GhostScript's -dPDFSETTINGS flag maps to four internal configurations. /screen aggressively downsamples all colour images to 72 dpi β suitable only for on-screen viewing. /ebook uses 150 dpi, a good balance for tablet and desktop reading. /printer preserves 300 dpi for high-quality desktop or office printing. /prepress also uses 300 dpi but additionally preserves colour profiles (ICC), overprint settings, and halftone information required for commercial offset printing.
PDF Compression Tool
Shrink PDFs by Up to 90%
Reduce PDF file size while maintaining quality. Smart compression with GhostScript.
Up to 90% reduction
Quality preserved
Multiple compression levels
GhostScript Quality Presets β Estimated Size Reduction
| Preset | DPI | Est. Reduction | Best For |
|---|---|---|---|
| Screen | 72 | 60β90% | Email, web |
| eBook | 150 | 40β70% | Digital reading |
| Printer | 300 | 20β50% | Office printing |
| Prepress | 300 | 10β30% | Commercial print |
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Up to 100MB free • Output Format: PDF
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Secure & Private
Files deleted in 2h
Fast Processing
No account needed
Blazing Fast
How to Convert
Convert any file in seconds β no software, no sign-up required.
01
Upload
Upload your audio file
02
Choose Format
Select output format
03
Download
Get your converted file
Why EasyConv
Why Use EasyConv
Professional-grade conversion with features designed for real-world workflows.
Powered by FFmpeg
Based on proven FFmpeg libraries.
Smart Compression
Reduce file size while maintaining quality.
Quality Control
Adjust quality settings.
Smart Image Downsampling
Embedded images are intelligently downsampled to match the chosen DPI preset β not blindly flattened.
Secure Processing
Files are processed securely.
Fast Bulk Processing
A 100-page PDF with embedded images typically compresses in under 10 seconds using our server-side GhostScript pipeline.
300+ Formats
Supported Formats
Detailed breakdown of every format supported by this converter.
| Format | Description | Extension | Use Case |
|---|---|---|---|
| SCREEN (72 DPI) | /screen β Lowest quality, smallest file. Images downsampled to 72 dpi. | .pdf |
Email attachments, web download links |
| EBOOK (150 DPI) | /ebook β Good quality for on-screen reading. 150 dpi images. | .pdf |
Digital distribution, tablets, e-readers |
| PRINTER (300 DPI) | /printer β High quality suitable for desktop printing. 300 dpi images. | .pdf |
Office printing, reports, presentations |
| PREPRESS (300 DPI) | /prepress β Professional print quality with colour profiles preserved. | .pdf |
Commercial printing, design files |
| DEFAULT | /default β GhostScript default, similar to Printer quality. | .pdf |
General purpose compression |
3 Simple Steps
Frequently Asked Questions
Everything you need to know about this conversion tool.
Screen for email (smallest, web view only). eBook for digital documents on tablets. Printer for documents you will print at home or office. Prepress only for commercial print production.
No. Vector text (typed text) is preserved perfectly at all quality levels. Only embedded raster images are downsampled based on the selected DPI preset.
PDFs already containing only vector text and minimal images may only shrink 10β20%. PDFs from scanned documents or with many high-res photos can reduce 70β90% at Screen quality.
No β existing PDF passwords and permissions are preserved. If you want to remove a password as part of compression, enter the password in the options field.
Yes. GhostScript re-distils the PDF but preserves all text layers. Scanned PDFs without OCR are image-only regardless β use the OCR Tool to add a text layer first.
Both use 300 dpi images but Prepress also preserves colour profiles (ICC), overprint settings, and transfer functions required for professional offset printing. For office use, Printer is identical.
12M+ users trust us
Who Uses This Tool
Real-world use cases from professionals across different industries.
Office Worker
Shrink PDF for Email
Many email systems cap attachments at 10β25 MB. Use Screen preset to reduce a scanned report from 40 MB to under 5 MB.
Web Developer
Optimise for Web Download
Reduce PDF brochure or catalogue file size so visitors download it quickly on mobile connections.
Publisher
Digital Distribution of eBooks
Use eBook preset (150 dpi) to balance reading quality and download speed for PDF books distributed online.
Print Designer
Prepare Print-Ready Files
Apply Printer preset to ensure 300 dpi image resolution that meets desktop and professional print requirements.
Records Manager
Long-Term Archive at Smaller Size
Compress bulk scan archives with eBook or Printer quality to halve storage costs without losing document legibility.
Remote Worker
Share via Mobile Hotspot
Compress large PDFs before sending through file-sharing apps to save mobile data and speed up uploads.
Why EasyConv
Comparison
See how we compare to other solutions
| Feature |
Our Tool EasyConv |
Adobe Acrobat | Other Online |
|---|---|---|---|
| GhostScript quality presets | Limited | ||
| Text remains searchable | |||
| Adjustable image DPI | |||
| Preserves PDF passwords | Varies | ||
| No watermark on output | |||
| Free | |||
| No installation | |||
| Batch processing |
Technical Specifications
Technical Specifications
Detailed technical information about our conversion engine.
Limits
- Max file size: 100 MB (free)
- Output format: PDF only
- No hard page count limit
GhostScript
PDF
Compression
dpi
Optimise
Engine
GhostScript 10.x PDF distiller (industry standard since 1988)
Quality
Screen 72 dpi / eBook 150 dpi / Printer 300 dpi / Prepress 300 dpi + ICC profiles
Speed
Typical: 5β15 s for a 10 MB scanned PDF; large files scale linearly
Security
HTTPS transfer Β· isolated temp dir Β· auto-purged in 2 h
Max reduction
Up to 90% (Screen preset, image-heavy PDF)
Text handling
Vector text fully preserved at all presets
Max file size
100 MB
Complete Guide
How PDF Compression Works: GhostScript Presets and Image Downsampling Explained
PDF compression is not a single operation β it is a combination of image downsampling, font subsetting, object stream compression, and metadata trimming. GhostScript orchestrates all of these under its quality preset flags.
The Four GhostScript Quality Presets
Why Text PDFs Compress Less
A PDF composed entirely of vector text (like one exported from Word or InDesign) already stores text as compact mathematical descriptions β not as pixels. GhostScript can still apply Flate compression to object streams, but the gains are modest (10β25%). The dramatic 60β90% reductions happen only when the PDF contains many high-resolution embedded raster images, which are downsampled to the preset DPI.
Font Subsetting During Compression
During re-distillation GhostScript also subsets embedded fonts β stripping out the glyph data for characters not used in the document. A font that originally contained 1,200 glyphs may only need 80 for a particular document. Font subsetting alone can save several hundred kilobytes in font-heavy documents.
Scanned PDF vs Digital PDF
Scanned PDFs consist of full-page raster images at 300β600 dpi per page. A 50-page scan at 300 dpi can easily exceed 30 MB. Compressing with Screen preset reduces each page image to 72 dpi β often achieving 80%+ reduction with minimal impact on legibility for text documents. For archival use, eBook (150 dpi) is a safer choice that retains clear text at a significantly smaller size.
When Compression Will Not Help
If your PDF was already compressed with GhostScript at the same or higher quality setting, re-running compression will not make it significantly smaller and may slightly inflate the file due to overhead in the new cross-reference table. PDFs that are already below 1 MB rarely benefit from further compression.