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View storage space used by different elements in PDFs

Last updated on Sep 23, 2025

Learn how to review the space used by different elements in a PDF file using the audit space feature.

The Audit space usage feature in Adobe Acrobat shows how much space different PDF elements, like text, images, fonts, forms, and comments, are using. It lists the size of each element in bytes and as a percentage of the total file size. This helps you see what’s taking up the most space to reduce the file size and make your PDF work better for your needs.

Windows

Select Menu > Save as Other > Optimized PDF.

In the dialog box that opens, select Audit space usage.

Review the space usage report.

Select OK.

macOS

Select File > Save as Other > Optimized PDF.

In the dialog box that opens, select Audit space usage.

Review the space usage report.

Audit Space Usage dialog box highlights the percentage and byte size of elements like images, fonts, and forms in a PDF file. — Use the audit space usage report to analyze which elements are taking up space in your PDF.

Select OK.

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