Embedding Fonts in PDFs: Why and How

Font embedding is one of the most important yet overlooked aspects of PDF creation. When fonts aren't properly embedded, your carefully designed document can look completely different on another computer. This guide explains why font embedding matters and how to ensure your PDFs display correctly everywhere.

Why Font Embedding Matters

When you create a PDF, the text uses specific fonts. If those fonts aren't embedded in the PDF, the viewing computer must have the same fonts installed. If not, the PDF viewer substitutes different fonts, often with poor results.

What Happens Without Embedded Fonts

Text reflows: Different fonts have different character widths, causing text to shift
Layout breaks: Columns may misalign, text may overflow boxes
Missing characters: Special symbols or characters may display as boxes or question marks
Wrong appearance: Substituted fonts may look completely different from the original
Professional impression: Documents may appear unprofessional or poorly formatted

When Font Embedding Is Critical

Legal documents: Must display exactly as intended
Contracts: Formatting changes could create ambiguity
Print materials: Printers need exact fonts for reproduction
Branding materials: Corporate fonts must display correctly
Forms: Field positions depend on exact font metrics
International documents: Non-Latin scripts especially vulnerable

Understanding Font Embedding Options

Embedding Type	Description	File Size Impact	Best For
Full Embedding	Entire font file included	Largest	Editable PDFs
Subset Embedding	Only used characters included	Moderate	Most documents
No Embedding	Font referenced by name only	Smallest	Not recommended
ToUnicode Mapping	Character mapping for search/copy	Minimal addition	Searchable PDFs

Full Font Embedding

The entire font file is included in the PDF.

Pros: PDF can be edited; all characters available
Cons: Larger file size; may violate font licensing
Use when: Recipients need to edit the PDF

Font Subsetting

Only the characters actually used in the document are embedded.

Pros: Smaller file size; better license compliance
Cons: Can't add new text with that font
Use when: Document is final and won't be edited

How to Embed Fonts: By Application

Microsoft Word

Go to File > Options > Save
Check "Embed fonts in the file"
Options:
- "Embed only the characters used" = Subsetting
- "Do not embed common system fonts" = Reduces size
Save as PDF or use Print to PDF

Adobe Acrobat

Go to File > Properties > Fonts tab
View which fonts are embedded (shown as "Embedded" or "Embedded Subset")
For PDF creation: Edit > Preferences > Convert to PDF
Select source application and click "Edit Settings"
Under Fonts, ensure "Embed all fonts" is checked

Adobe InDesign

Go to File > Export > Adobe PDF
Choose PDF preset or customize
In Advanced tab, set "Subset fonts when percent of characters used is less than"
Set to 100% to always subset, 0% to fully embed

Google Docs

When downloading as PDF:

Google Docs automatically embeds web fonts
Standard fonts (Arial, Times) are usually embedded
Custom fonts may not embed properly
For best results, use common fonts or Google Fonts

LibreOffice

Go to File > Export as PDF
In the PDF Options dialog, click General tab
Check "Embed standard fonts" if available
LibreOffice typically embeds fonts by default

Checking If Fonts Are Embedded

In Adobe Acrobat Reader

Open the PDF
Go to File > Properties
Click the Fonts tab
View list of fonts used:
- "Embedded" = Full font embedded
- "Embedded Subset" = Subset embedded
- No label = Font not embedded (problem!)

Using Command Line (Poppler)

Use pdffonts command:

Shows all fonts in the PDF
"emb" column shows if embedded (yes/no)
"sub" column shows if subsetted

Font Licensing Considerations

Understanding Font Licenses

Not all fonts can be legally embedded in PDFs:

Editable embedding allowed: Full embedding permitted
Print & Preview only: Embedding allowed for viewing/printing only
No embedding: Cannot legally embed in PDFs
Restricted license: May require additional licensing

Safe Font Choices

System fonts: Arial, Times New Roman, Verdana (usually safe)
Google Fonts: Open source, free to embed
Adobe Fonts: Check Creative Cloud license terms
Purchased fonts: Review EULA for embedding rights

Checking Font Permissions

In Windows:

Open Font folder (C:\Windows\Fonts)
Right-click font > Properties > Details
Look for "Font embeddability" property

Common Font Embedding Problems

Problem: Font Shows as "Not Embedded"

Cause: PDF creation settings didn't include embedding
Fix: Recreate PDF with embedding enabled
Workaround: Print to new PDF using PDF printer

Problem: Font Licensing Prevents Embedding

Cause: Font license restricts embedding
Fix: Use a different font with permissive license
Alternative: Convert text to outlines (for print only)

Problem: File Size Too Large

Cause: Full fonts embedded instead of subsets
Fix: Use subset embedding
Check: Multiple weights of same font family may each be embedded

Problem: Asian/Complex Script Fonts

Cause: CJK fonts can be very large (10-20MB each)
Fix: Always use subsetting for CJK fonts
Note: Some PDF standards require specific CJK font handling

Best Practices for Font Embedding

Before Creating PDFs

Use fonts you have license to embed
Limit number of different fonts (reduces file size)
Consider using standard fonts for maximum compatibility
Verify font files aren't corrupted

During PDF Creation

Always enable font embedding in export settings
Use subsetting unless editing capability needed
Set appropriate subsetting threshold (typically 100%)
Include ToUnicode mapping for searchability

After Creating PDFs

Verify fonts are embedded (check Properties > Fonts)
Test on different computers and PDF viewers
Check file size is reasonable
Verify text is searchable and copyable

PDF/A and Font Requirements

PDF/A-1 Requirements

All fonts must be embedded
Fonts must include ToUnicode mapping
All glyphs must be present in embedded fonts
No font substitution allowed

PDF/A-2 and PDF/A-3

Same embedding requirements as PDF/A-1
Allows OpenType fonts
Better Unicode support

Why PDF/A Matters

Ensures long-term document preservation
Guarantees consistent rendering forever
Required for legal and archival purposes
Eliminates font-related display issues

Converting Text to Outlines

An alternative to font embedding for specific use cases:

What It Does

Converts text characters to vector shapes
No font data needed (completely self-contained)
Appearance preserved exactly

Advantages

No font licensing issues
Guaranteed identical appearance
Works with any font

Disadvantages

Text is no longer searchable
Cannot copy/paste text
File size may increase
Accessibility features lost

When to Use

Final print-ready artwork
Logos and headers
When font can't be embedded legally
Never for body text in documents needing accessibility

Troubleshooting Font Display Issues

Text Appears as Boxes or Symbols

Check if font is embedded (Properties > Fonts)
If not embedded, recreate PDF with embedding
If embedded, font file may be corrupted
Try converting to PDF/A which requires valid fonts

Wrong Font Displayed

Verify intended font is embedded
Check for font name conflicts
Test on different PDF viewers
Recreate with proper font embedding settings

Text Not Copyable

Font may be missing ToUnicode mapping
Recreate PDF with proper encoding settings
Use OCR to add text layer if needed

Conclusion

Font embedding is essential for creating PDFs that display correctly on any device. Always embed fonts (preferably as subsets) to ensure your documents maintain their intended appearance. Check font licenses before embedding, verify embedding after PDF creation, and consider PDF/A format for documents requiring long-term reliability. Use our PDF tools to convert and optimize your documents while maintaining proper font handling.