GhostScript's -dPDFSETTINGS flag maps to four internal configurations. /screen aggressively downsamples all colour images to 72 dpi — 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.
Compressor de PDF
Reduza PDFs em Até 90%
Reduza arquivos PDF mantendo a qualidade. Compactação inteligente com GhostScript.
Redução de até 90%
Qualidade preservada
Múltiplos níveis
GhostScript Quality Presets — Estimated Size Reduction
| Preset | DPI | Est. Reduction | Best For |
|---|---|---|---|
| Screen | 72 | 60–90% | Email, web |
| eBook | 150 | 40–70% | Digital reading |
| Printer | 300 | 20–50% | Office printing |
| Prepress | 300 | 10–30% | Commercial print |
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Até 100 MB grátis • Formato de Saída: PDF
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Seguro e Privado
Arquivos apagados em 2h
Processamento Rápido
Nenhuma conta necessária
Ultra Rápido
How to Convert
Converta qualquer arquivo em segundos — sem software, sem cadastro necessário.
01
Enviar
Envie seu arquivo de áudio
02
Escolher formato
Selecione o formato de saída
03
Baixar
Obtenha seu arquivo convertido
Por Que EasyConv
Why Use EasyConv
Professional-grade conversion with features designed for real-world workflows.
Potencializado por FFmpeg
Baseado em bibliotecas FFmpeg testadas.
Compressão inteligente
Reduza o tamanho mantendo a qualidade.
Controle de qualidade
Ajuste as configurações de qualidade.
Smart Image Downsampling
Embedded images are intelligently downsampled to match the chosen DPI preset — not blindly flattened.
Processamento seguro
Arquivos processados com segurança.
Fast Bulk Processing
A 100-page PDF with embedded images typically compresses in under 10 seconds using our server-side GhostScript pipeline.
300+ Formatos
Supported Formats
Detailed breakdown of every format supported by this converter.
| Format | Description | Extension | Use Case |
|---|---|---|---|
| SCREEN (72 DPI) | /screen — Lowest quality, smallest file. Images downsampled to 72 dpi. | .pdf |
Email attachments, web download links |
| EBOOK (150 DPI) | /ebook — Good quality for on-screen reading. 150 dpi images. | .pdf |
Digital distribution, tablets, e-readers |
| PRINTER (300 DPI) | /printer — High quality suitable for desktop printing. 300 dpi images. | .pdf |
Office printing, reports, presentations |
| PREPRESS (300 DPI) | /prepress — Professional print quality with colour profiles preserved. | .pdf |
Commercial printing, design files |
| DEFAULT | /default — GhostScript default, similar to Printer quality. | .pdf |
General purpose compression |
3 Passos Simples
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 10–20%. PDFs from scanned documents or with many high-res photos can reduce 70–90% at Screen quality.
No — 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 — 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+ usuários confiam em nós
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 10–25 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.
Por Que EasyConv
Comparação
Veja como nos comparamos a outras soluções
| Feature |
Our Tool EasyConv |
Adobe Acrobat | Other Online |
|---|---|---|---|
| Predefinições GhostScript | Limited | ||
| Texto permanece pesquisável | |||
| DPI de imagem ajustável | |||
| Preserva senhas PDF | Varies | ||
| No watermark on output | |||
| Grátis | |||
| Sem instalação | |||
| 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)
Qualidade
Screen 72 dpi / eBook 150 dpi / Printer 300 dpi / Prepress 300 dpi + ICC profiles
Speed
Typical: 5–15 s for a 10 MB scanned PDF; large files scale linearly
Security
HTTPS transfer · isolated temp dir · 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
Guia completo
How PDF Compression Works: GhostScript Presets and Image Downsampling Explained
PDF compression is not a single operation — 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 — not as pixels. GhostScript can still apply Flate compression to object streams, but the gains are modest (10–25%). The dramatic 60–90% 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 — 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 300–600 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 — 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.