Optimising PDF files, manual font removal

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Christian Flatscher
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Optimising PDF files, manual font removal

Post by Christian Flatscher » Thu Jan 24, 2019 4:33 pm

Hi,

Last week Saturday I sent an e-mail to support - support@tracker-software.com - but unfortuantely to date not received a reply or acknowledgement of my mail. :(

Here again my problem report:


I am creating PDF files with LibreOffice writer. Unfortunately there is a bug in LibreOffice writer that leads to fonts being embedded that are actually not in the source file. See these bugs:

https://bugs.documentfoundation.org/sho ... ?id=122657
( Bug 122657 - Converting .odt file to PDF contains fonts that are not in the .odf file )

and

https://bugs.documentfoundation.org/sho ... ?id=118541
( Bug 118541 - Undesired font embedded in pdf form created with Libre Office Writer )

It seems that it the LO people do not know how to remove these fonts from the ODT file. Details are in bug #122657.

I thought I can achieve this by using PDF XChange Editor. But it appears that this is not possbile when saving the file as optimised. See attached video file and sample files.

Please let me know to why this is the case and how I can remove unwanted fonts from a PDF file created by LibreOffice.

Thank you!

Some additional information:

unembed_fonts_problem.zip - contains two pdf files and a LibreOffice writer file
pdf_font_remove.rar.zsp.rar and pdf_font_remove.rar.1.rar - contain a demo .mp4 video of the issue requires unsplit_script.zip
unsplit_script.zip - contains a script file to rebuild the original pdf_font_remove.rar which contains the .mp4 video file


BTW - I converted a MS PPTX file with PDF-Xchange and see the same as with a LO document.

Please advise / help on how I can unembedded non-existing fonts from a PDF file.

Thank you.

Regards,

--Christian
Attachments
unsplit_script.zip
(313 Bytes) Downloaded 5 times
pdf_font_remove.rar.zsp.rar
(4.77 MiB) Downloaded 7 times
pdf_font_remove.rar.1.rar
(3.02 MiB) Downloaded 8 times
unembed_fonts_problem.zip
(1.52 MiB) Downloaded 6 times

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Thu Jan 24, 2019 10:40 pm

Hello Christian,

Terribly sorry for the missed communication, we have found your email and are looking into why it did not get a reply in the usual timeframe. We will also be taking further steps to avoid this happening again in the future.

Moving on to the issue at hand. As LibreOffice is causing issues by leaving non-existent fonts in the document, could I ask if you have tried using our Lite printer to handle the conversion?
It offers Font control options, and the ability to embed only used fonts, (or even only subsets of those) at your discretion. When printing from any application, simply choose the Lite printer and click printer properties, then navigate to the Fonts Category:
image.png
As for unembedding afterwards, It looks from my end like the PDF files do only have the 16 used fonts embedded in them (one file does have 17 fonts). I am not sure why our optimization is unable to see these to offer the unembed function, but I do not see any that are not used.

Please let us know if using our lite printer offers a better solution.
Daniel McIntyre
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Tracker Software Products (Canada) LTD

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Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Fri Jan 25, 2019 5:05 pm

Thank you for your prompt reply and e-mail, Daniel.

I was thinking my mail did not go through because of the size of the attachments and the fact that it contains an .mp4 file.


I am copying your last reply from your e-mail into this post for completeness sake:


"On to the topic at hand, thank you very much for links to the LibreOffice bug reports, they have helped us to sort through the issue a bit more. Upon testing in house, we do see that the conversion is handled incorrectly from their end, but I am afraid that there is nothing much we can do in that case.

"The cause from what we see, is how the fonts are being embedded by LibreOffice. Usually when a font is embedded, each character is given an identifier that tells the document which steps to use to find the visual of the character. In this case, LibreOffice has embedded the fonts as "built in" fonts, meaning that there is no identifier with steps, it simply contains the visual directly. This in turn means that we cannot unembed the font, as if we did there would be no reference for these characters and they would instantly become broken text. I am afraid that this means no matter how we process it, there will be some fonts that cannot be removed from this document.

There is good news however, As in my earlier forum post, it is possible to get much better results by using our Lite printer for the conversion, which gives you more control over the font handling, and takes the control away from LibreOffice. When Printing to our printer, a file of similar size is created, however half of the embedded fonts are able to be unembedded with our optimize function. This in turn created a file that is less than half the size in my tests, with the default settings, and "unembed recommended fonts" selected."


Unfortunately I do not have the PDF-XChange Light Printer installed but the PDF-XChange Standard Printer driver. See 01.png. Therefore my settings are slightly different from yours - see 02.png. I am not so keen to use this function because it appears that LbireOffce Writer pulls any random font into the .odt file.

What I find rather strange is that when I create a PDF file via this printer the resulting PDF file is around 53 MB in size. So not really an improvement. When I then open up that PDF file in the PDF XChange Editor it takes a quite a long time to load. I can then optimise the file. When clicking on "Fonts" it gathers the fonts embedded in the PDF - see 03.png. However again the software does not recognise any font at all! See 04.png. This is rather strange. Why is the file size all of a sudden so big, even after I chose PDF v1.6? Why does the application not recongise any fonts and how can I resolve this?

My current installation of PDFXChange Pro was done via the integrated update mechanism - which appears to have caused some changes which are for me not very pleasant. The measurement is now in imperial ( pixel / inch ) rather than metric. See 05.png.

There is indeed a reason to why I do not use any PDF printer software - which also includes the PDFXChange printer:

When using such a software it does not create any bookmarks in the resulting PDF file. As I write a lot of technical documentations for my company's customers I have no choice but to use the LibreOffice integrated PDF generator as adding bookmarks manually is a very tedious task. I would be very happy if there was a stand alone or LibreOffice plug in version of PDFXchange that would work in LibreOffice Writer and the other apps just like the MS Office integrated PDFXChange. This would help me greatly.

For a test I have also activated the automatic book generation but to no effect. See also 06.png.

Due to the file size limitations of 5 MB in this forum I will e-mail you the PDF file.

Thank you very much for your help.

Regards,

--Christian
Attachments
06.png
05.png
04.png
03.png
02.png
01.png

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Fri Jan 25, 2019 6:03 pm

Hello Christian,

The Standard printer and Lite printer handle the Font options in exactly the same way, so that should not be an issue, simply having only the "Embed all used fonts" and "embed a font subset only..." options, you should end up with a smaller file. I am unsure what you mean by:
Christian Flatscher wrote:
Fri Jan 25, 2019 5:05 pm
I am not so keen to use this function because it appears that LbireOffce Writer pulls any random font into the .odt file.
If Libre is adding random fonts to the files, would this not be more reason to avoid using it for conversion?
Christian Flatscher wrote:
Fri Jan 25, 2019 5:05 pm
What I find rather strange is that when I create a PDF file via this printer the resulting PDF file is around 53 MB in size. So not really an improvement. When I then open up that PDF file in the PDF XChange Editor it takes a quite a long time to load. I can then optimise the file. When clicking on "Fonts" it gathers the fonts embedded in the PDF - see 03.png. However again the software does not recognise any font at all!
Is this (53MB) in comparison to the 1MB file that you sent us as a sample? if not how large is the ODT file, and the PDF that LibreOffice creates from it? I only ask because if it is growing 53x in size, there s certainly something wrong, but if it is a comparison of 51mb to 53mb, it would be within acceptable limits.
As for how long it takes to load, does the load time improve after optimizing, and how long does the LibreOffice version take to load. Finally, how long does it take to load if you create the file with the Standard printer using the font settings I recommended above?
The fonts are likely not seen because as you selected earlier in the print options, they have been force embedded. This does not always happen, but it can on occasion be the case. Please try with the settings recommended above and let me know if these fonts are manageable by the optimize function.
Christian Flatscher wrote:
Fri Jan 25, 2019 5:05 pm
My current installation of PDFXChange Pro was done via the integrated update mechanism - which appears to have caused some changes which are for me not very pleasant. The measurement is now in imperial ( pixel / inch ) rather than metric.
Apologies for this sometimes during an update some of the settings can be reset, typically this only happens if you use a registry cleaner, or have updated between major version (IE V6 to V7). You can fix this setting in the Editor from the preferences (Ctrl+K) under measurement:
image.png
Christian Flatscher wrote:
Fri Jan 25, 2019 5:05 pm
When using such a software it does not create any bookmarks in the resulting PDF file. As I write a lot of technical documentations for my company's customers I have no choice but to use the LibreOffice integrated PDF generator as adding bookmarks manually is a very tedious task. I would be very happy if there was a stand alone or LibreOffice plug in version of PDFXchange that would work in LibreOffice Writer and the other apps just like the MS Office integrated PDFXChange. This would help me greatly.
Currently we do not have plans to create an addin for the LibreOffice suite, but if there is enough demand I an sure we would consider it.
Christian Flatscher wrote:
Fri Jan 25, 2019 5:05 pm
For a test I have also activated the automatic book generation but to no effect.
When using automatic bookmark detection, some parameters must be set. After checking "Enable automatic Bookmark Detection" the rest of the options will light up, and you can see the window below has "add" and "remove buttons. You will need to add a criteria for these bookmarks, as an example, maybe all of your bookmarks are 14pt comic sans bold, which the rest of the text is 12pt times new roman. In this case you would specify the font and font size for the bookmark to be generated from. You can add multiple criteria to catch all the needed bookmarks.

I am still unable to see your email in our inbox, So it seems likely that your earlier suspicion was correct and it bounced due to the file size. If after testing the above, you find that it is still generating unreasonably large files, you can upload a sample of these larger files to our useruploads server.
Daniel McIntyre
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Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
Fax: +1 (250) 324-1623

Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Sun Jan 27, 2019 6:45 pm

Hi Daniel,

What I mean with this statement:

" I am not so keen to use this function because it appears that LbireOffce Writer pulls any random font into the .odt file."

is that LibreOffice itself already before creating any PDF file seems to pull in some random font files - see my bug report per https://bugs.documentfoundation.org/sho ... ?id=122657 - before actually creating the PDF file. So a random font is added at some point to the source .odt file.

I did some thorough investigations and found that the PDF-XChange PRO v7 - most likely all releases - are buggy. What I found is that when I convert a MS Office 2016 document - be it Word or PowerPoint - into PDF then in the resulting .PDF I can not remove any fonts when trying to optimise a PDF file.

I found that depending on the LibreOffice version (5 or 6) the resulting PDF file when creating it with the PDFXChanger Printer Standard can be anything between 50 to 60 MB. If I save in LibreOffice the .odt file as .docx and open it in Word and use PDFXChange Printer the resulting PDF file is also around 50 MB. This initially led me to believe that there is an issue with LibreOffice. I continued my tests.

When using PDF24 from https://en.pdf24.org/ or Nitro PDF 12 Pro the resulting PDF files are no larger than 2 MB. Unfortunately I can not remove any fonts from PDF files created by either Nitro or PDF24 when using the PDFXchange Editor and trying to optimise the PDF file.

I also set up a Windows 10 Pro Virtual machine and then I tested PDF-XChange PRO v7 and v6. I found that the size of a PDF file with v6 is around 2 MB and I can remove fonts that I do not want to be in the PDF file.

Conclusion:

It is very much likely that PDF-XChange PRO v7 is buggy.

I have attached these files:

0.zip
1.zip
2.zip
3.zip
4.zip
5.zip
6.zip
7.zip
8.zip

These are actually not zip files. Please unpack the file UNSPLIT.zip and run the batch file. It will unpack 3 .MP4 videos showing how I came to my test results.

Please discuss this issue with your developers and have the problem investigated and solved.

In the mean time I will continue with a few more tests and let you know my findings in due course.

Thank you.

--Christian

Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Sun Jan 27, 2019 7:47 pm

Hi Daniel,

Just tested with the same Windows 10 VM and LibreOffice v5 and PDF-XChange PRO v6. The result is as expected and perfectly fine.

This proofs to me beyond any doubt that the issue lies only with PDF-XChange PRO v7.

Please have this issue resolved.

I have attached these files:

00.zip
01.zip

These are not zip files. Unpack the file unsplit2.zip and run the batch file in order to unpack the .MP4 video that confirms that the issue does not exist with PDF-XChange PRO v6 and LibreOffice 5.

Thank you for resolving this issue.

--Christian

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Tue Jan 29, 2019 12:17 am

Hello Christian,

Thank you for uploading the files, however due to our security policies we first tested these in a secured environment and found that the first set of files created a file the bluescreened our test machine. I have thus removed all copies of these files from your posts as a precaution. We will not be attempting to investigate those files any further.

Please zip and upload the original MP4, and the larger (50mb) ODT/PDF files to our USERUPLOADS server as I had requested earlier. This file sharing will be able to handle the full sized files without issue and without splitting the files into fragmented pieces.

Once we have these files we will investigate the issue directly. While I cannot agree that this "proves beyond a doubt" our V7 is the cause of the issue, I do agree that it sounds more likely after those tests. I am curious to see what other variables we can fiddle with to make this better for you.
Thank you!
Daniel McIntyre
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Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
Fax: +1 (250) 324-1623

Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Tue Jan 29, 2019 1:15 pm

Hi Daniel,

I have uploaded the file 2019-01-27.zip to the server as requested.

Thank you for your help.

Christian

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Tue Jan 29, 2019 6:34 pm

Hello Christian,

Thank you for the videos, I will still need you to send us the ODT file that generated the 52mb PDF, and both versions of the output PDF's from v6 and v7. We will need these to compare, test and find the actual cause of the issue.

Kind regards,
Daniel McIntyre
Support Technician
Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
Fax: +1 (250) 324-1623

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Tue Jan 29, 2019 8:13 pm

I have been testing with the original "safety" file you provided for us earlier, but in all my tests, ensuring that I have the same settings as in your videos, the output file has been 1mb in both V6 and V7, making no alterations to anything other than the settings you selected. LibreOffice is a fresh installation, and I've rolled back to v6 build 322.7 in this instance.

Can I ask that you create a printer profile from your V6 and V7 settings, then use the "Export to file" option that our printers offer to send us a copy of the printer settings you are using. nonetheless, we will still need the original files that generate the large document.

Regards,
Daniel McIntyre
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Tracker Software Products (Canada) LTD

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Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Wed Jan 30, 2019 7:49 am

Hi Daniel,

I have uploaded the file

2019-01-30_bug_#32093.zip

to the Tracker server.

It contains the printer configuration files, the LibreOffice Writer file, and all font files in use in that file.

It would be interesting to try your settings on my computer for both v6 and v7 of the PDF Tools.

Thanks!

--Christian

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Wed Jan 30, 2019 7:42 pm

Hello Christian,

Thank you for the original file, preferences and your fonts.
Even with these items in place, testing with your v7 printer profile, manually changing the settings to what you displayed in the earlier video, and by using the settings I recommended above, I still ended up with a file that is almost exactly the same size as the V6 printer.

As I have asked for multiple times already, we will need the output PDF file that has an excessively bloated size on your end. Please send that so we can dig into it and hopefully find the cause of this.

I should also note that the extensive load times you are seeing whenever opening the "fonts" sections of our driver and optimize function is very likely die to the extensive font library you have in place, or possibly (less likely), an error in one or more of those fonts is causing it to have a heavier load than it should.

As for my printer settings, They are the defaults on a fresh installation, unless I am mimicking exactly what you have changed in your videos. So surely enough when I export I have an identical file to your settings, no need to try that anymore.

Please send the output PDF files from V6 and V7 so that we can compare the differences and find out what is going on. Thank you for your cooperation.
Daniel McIntyre
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Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
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Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Thu Jan 31, 2019 7:31 am

Hello Daniel,

pdf_files.rar has been uploaded.

--Christian

Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Thu Jan 31, 2019 9:25 am

Added also the file pdf_win10_virtual.rar.

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Thu Jan 31, 2019 6:52 pm

Thank you Christian,

We are looking into the files with the dev team now and hopefully can figure out what the root cause is from this. I will let you know if we need any more from you in the meantime.

Kind regards,
Daniel McIntyre
Support Technician
Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
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Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Fri Feb 01, 2019 6:46 am

Thank you very much, Daniel.

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Fri Feb 01, 2019 6:24 pm

Hello Christian,

It does indeed seem to be cause by some font "bloat" for lack of a better term. The Devs have asked if you can provide printer tmp files from the V7 printer (please sure you are using build 328.2 for this test). This Article details the creation of printer tmp files: https://www.tracker-software.com/knowle ... -I-do-this
This will help us to discern why the files created seem to have more of the font embedded than necessary, and why in this case the resulting file is so much larger than V6.

Thank you!
Daniel McIntyre
Support Technician
Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
Fax: +1 (250) 324-1623

Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Sat Feb 02, 2019 9:05 am

Hi Daniel,

I have uploaded the file bug_#32093_pxp4780.zip.

Regards,

--Christian

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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Tue Feb 05, 2019 12:19 am

Hello Christian,

Thank you for the tmp files. Our devs now see the issue and are looking into ways to prevent the file bloat in V7 from happening in the future. Dues to the nature and complexity of this, I cannot guarantee a timeline or an immediate fix, we will be working on this over time, so you will likely see gradual improvements over a few builds in the future.
For reference, the development ticket regarding this is RT #4642. You can ask any member of our support team for an update on the progress as time goes on.

Regarding being able to remove the fonts when using the optimize function. As I have mentioned before, in some instances fonts are embedded in a way that makes it impossible to remove them. This will not change as there is no fix to be made or special rules we can apply, it is intended to work this way and we cannot alter it. Any fonts that can be removed, will be available for removal here, any other fonts that are visible in the document properties are embedded this way.

Kind regards,
Daniel McIntyre
Support Technician
Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
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Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Tue Feb 05, 2019 10:56 am

Thank you, Daniel.

I understand that fonts can not be removed when they are in the way that LibreOffice does. But when I use PDF Tools Pro v6 I can select fonts to be removed.

I will also add your statement with respect how fonts are embedded into the LibreOffice forum.

Thank you again for your support.

Regards,

--Christian

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Tue Feb 05, 2019 7:41 pm

Absolutely, that is included in the issue that we are investigating from the files you have sent us earlier. So now we simply need to wait patiently as the dev team works on it.

I am glad that we could work together on this and hope that it pays off soon.

Until next time!
Daniel McIntyre
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Tracker Software Products (Canada) LTD

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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Wed Feb 06, 2019 5:59 am

Many thanks, Daniel.

Is there anything that Tracker Software can give me with respect to correctly embedding fonts into PDF files?

I am not interested in any kind of source code but more like a public, free available documentation that explains how to do this. I googled this subject but I am not sure if the references I found are correct:

https://www.karlrupp.net/2016/01/embed- ... -pdflatex/

https://stackoverflow.com/questions/226 ... with-tcpdf

https://tcpdf.org/

Once I have this information I will open up a bug with the Libre Office team.

Thank you.

Regards,

--Christian

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Wed Feb 06, 2019 6:22 pm

Hello Christian,

With regards to how they are handled in PDF, we base everything off the ISO Standard: https://www.iso.org/standard/51502.html
Far from free or public documentation, but it is what should be used by anyone who even remotely handles PDF documents.

I should note that I personally do not have access to the documentation, so I cannot provide a passage or page number that might be helpful either. Beyond that, I am afraid that I do not have any further information to share.

Kind regards,
Daniel McIntyre
Support Technician
Tracker Software Products (Canada) LTD

Sales: +1 (250) 324-1621
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Christian Flatscher
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Re: Optimising PDF files, manual font removal

Post by Christian Flatscher » Thu Feb 07, 2019 4:40 am

Many thanks, Daniel!

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TrackerSupp-Daniel
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Re: Optimising PDF files, manual font removal

Post by TrackerSupp-Daniel » Thu Feb 07, 2019 11:15 pm

:D
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