PDF Compressor
Use PDF Compressor
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About this tool
Reduce PDF file size with adjustable compression levels while keeping text readable and images usable.
- 100% free with no usage limits
- No sign-up or login required
- Runs right in your browser
- Privacy-friendly and fast to use
Docs
Reduce PDF file size with adjustable compression levels while keeping text readable and images usable.
Key Features
- Three Compression Levels: Light (near-lossless), Medium (balanced), and Heavy (maximum reduction) to fit different needs
- Smart Image Downsampling: Automatically detects embedded image DPI and downscales when above the target threshold
- Stream Optimization: Cleans up redundant objects, recompresses cross-reference tables and object streams
- Privacy First: Files are processed in memory and automatically deleted after download
- Cross-Platform: Pure web-based tool — just open your browser, no software installation needed
How to Use
- Drag and drop a PDF file onto the upload area, or click to select one
- Choose your compression level (Light / Medium / Heavy)
- Click “Compress”
- Wait for compression to finish and review the before/after size comparison
- Click the download button to save the compressed PDF
Use Cases
- Compress product catalogs with high-resolution images for email attachment limits
- Shrink contracts and reports for WeChat or messaging apps
- Pre-compress PDFs before batch thumbnail generation
- Save cloud storage space
Notes
- File size limit: 30MB
- Light compression preserves near-original quality; Heavy maximizes size reduction while retaining readability
- Text-only PDFs are already small — compression gains may be limited
- Compressed files open normally in any PDF reader
- Built on a professional PDF engine
Last verified: 2026-06-07
FAQ
Is this tool free?
Completely free, no usage limits, no signup required.
Does compression affect quality?
Three levels: Light (near-lossless), Medium (balanced), Heavy (maximum compression while readable).
What file size is supported?
Up to 30MB per file.
Are my files safe?
Files are only used for compression and auto-deleted after processing.
What engine is used?
It intelligently downsamples images and optimizes PDF streams for maximum size réduction while preserving clarity.
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