PDF compression presets like Screen, eBook, Printer, and Press are named for their intended use cases. Behind each name is a specific combination of image downsampling resolution, compression algorithm, and quality level. Choosing the right PDF Compression preset for a document requires understanding what each setting actually changes in the file. Applying the Screen preset to a document destined for commercial printing produces visibly degraded output. Applying the Press preset to an email attachment produces a file too large to send.
The preset names suggest a destination. The underlying settings determine whether the document will look acceptable when it arrives there. Understanding the technical differences behind each preset name makes the difference between appropriate compression and a document that disappoints its recipients.
WukongPDF's PDF Quality compression tools include preset-based and custom compression settings.
The Screen / Low Resolution Preset
In practice, the Screen preset targets documents viewed on computer monitors, phones, and tablets. It downsamples all images to approximately 72 to 96 DPI, matching the effective resolution of most screens. Color and grayscale images are compressed with JPEG at medium quality, typically 60 to 70 percent. Monochrome images use CCITT Group 4 compression optimized for black-and-white text.
File size reduction is dramatic, often 80 to 95 percent for image-heavy documents. A 20 MB PDF with high-resolution photos may compress to under 1 MB. The tradeoff is that images become visibly pixelated when printed. Text screenshots become illegible because fine character details are lost at low DPI. This preset is appropriate only for documents that will never be printed.
The eBook / Medium Resolution Preset
In practice, the eBook preset targets tablets and e-readers with higher screen resolutions than desktop monitors. It downsamples color and grayscale images to 150 DPI, double the Screen preset. JPEG compression remains at medium quality. Monochrome images are preserved at 300 DPI to maintain text clarity in scanned documents.
This preset balances file size and quality for digital reading. Documents look acceptable when printed on an office printer, though photographs lack the sharpness of higher-resolution output. The eBook preset is a good general-purpose choice for digital document distribution where the document may occasionally be printed but is primarily consumed on screen.
The Printer / High Resolution Preset
The Printer preset targets office laser and inkjet printers. It downsamples color and grayscale images to 300 DPI, matching the effective resolution of most office printers. JPEG compression switches to high quality, typically 80 to 90 percent. Monochrome images remain at original resolution to preserve text sharpness.
File sizes are noticeably larger than eBook or Screen output. A 30-page document with images may be 5 to 10 MB versus 1 to 2 MB with the Screen preset. The Printer preset is appropriate for documents that will be printed on demand by recipients, including reports, proposals, and forms. The quality is sufficient for all but professional print shop requirements.
The Press / Prepress Preset
Across most tools, the Press preset targets professional commercial printing. It does not downsample images at all, or downsamples only above 450 DPI. JPEG compression is set to maximum quality or replaced with lossless ZIP compression. Color conversion to CMYK may be included depending on the tool. Fonts are fully embedded without subsetting.
File sizes can be very large, often 50 to 100 MB or more. The size is justified by print quality requirements. A brochure printed on a commercial offset press needs full resolution to reproduce fine details. A magazine photograph needs full color information. The Press preset preserves everything needed for professional reproduction at the cost of file size.
What Presets Do Not Control
Compression presets affect image resolution and compression only. They do not change text or vector graphics, which are stored as mathematical descriptions and render at any resolution. Font embedding, metadata stripping, PDF version compatibility, and Fast Web View linearization are separate settings.
A text-only document sees minimal size reduction from any compression preset because there are no images to downsample. The file size is dominated by font data and document structure. Applying the Screen preset to a text-only document does almost nothing. Applying the Press preset does almost nothing. The presets matter for image content.
Choosing the right compression preset means understanding where the document will be viewed. Match the preset to the most demanding output destination. If the document will be viewed on screen and also printed occasionally, choose at least the Printer preset. If it will only be viewed on screen, Screen or eBook are appropriate. The preset decision is irreversible: detail lost to compression cannot be recovered from the compressed file.
| Preset | Image DPI | JPEG Quality | Best For |
|---|---|---|---|
| Screen | 72-96 | Medium | Email, web, mobile viewing |
| eBook | 150 | Medium | Tablets, e-readers |
| Printer | 300 | High | Office printing |
| Press | 450+ | Maximum/Lossless | Commercial offset printing |
Creating Custom Presets for Specific Workflows
Typically, the named presets are starting points. A document with mixed content, text pages and photo pages, benefits from custom settings that apply different compression to each content type. Most PDF optimizers allow saving custom configurations as named presets. A legal firm that scans thousands of documents might create a Legal Archive preset with 300 DPI monochrome and lossless compression.
Custom presets can be exported and shared across a team for consistent output. One team member creates and tests the preset. Others import it and apply it with confidence that the output will match expectations. For organizations with standardized document workflows, custom compression presets ensure every document meets the same quality and file size standards regardless of who processes it.
Understanding PDF compression presets is understanding the tradeoff between quality and size. Each preset makes that tradeoff differently. Matching the right preset to the right document and the right destination produces output that is as small as possible while being as good as it needs to be.
The Role of PDF Version Compatibility in Compression
Compression presets often include a PDF version setting that determines available algorithms. PDF 1.4 introduced JBIG2 for monochrome images. PDF 1.5 added JPEG2000. Newer versions enable more efficient compression but may prevent opening in very old readers. For most documents, PDF 1.7 provides all modern algorithms while maintaining broad compatibility.
If compatibility with enterprise systems running older software is required, target PDF 1.4. This limits compression options but ensures the file opens in virtually any PDF reader released in the past two decades. The compatibility tradeoff is worth making for archived or widely distributed documents.
Measuring Compression Results Objectively
After applying a compression preset, record the original size, compressed size, and reduction percentage. Use Acrobat Pro Output Preview to verify effective image resolution after compression. An image that should be 150 DPI but reports 72 DPI indicates the preset did not apply correctly.
For critical documents, compare original and compressed versions side by side at 200 percent zoom. A screenshot of both at the same zoom documents what changed. This visual comparison catches compression artifacts that file size numbers alone would miss.
PDF compression presets are named shortcuts to specific combinations of image processing settings. Understanding what each preset changes enables informed choices about document quality and file size. The right preset for the right document and destination produces results that balance quality and efficiency.
When it comes to document workflows, for documents distributed across multiple channels, keep a high-resolution master and create compressed copies for each channel. The master preserves all detail. The compressed copies are optimized for their specific destinations without compromising the archival original.
PDF compression presets are the starting point for optimization, not the endpoint. Custom presets tuned to specific document types and distribution channels produce better results than any one-size-fits-all named preset. Build a library of custom presets for the document types the organization produces.
As a rule, the decision to compress a document should be documented alongside the compression settings used. A PDF that has been compressed should include notes about what was done and why, enabling future readers to understand the tradeoffs that were made.
When it comes to document workflows, for archival documents, keep the uncompressed original and store it alongside the compressed distribution version. The original preserves all detail for future use. The compressed version serves current distribution needs.
Understanding compression presets is understanding the tradeoff between quality and convenience. Each preset makes that tradeoff differently. The informed choice produces documents that balance file size and visual quality appropriately for their intended use.
Compression preset decisions should be documented in the document metadata or a companion file. A note indicating compressed with eBook preset for tablet distribution helps future readers understand why the document looks the way it does.
For most documents, the named presets are a useful shorthand for communicating compression requirements across teams. Saying compress this to eBook quality conveys a specific combination of settings without enumerating every parameter.
Mastery of compression settings develops through experimentation and measurement. Apply a preset, measure the result, compare against the original, and calibrate expectations. After a few documents, the appropriate preset becomes intuitive.
Generally, the right compression preset for the right document produces output that is as small as possible while being as good as it needs to be. Understanding the presets enables that judgment.
Compression is one of several optimization techniques available for PDFs. Combined with font subsetting, metadata cleanup, and linearization, compression presets are part of a comprehensive document optimization toolkit.