Why Adding Comments Increases PDF File Size and How to Fix It
Question details
Users experience a significant increase in PDF file size after adding text-box comments, often caused by embedded font data that remains even if the comments are later deleted.
- Product
- PDF Editors
- Device & OS
- not provided
- Scenario
- Adding text-box annotations, comments, or typewriter text to a PDF document.
- Observed behavior
- The PDF file size substantially increases due to font embedding. The file bloat persists even after the user removes the previously added text-box comments.
Before addressing the file size issue, review your PDF's text-box properties to identify if non-standard fonts (like Arial or custom typefaces) were used in recent annotations.
Use Standard Fonts to Prevent File Size Bloat
Switching to standard fonts prevents the PDF editor from embedding large custom font files into the document.
When you use non-standard fonts in your comments, the PDF software embeds the entire font file to ensure it displays correctly on other devices. Standard fonts are natively supported by most PDF readers and do not require embedding, keeping the file size compact.
Open your PDF and select the text-box or typewriter tool to begin adding your comment.
In the text formatting properties panel, change the font to a standard option such as Helvetica, Times Roman, or Courier.
Save your changes. Notice that the resulting file size remains much smaller compared to using custom fonts.
Optimize and Compress the PDF Document
If the file size has already increased, you can optimize the PDF to strip out unneeded embedded font data.
Easily Add Comments and Compress PDFs with WPS Office
WPS Office provides a comprehensive built-in PDF editor that allows you to efficiently add comments using standard lightweight fonts, and offers a one-click compression tool to reduce large PDF files without losing quality.
- 1. Open your PDF: Launch WPS Office and open your PDF document.
- 2. Add Comments: Navigate to the 'Comment' tab to add text boxes, ensuring you select standard fonts like Helvetica or Courier in the text properties.
- 3. Compress the File: If the file becomes too large, click on 'Tools' and select 'Compress' to instantly optimize and reduce the document's size.
Frequently Asked Questions
Why does deleting a PDF comment not reduce the file size?
When a comment uses a custom font, the font file is embedded into the PDF structure. Simply deleting the text box often leaves the embedded font data behind in the document's hidden resources. You must use an optimize tool or select 'Save As' to clear this unused data.
Which fonts should I use to keep PDF file sizes small?
Standard fonts like Helvetica, Courier, and Times Roman are highly recommended. These are typically built into all standard PDF readers, meaning the font data doesn't need to be embedded in the file itself, saving megabytes of space.
Can I permanently remove embedded fonts from an existing PDF?
Yes, by using a PDF compression or optimization tool. These tools scan the document for unused elements, metadata, and embedded fonts, stripping them out to significantly reduce the overall file size.
