected:
> > https://signotecgmbh-
> > my.sharepoint.com/:b:/g/personal/markus_mensinger_signotec_de/IQAG_
> > LM96
> > YsmR5Bbs-B6GdjZAe_Ohx5ZXtTrGjqhBhbnvlI?e=hLirvE
> > 
> > Radio button "männlich" selected with PdfBox:
> > https://signotecgmbh-
> > my.sharepoint.com/:b:/g/personal/markus_mensinger_signotec_de/IQBd-
> > bq-
> > lOxGSoxfH6RRv1DiAd05O7Pq6qRBlJJBafeklP4?e=SHrniB
> > 
> > Radio button "männlich" selected with Acrobat Pro:
> > https://signotecgmbh-
> > my.sharepoint.com/:b:/g/personal/markus_mensinger_signotec_de/IQB5n
> > YOYQ
> > EJ8QJMizyMsxnTjAXDRsSO12tsNbvLwQxKbZ3Y?e=bNhHOR
> > 
> > Thanks
> > Markus
> > 
> > > -----Ursprüngliche Nachricht-----
> > > Von: Markus Mensinger via users <[email protected]>
> > > Gesendet: Freitag, 6. Februar 2026 17:06
> > > An: [email protected]
> > > Cc: Markus Mensinger <[email protected]>
> > > Betreff: PdfBox renames RadioButton with Umlaut
> > > 
> > > [Sie erhalten nicht häufig E-Mails von [email protected].
> > > Weitere Informationen, warum dies wichtig ist, finden Sie unter
> > > https://aka.ms/LearnAboutSenderIdentification ]
> > > 
> > > Hi PdfBox team,
> > > 
> > > is the following maybe an issue in PdfBox?
> > > 
> > > Steps to reproduce
> > > ===============
> > > 1. Create a document that contains a radio button with Umlaut in
> > > name.
> > > I can give you an example document.
> > > Let's say: A radio group "Geschlecht" with the buttons "männlich"
> > > and
> > "weiblich".
> > > Do not use PdfBox for this step. I used Acrobat Pro 2020.
> > > The name/value of the "männlich" button is encoded as
> > > "/m#e4nnlich" in
> > > the PDF.
> > > 
> > > 2. Update the value of the radio group with PdfBox to "männlich"
> > > and
> > > save it to a new document.
> > > 
> > > import java.io.File;
> > > import org.apache.pdfbox.Loader;
> > > import org.apache.pdfbox.pdmodel.PDDocument;
> > > 
> > > public class UpdateRadioGroup {
> > > 
> > >     private static final String INPUT_FILE = "form_empty.pdf";
> > >     private static final String OUTPUT_FILE =
> > > "form_selected.pdf";
> > >     private static final String FIELD_NAME = "Geschlecht";
> > >     private static final String FIELD_VALUE = "männlich";
> > > 
> > >     public static void main(String[] args)
> > >             throws Exception {
> > > 
> > >         try (PDDocument document = Loader.loadPDF(new
> > > File(INPUT_FILE))) {
> > >             document.getDocumentCatalog()
> > >                     .getAcroForm(null)
> > >                     .getField(FIELD_NAME)
> > >                     .setValue(FIELD_VALUE);
> > > 
> > >             document.save(new File(OUTPUT_FILE));
> > >         }
> > >     }
> > > }
> > > 
> > > 3. Validate the name/value of the "männlich" button in the new
> > > document in a text editor. PdfBox encodes "männlich" to
> > > "/m#c3#a4nnlich" (see
> > > COSName.writePDF() ).
> > > 
> > > The problem
> > > ===============
> > > PdfBox renames the radio button from "männlich" to "männlich". 
> > > Or
> > > "/m#e4nnlich" to "/m#c3#a4nnlich" in PDF-format.
> > > When you read the document again, PdfBox converts "#c3#a" to "ä"
> > > but
> > > all other programs do not. I tested Acrobat Pro 2020, actual
> > > Acrobat
> > > Reader, PDFXplorer from https://www.o2sol.com
> > > 
> > > 
> > > Thanks
> > > Markus
> > > 
> > > -----------------------------------------------------------------
> > > ----
> > > To unsubscribe, e-mail: [email protected]
> > > For additional commands, e-mail: [email protected]
> > 
> > 
> > -------------------------------------------------------------------
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> 
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