Fix PDF File Size Increase When Adding Comments in Acrobat
Question details
The user is experiencing a significant increase in PDF file size when adding simple text comments.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Adding text boxes, annotations, or simple comments to an existing PDF document.
- Observed behavior
- The file size balloons from a few hundred kilobytes to over a megabyte due to fully embedded nonstandard fonts.
Before proceeding, check if you are using specific custom fonts for your text boxes, as fully embedding nonstandard fonts is the most common cause of sudden file size bloat in PDFs.
Audit Space Usage to Identify Embedded Fonts
Use Acrobat's built-in audit tool to analyze what elements are consuming the most space, such as embedded fonts from comments.
When you add a text box or comment using certain fonts (like Arial), the PDF editor may fully embed that font into the document to ensure it displays correctly on other devices. This can add 1,000 KB or more to a very small document.
Go to the 'Tools' menu in Adobe Acrobat, select 'Optimize PDF', and choose 'Advanced Optimization'.
Click the 'Audit space usage' button in the top right corner of the dialog box.
Review the report, paying close attention to the 'Fonts' percentage. If fonts take up the majority of the file size, a nonstandard font in your comments is likely the culprit.
Change Default Comment Font to a Standard Font
Switch your comment font to a standard Base-14 font like Helvetica, which doesn't require full embedding.
Use 'Save As' Instead of 'Save'
Clear out incremental save bloat by rewriting the entire document.
Add PDF Comments Efficiently with WPS Office
WPS Office offers a lightweight PDF editor that optimizes file size automatically when adding annotations, comments, and text boxes, avoiding unnecessary font bloat.
- 1. Open your PDF in WPS Office: Launch WPS Office and open the PDF document you wish to edit.
- 2. Navigate to the Comment tab: Click on the 'Comment' tab on the top ribbon to access the annotation tools.
- 3. Add Text Boxes and Notes: Select 'Text Box' or 'Note' and click anywhere on the document to add your comments using optimized system fonts.
- 4. Save the Optimized Document: Click 'Save'. WPS Office handles embedded resources efficiently to prevent unexpected file size increases.
Frequently Asked Questions
Why does Arial increase PDF file size more than Helvetica?
Helvetica is one of the standard Base-14 PDF fonts. PDF readers are expected to render it natively, so it rarely needs to be fully embedded. Arial, while common, may be fully embedded into the document by the PDF editor to ensure exact cross-platform rendering, which drastically increases the file size.
Does using 'Save As' really reduce PDF file size?
Yes. When you use the standard 'Save' command, the software simply appends the new data to the end of the file (incremental saving). 'Save As' forces the software to rewrite the entire document structure, which eliminates unnecessary appended data and can reduce the file size.
How can I completely remove embedded fonts from a PDF?
You can remove embedded fonts using Acrobat's 'Optimize PDF' tool. Under 'Advanced Optimization', go to the 'Fonts' tab, select the fully embedded font, and click 'Unembed'. Be aware that unembedding nonstandard fonts may change how the document looks on devices that don't have that specific font installed.
