Compress PDF Private - Client-side PDF Reducer
A private, secure, and instant PDF compressor that runs entirely in the browser using WebAssembly (Ghostscript). Reduce PDF size without uploading. 100% Client-side.
Compress PDF Files
Drag & drop PDF files here, or click to select
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Upload PDF files to start compressing
Zero Latency
No uploading or downloading wait times. The compression happens instantly.
Private by Design
Traditional tools upload your bank statements and contracts to a cloud server. We don't. The engine runs entirely on your computer.
High Efficiency
Powered by the industrial-strength Ghostscript engine for maximum file size reduction.
This tool utilizes a WebAssembly port of Ghostscript, the gold standard in PDF processing, to ensure your documents remain readable even at high compression rates.
Frequently Asked Questions
Is it truly secure to compress sensitive documents here?
Yes. Unlike most online tools, NanoKito is a secure PDF compressor that runs 100% in your browser. Your files never leave your device, eliminating the risk of server data breaches. It's safe for legal, medical, and financial documents.
How do you reduce PDF size without uploading?
We utilize a sophisticated WebAssembly (WASM) port of Ghostscript. This allows your browser to perform industrial-grade compression locally. You get the power of desktop software with the convenience of a web tool, making it the ultimate offline PDF tool.
Will compression lower the document quality?
Our Ghostscript engine is optimized to remove redundant data and downsample high-resolution images while preserving text clarity. You can choose different quality profiles (Screen, eBook, Printer) to balance between size reduction and visual fidelity.
Are there any file size limits?
Because the compression engine runs in your browser, performance depends on your device's available RAM. For most modern laptops and phones, files up to 100MB are processed smoothly. Extremely large files might require a computer with more memory.
Does this work on Mac, Windows, and Linux?
Absolutely. NanoKito is platform-independent. Whether you're on macOS, Windows 11, Linux, or even a Chromebook, you can reduce PDF size instantly without installing any software.