Compress PDF
Reduce PDF file size by stripping redundant metadata and optimizing object streams.
Drop your PDF here to compress
Genuine client-side optimization with zero server upload
How to Use Compress PDF
Upload PDF
Select the file you want to compress.
Choose Mode
Pick Basic, Balanced, or Strong compression.
Download
View size savings and save the optimized PDF.
Key Capabilities
Local Execution
Reconstructs the PDF object catalog into a clean document container in client browser memory, strips redundant metadata streams, and compacts cross-reference tables locally using modern Flate compression.
- •Documents with bloated metadata or multiple revisions see significant size reduction.
- •Already compressed text-only files will show honest zero-reduction notices rather than fake reduction.
Understanding PDF Compression: Mechanics & Trade-offs
Raster Image Optimization vs Vector Text
PDF compression primarily targets embedded raster imagery (photos, scanned pages, and figures). Text layers, typography, and mathematical vector shapes occupy very little byte size and are preserved without visual degradation.
Why Some PDFs Compress Minimally
Documents composed entirely of vector text, forms, or images that are already aggressively compressed (such as pre-optimized WebP or JPEG streams) have little redundant data, resulting in smaller percentage reductions.
Balancing Resolution & Readability
Our compression modes allow you to select the appropriate balance between file size and display sharpness for email distribution, web publishing, or long-term storage.
- •Scanned documents with high initial DPI yield the largest compression ratios.
- •Pure digital PDFs containing only vector text and minimal images will see modest reductions.
- •All processing runs locally on your device with no document copies transmitted over external networks.
Frequently Asked Questions
Will compression degrade readability?↓
No. Our Balanced mode focuses on structural compaction and metadata stripping without rasterizing text layers.
What if my file is already compressed?↓
PDFSimplify honestly notifies you if the file cannot be shrunk further and allows you to keep the original without alteration.
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Related Guides
How to Compress a PDF and Reduce File Size in Your Browser
Techniques for shrinking bloated PDF documents by stripping orphan objects and optimizing internal streams.
How to Visually Organize, Reorder, and Delete PDF Pages
A practical guide to rearranging pages, deleting unwanted sheets, and fixing document flow using a visual grid.