Compress PDF
Reduce PDF file size honestly with lossless structural optimization and image downsampling.
or drag & drop PDFs here
Your files stay on your device. Nothing is uploaded.
Compress PDF shrinks file sizes so documents are easy to email and upload. We provide two honest compression methods: Recommended (Lossless Structural) which optimizes object streams and cleans unused resources without altering visual fidelity, and Strong (Image Downsampling) which optimizes embedded bitmap graphics.
Honest sizing metrics
We show exact before-and-after byte counts. If a document is already well-compressed and cannot be reduced further without severe degradation, our tool tells you clearly instead of displaying fabricated savings percentages.
How to use PDF Tool
- Select your PDF document(s): Choose your PDF file. The document is read immediately into browser memory.
- Arrange & configure pages: Drag and drop thumbnails to reorder pages, select custom page ranges, or adjust orientation as needed.
- Process on your device: Click the action button. The browser Web Worker compiles the structural changes with zero network delay.
- Download reorganized PDF: Save your finished, properly structured document directly to your device storage.
Key features & technical guarantees
100% on-device privacy
Files never leave your browser. Zero cloud uploads, zero external telemetry, zero persistent document caching.
Instant browser speed
Runs at native CPU speed via Web Workers. Recommended file size up to 100 MB for smooth in-browser operation.
Frequently asked questions about PDF Tool
Will the quality of my document be affected?
No. Page restructuring is lossless. All page content, embedded fonts, vectors, and graphics are preserved identically.
Are my files uploaded to an external server?
Never. All operations execute strictly on your device using client-side JavaScript. Your files never leave your computer or phone.
Can I cancel processing if needed?
Yes. You can hit Cancel or Start Over at any time to instantly terminate the worker and clear all buffered data from memory.