MoonPDF Compressor
Compress PDF files online. Reduce PDF size without losing quality. Fast, free, and browser-based.
Drag & drop your PDF file here, or browse files
Supports PDF • Max 10MBdocument.pdf
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Compressed!
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0% reduction
How to Compress a PDF Online
Compressing PDF files online has never been easier. Our free PDF compressor tool helps you reduce PDF size without losing quality. Here's how:
- Upload your PDF — Drag and drop or click to browse.
- Choose compression level — Select Low, Medium, or High compression.
- Click "Compress PDF" — Our tool processes your PDF instantly in your browser.
- Download — Save your compressed PDF with one click. No sign-up required.
Why Use a PDF Compressor?
Compressing PDFs is essential for many tasks. Here's why you might need to compress:
- Email attachments — Reduce PDF size to fit email limits.
- Save storage space — Compress PDFs to save disk space.
- Faster uploads — Smaller files upload quicker.
- Web sharing — Share PDFs without large file size.
Features of Our PDF Compressor
- 100% free — No hidden charges, no sign-up required.
- Browser-based — Your files never leave your device.
- Multiple compression levels — Low, Medium, High.
- Preserves quality — Optimize without losing readability.
- Lightning fast — Compress PDFs in seconds.
- No uploads — All processing happens locally in your browser.
Frequently Asked Questions
How to reduce PDF size for free?
Upload your PDF to our tool, choose a compression level, and click "Compress PDF". Download your compressed file instantly. No sign-up, no payment.
Is this PDF compressor free?
Yes! Our PDF compressor is 100% free. Use it as many times as you want with no limits.
Which compression level should I choose?
Low — Best quality, slightly smaller file.
Medium — Balanced quality and file size.
High — Smallest file size, good for sharing.
Medium — Balanced quality and file size.
High — Smallest file size, good for sharing.
Is my PDF uploaded to your server?
No. All processing happens locally in your browser using PDF.js. Your file never leaves your device. Privacy is our priority.
What is the maximum file size?
You can compress PDFs up to 10MB.
Does it preserve the original quality?
Yes! Our compressor maintains the readability and quality of your PDF. The "Low" compression level preserves maximum quality.