Bug 170390 - At the font Liberation Sans with "bold" umlauts are not properly rendered at PDF export
Summary: At the font Liberation Sans with "bold" umlauts are not properly rendered at ...
Status: RESOLVED NOTABUG
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Writer (show other bugs)
Version:
(earliest affected)
25.8.4.2 release
Hardware: x86-64 (AMD64) Windows (All)
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2026-01-19 17:02 UTC by Stephan
Modified: 2026-01-22 12:58 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:


Attachments
Screenshot with Adobe reader. (148.47 KB, image/png)
2026-01-21 22:07 UTC, m_a_riosv
Details
This file is the writer document *.odt (35.41 KB, application/vnd.oasis.opendocument.text)
2026-01-22 12:35 UTC, Stephan
Details
PDF output by libreoffice of the *.odt file (75.10 KB, application/pdf)
2026-01-22 12:41 UTC, Stephan
Details

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Description Stephan 2026-01-19 17:02:17 UTC
Description:
Font Libaration Sans: PROBLEM at the PDF-conversion at bold font of Umlauts Ö=Oe, Ü=Ue, ä=ae, ö=oe, ü=ue; the dots above the normal character are omitted!

(in font Arial all characters are properly rendered)

Steps to Reproduce:
1. Start a text document and enter these two lines as sample:

Font Liberation Sans <without further attribute> Sample "Ä=Ae, Ö=Oe, Ü=Ue, ä=ae, ö=oe, ü=ue"-PDF-Export-Problem at Umlauts
Font Liberation Sans, with attribute BOLD Sample "Ä=Ae, Ö=Oe, Ü=Ue, ä=ae, ö=oe, ü=ue"-PDF-Export-Problem at Umlauts

2. Export as PDF
3. Open the PDF
In the BOLD line only the capital "Ä" is properly rendered with the two small dots above the standard character "A"; at "Ö,Ü,ä,ö,ü" the dots above the standard characters are missing.

Actual Results:
O, U, a, o , u (instead of Ö, Ü, ä, ö, ü.)

Expected Results:
All umlauts should be properly rendered in the PDF.

Note: When changing the font from "Liberation Sans" to "Arial" then the problem has disappeared; all character are properly converted in the PDF-file.

So the problem seems to be linked to the font "Liberation Sans".


Reproducible: Always


User Profile Reset: Yes

Additional Info:
Version: 25.8.4.2 (X86_64)
Build ID: 290daaa01b999472f0c7a3890eb6a550fd74c6df
CPU threads: 4; OS: Windows 11 X86_64 (build 26200); UI render: Skia/Raster; VCL: win
Locale: de-DE (de_DE); UI: de-DE
Calc: threaded
Comment 1 m_a_riosv 2026-01-21 15:03:18 UTC
Please attach a sample file(s), reduce the size as much as possible without private information, and paste in the answer the information in Menu/Help/About LibreOffice, there is a copy icon.
Comment 2 m_a_riosv 2026-01-21 22:07:13 UTC
Created attachment 205120 [details]
Screenshot with Adobe reader.

>2 files attached (original odt-file and pdf-file produced by pdf export)).
>
>here the requested information version information:
>
>Version: 25.8.4.2 (X86_64)
>Build ID: 290daaa01b999472f0c7a3890eb6a550fd74c6df
>CPU threads: 4; OS: Windows 11 X86_64 (build 26200); UI render: Skia/Raster; >VCL: win
>Locale: de-DE (de_DE); UI: de-DE
>Calc: threaded


Please answer here, don't send private emails. Over the first comment, there is a link to attach documents.

Not reproducible
Version: 25.8.4.2 (X86_64)
Build ID: 290daaa01b999472f0c7a3890eb6a550fd74c6df
CPU threads: 16; OS: Windows 11 X86_64 (build 26200); UI render: Skia/Raster; VCL: win
Locale: en-GB (es_ES); UI: en-US
Calc: threaded
Comment 3 Stephan 2026-01-22 12:35:34 UTC
Created attachment 205134 [details]
This file is the writer document *.odt

In the source file (*.odt) every umlaut has the proper small dots above the normal character.
like ä,ö,ü, Ä,Ö,Ü
Comment 4 Stephan 2026-01-22 12:41:03 UTC
Created attachment 205135 [details]
PDF output by libreoffice of the *.odt file

You have to compare carefully the *.odt file and the *.pdf output.

For the font Liberation Sans in BOLD you see the umlaut dots ONLY at "Ä", the umlaut dots are missing at O (should be Ö!), U (should be Ü!), a (should be ä), o (should be ö), u (should be ü).

And this problem occurs only at BOLD typeface; at "normal" typeface the umlaut dots are correctly displayed.
Comment 5 Stephan 2026-01-22 12:58:52 UTC
Sorry, to have bothered you.

It seems that the reported problem is a problem of my standard pdf viewer (pdfxchange viewer 2.5 (build 322.10)).

when I use a different pdf viewer also at my PC all characters are properly displayed in the PDF file that was generated by libreoffice from the ODT file.