What compression changes
Compression may downsample images, remove unused data, or rewrite parts of the file. The result can be smaller, but it may not be visually identical to the original.
How to review output
Open the compressed file and check images, text clarity, page count, links, and forms. For important files, compare before and after file sizes and keep the original.
Common mistakes
Do not assume maximum compression is best. Very small files can look blurry or lose detail.
FAQ
Can every PDF shrink?
No. Some PDFs are already optimized or mostly text.
Does compression remove sensitive content?
No. Use metadata removal or redaction workflows where appropriate, and review the result carefully.