Some characters shows as box, but when open no error shows in illustrator

[ZHENYU234595446ioh]

I have a pdf file, which can be opened in AdobeReader, but can't be opened in Illustrator for some characters are shown as boxes.

When I opened this file in Illustrator, no reminder showed. How can I make Illustrator show these characters?

Thanks.

[Ton Frederiks]

It is not recomended to use Illustrator as PDF editor for PDF files that were not created with Illustrator.

In your example the font could be missing or re-encoded.

You could try to place the PDF linked and use Object > Flatten Transparency with Convert Text to Outlines

[ZHENYU234595446ioh]

I see in Acrobat, the Framed Boxes are Symbol Font. But I chose Symbol Font in Illustrator, it showed Framed Boxes too. Is there a way to solve this problem? I don't want to convert text to outlines.

[Monika Gause]

Try the "Protected glyph" setting in the Illustrator preferences. If that does not help, then outline.

[ZHENYU234595446ioh]

Hello,

I have enabled missing protected glygh. However, it is no use. When I unclicked the missing protected glygh, it is still the same. Are there other ways to solve this problem?

[Monika Gause]

Outline the text as Ton described.

[ZHENYU234595446ioh]

After outlining the text, there are still boxes.

[Ton Frederiks]

Did you place the file as linked and use Flatten Transparency?

[ZHENYU234595446ioh]

I did as he told me and now the problem has been solved. Thanks a lot. I want to find a way to correct the boxes not to Flatten Transparency.

[Monika Gause]

You have to do it exactly as described by Ton.

PLace and link the PDF in a new Illustrator file. Then flatten transparency.

[ZHENYU234595446ioh]

I did as he told me and now the problem has been solved. Thanks a lot. I want to find a way to correct the boxes not to Flatten Transparency. Is there a way?

[Jason5C88]

Why would you tell them it's not recommended?  It's completely recommended.  I disassemble and reassemble PDF files all the time in Illustrator.  It's very rare fonts come up like this when opening a PDF.  I honestly have only encountered it a hand full of times but it has never affected my work flow.  

[Monika Gause]

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@Jason5C88  schrieb:

Why would you tell them it's not recommended?    

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Because every PDF expert on the planet will tell you so:

https://prepression.blogspot.com/2014/09/the-ten-commandments-of-pdf.html 

"Expert" referring to the people who have made the file format.