Compress PDF | Reduce PDF File Size Online for Free

Is Smallpdf’s PDF compressor free to use?

Absolutely! Our PDF compressor is free for file size reduction, similar to our other tools. You can also compress MS Office files, JPG, PNG, GIF, and TIFF images without quality loss. Note that usage limits may apply, and our "Strong" compression is a Pro feature. To begin, drag and drop your files into the tool above.

Can I compress PDFs with my whole team?

Yes! Our Smallpdf for Teams plan provides unlimited Pro access for your team. Enjoy 30+ PDF tools (edit, merge, convert, including AI) and flexible payment options for any team size.

Do I need a paid Smallpdf Pro account to compress files?

A Pro subscription isn't needed for basic PDF compression. However, Pro offers unlimited access to all tools, including "Strong" compression, for maximum file size reduction without visible quality loss.

Will compression affect fonts or document quality?

Nope! Compressing your PDFs with our tool doesn’t alter fonts in any way. Your document fonts will remain consistent and unaffected by the compression process. This means all text styles, sizes, and embedded fonts are fully preserved, maintaining the document’s professional appearance.

Is the compress tool safe to use?

We’re committed to safety and security at Smallpdf. In addition to GDPR compliance, we’re ISO/IEC certified, undergo annual security audits, and employ TLS encryption to keep your information safe. Every time you compress a file, the process is fully encrypted, ensuring your data and documents are secure from start to finish.

Can I compress PDFs on the go?

Yes, our iOS and Android mobile apps allow you to compress large PDF files on the go so you can stay productive while traveling or working remotely.

What is the best online PDF compressor?

The best PDF compressor shrinks file size without losing quality. Smallpdf’s Compress PDF tool does just that—offering fast, high-quality compression with Basic and Strong options to suit your needs. Plus, it comes with TLS encryption, GDPR compliance, and ISO/IEC 27001 certification. Try it for free—no sign-up needed!

How does PDF compression work?

Our tool analyzes your document, removes redundant data, and re-encodes large images to shrink file size—without sacrificing quality. It’s fast, efficient, and keeps your content intact.