Compress PDF Frequently Asked Questions
Answers about PDF compression, file size, quality, privacy, email limits, scans, and why some files do not shrink much.
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Will compressing a PDF reduce quality?
It can, mainly for images. Text and vector graphics usually stay sharp. Use standard compression first and inspect the output.
How much smaller can a PDF get?
Image-heavy or scanned PDFs may shrink a lot. Text-only or already optimized PDFs may shrink only slightly.
Can I compress a PDF for email?
Yes. Use Compress PDF to create a smaller copy, then check whether it fits your mail provider's attachment limit.
Is browser-based PDF compression private?
With PDF ME, compression runs in your browser, so the file does not need to be uploaded to an external server for processing.
Why did my PDF not shrink much?
It may already be optimized, text-only, or protected. See compression troubleshooting for checks.
Where should I start?
Start with the complete PDF compression guide. If the output is still too large, use compression troubleshooting.