100% Client-Side PDF Compressor
Reduce large PDF document sizes directly on your device. All processing runs locally inside your browser—no files are uploaded to any server.
Click to Upload or Drag & Drop PDF
Supports multi-page documents (Max: 100 MB)
How Client-Side PDF Compression Works
Unlike standard online PDF converters that upload confidential documents to remote cloud servers, our tool processes documents 100% locally inside your browser sandbox:
- Local Rendering Engine: PDF.js rasterizes vector and text layers on local device memory without data transfer.
- Adaptive Canvas Resampling: Page canvases are rescaled and compressed using standard high-efficiency JPEG chroma-subsampling.
- Vector Reconstruction: jsPDF reassembles pages into an optimized, lightweight document ready for instant download.
Compression Presets Overview
Choose the preset that matches your file size targets:
| Preset | Quality Level | Typical Reduction | Recommended Use Case |
|---|---|---|---|
| Low Compression | 75% Clarity / 1.2x Scale | 30% – 45% | Portfolios, graphical presentations, high-res manuals |
| Medium Compression | 60% Clarity / 1.0x Scale | 50% – 65% | Job applications, email attachments, academic papers |
| Extreme Compression | 45% Clarity / 0.8x Scale | 70% – 85% | Government portals, strict upload limits (< 1 MB / < 200 KB) |
Strict Data Privacy:
Your bank statements, government IDs, invoices, and resumes remain completely safe. No file leaves your computer or phone at any point during compression.
Frequently Asked Questions
Is there a file size or page limit?
Because processing happens on your device's memory (RAM), files up to 100 MB and documents containing up to 150 pages can be compressed easily.
Can I compress password-protected PDF files?
Encrypted PDF files must be unlocked before compression so the browser rendering engine can access and optimize each page.