Acrobat无法打开社保缴费凭证，无法预览！！！

Hi @xushaohua

Sorry for the delayed response. 

If fonts are not embedded in a PDF and you try to view the document, several issues can arise depending on the viewer, the system fonts available, and the PDF settings. Here are some possible outcomes:

1. Font Substitution

• If the font used in the PDF is not available on the system, the PDF viewer will substitute it with a similar one.
• This may alter the appearance of the text, affecting readability, alignment, and spacing.

2. Formatting Issues

• The substituted font may have different character widths, leading to text misalignment, wrapping issues, or overlapping text.
• Tables, charts, and forms may appear distorted if text expands or contracts unexpectedly.

3. Missing or Garbled Text

• Some characters may appear as blank spaces or incorrect symbols if the system lacks a proper substitution font.
• Special characters, symbols, or non-Latin scripts might be completely unreadable.

4. Printing Errors

• If the printer does not have the required font, text may print incorrectly, be substituted, or be missing.
• Rasterized printing (where the document is converted to an image) may occur, reducing text clarity.

5. Search and Copy Issues

• If the substituted font does not match the original encoding, searching for text may fail.
• Copy-pasting text from the PDF may produce garbled or incorrect characters.

6. Compliance and Accessibility Issues

• Many industries require fonts to be embedded for compliance (e.g., legal, archival, accessibility standards).
• PDFs without embedded fonts may not meet accessibility guidelines (e.g., WCAG, PDF/UA).

Best Practice: Always Embed Fonts

To avoid these issues, ensure fonts are embedded when creating a PDF, especially if sharing or printing across different systems. In Adobe Acrobat, you can check this via File > Properties > Fonts to see if fonts are embedded or substituted.

Embed Fonts During PDF Conversion:

Using Adobe Acrobat:

• In Microsoft Word, navigate to the “Acrobat” tab.
• Click on “Preferences.”
• Select the desired “Conversion Settings” profile and then click on “Advanced Settings.”
• Go to the “Fonts” section and ensure that “Embed all fonts” is checked.
• If necessary, save this profile under a new name and use it for your conversions.