PDF compression guides
How to Compress a PDF with Screenshots
Treat screenshots as readable evidence: reduce unnecessary image weight, then inspect text at the size reviewers will use.
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Screenshots can make a PDF unexpectedly large because each page may contain a full-resolution raster image. Compress a copy with a moderate image-aware setting, then inspect small interface labels, annotations, cursor details, and color-coded evidence. Compare the output at the intended viewing size and zoom before sharing; if a screenshot is the evidence, a smaller file is not worth making it ambiguous.
Separate readable evidence from decoration
A screenshot used to prove a setting, error, or result must retain the labels that establish context. A decorative screenshot can tolerate more reduction. Start by deciding which pixels carry evidence, then use PDFStay's image-aware compression and compare those pixels with the source.1, 2
| Screenshot use | Protect | Test |
|---|---|---|
| Proof of a setting or result | Labels, values, timestamps | Read at 100% and zoom |
| Illustrative context | Main layout and callouts | Check the page at normal size |
Use a representative-page workflow
- Mark pages with the smallest or most important screenshot text.
- Compress a duplicate and download the result.
- Compare marked pages with the original at full size.
- Review the remaining pages before distributing the file.
FAQ
Why are screenshots expensive inside a PDF?
Screenshots are raster images, and a page-sized image can contain far more pixels than a reader needs. Repeated screenshots can therefore dominate the PDF's byte size.
How do I know a compressed screenshot is still useful?
Read the smallest labels, values, and annotations at the intended viewing size, then zoom into important evidence and compare it with the original.
Sources
- PDFStay — Compress PDF workflowPDFStay first-party methodologySource reviewed:
- PDFStay reproducible compression checksPDFStay first-party methodologySource reviewed: