🗜️PDF Compress – Free Online PDF File Size Reducer Tool
Compress PDF files online securely and instantly. This browser-based PDF compressor tool reduces file size while maintaining high visual quality. No upload, no server processing – all compression happens locally on your device for complete privacy and security.
Select PDF File to Compress
Drag & Drop your PDF here or click below to browse your files.
📘 What is a PDF Compressor?
A PDF compressor reduces the size of PDF files by optimizing images, removing unnecessary metadata, and streamlining internal file structure. This makes files faster to share and easier to upload to email, cloud storage, or websites. Unlike server-based compressors, this tool performs compression directly in your browser using PDF-Lib JavaScript library.
⚙️ How to Compress PDF Files Online
- Click the “Choose PDF File” button to select your document.
- Pick a compression level (Low, Medium, or High).
- Click Compress PDF to begin the process.
- Download your optimized file instantly — all done locally and securely.
🔒 Is It Secure?
Yes! This PDF compressor runs entirely within your web browser. Your files never leave your device — ensuring complete privacy, no uploads, and no data tracking. Learn more about secure file processing from trusted sources like MDN FileReader API.
🌐 Learn More About PDF Optimization
❓ Frequently Asked Questions
How does this PDF compressor reduce file size?
It optimizes embedded images and removes redundant objects from your file. This ensures smaller PDFs while preserving text clarity and layout.
Does this tool work offline?
Yes. All processing happens locally inside your browser. Your PDF never gets uploaded to a server.
Can I compress large PDFs over 50MB?
For security and performance reasons, the tool currently supports files up to 50MB. You can split larger PDFs first using free PDF splitters.
Will the quality of my document be affected?
No significant loss of quality occurs with low or medium settings. High compression reduces image resolution slightly to achieve a smaller file size.
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