PDF Size Reducer: Reduce PDF File Size Online Securely
Compress and reduce PDF document sizes using server-side Ghostscript optimization to meet email and portal upload limits.
Privacy & Security Guarantee
Your file is sent securely to our server for conversion and deleted automatically after 30 minutes.
How to Use the PDF Size Reducer: Compress PDF File Size Online
- 1Upload your heavy PDF document.
- 2Our server applies Ghostscript compression profiles.
- 3Download your reduced, email-ready PDF.
Formula & How It Works
Ghostscript PDF Re-distillation
Re-processes PDF streams using gs -dPDFSETTINGS=/ebook /screen with FlateEncode image optimization.
Worked Examples
Compressing 25 MB Scanned PDF
Input: annual-report.pdf (25 MB)
Explanation: 84% file size reduction with preserved readability.
Frequently Asked Questions
Is my uploaded PDF deleted after compression?▼
Yes. Files are processed in isolated temporary sandboxes and automatically deleted after 30 minutes.
Quick Reference & Conversion Table
| Compression Profile | Image DPI | Typical Size Reduction |
|---|---|---|
| Screen (/screen) | 72 DPI | 70% – 85% reduction |
| Ebook (/ebook) | 150 DPI | 50% – 70% reduction |
| Prepress (/prepress) | 300 DPI | 20% – 35% reduction |
⚠️ Common Pitfalls to Avoid
- •Compressing already-optimized pure text PDFs and expecting large byte reductions.
💡 Practical Real-World Uses
- •Shrinking resumes and college application documents to meet strict 2 MB portal limits.
Related Online Tools
Explore complementary calculators and converters with instant client-side execution
Flatten PDF: Lock Form Fields & Annotations
Lock fillable PDF forms, annotations, and digital signatures into read-only printable pages with zero file uploads.
PDF Merger: Combine Multiple PDF Files Online
Combine multiple PDF documents into a single organized PDF file directly in your browser with zero server uploads.
PNG to PDF Converter
Combine multiple PNG images into a single professional PDF document with custom margins and page sizes.
PDF to PNG Converter
Extract PDF pages as crisp, high-resolution PNG images with customizable DPI resolution.
HTML to PDF Converter
Render HTML code and CSS markup into formatted PDF documents with live preview.
PDF Splitter (Extract Pages & Split PDF Online)
Split PDF documents into separate pages or extract custom page ranges entirely in your browser.
Explore Other Tool Categories
Browse our full collection of 50 free web utilities
Unit Converters
Exact metric & imperial conversions for weight, length, temperature & volume.
Math & Education
Percentage changes, fractions, square roots, geometry & statistics.
Date & Time
Calendar arithmetic, business day intervals, stopwatch & multi-counter.
Home & Construction
Paint coverage, pool volume, topsoil, roof pitch, square footage & materials.