Compress PDF

Getting your file ready...

Compress PDFs online for quick sharingfast uploadsand optimal storage—quality intact. The compressor is free to use and works directly in your browser.

PDF size reduction up to 99%
GDPR and ISO/IEC 27001 compliant
Fully browser-based PDF compression

Shrink PDF SizePreserve Quality

Compress PDFs online for freemaintaining document quality. Reduce large files for easy sharing and storage in just a few clicks.

Fast & Effective Compression

Compress your PDF effortlessly and instantly. Simply drag and drop your file; our tool will automatically optimize it within seconds. Enjoy seamless online performance across all major platforms: MacWindowsLinuxiOSand Android. No manual adjustments needed.

A shrinking PDF showcasing Smallpdf’s Compress PDF tool options

Smaller PDFsSame High Quality

Select between Basic and Strong PDF compression for the optimal balance. Reduce file size without noticeable quality loss.

Compress PDF works by removing repetitive patterns to shrink your PDF.

Secure CompressionTrusted Worldwide

Your documents are secured with TLS encryptionadhere to GDPRand are ISO/IEC 27001 certified. For your privacywe automatically delete files after one hour.

4-step instructions to compress PDF files

How To Compress a PDF Online for Free

Drag & drop your file into our free PDF Compressor tool.
Choose Basic or Strong (Pro) compressionthen click ‘Compress’.
If needededit your PDF with our other tools.
Download or share your compressed file when you’re done.

Everything You Need in a PDF Compressor

Start Immediately—No Fuss
Compress PDFs directly in your browser—no installationssign-upsor learning curves. Just uploadcompressand be on your way.
Compress Files on Any Device
We’re cloud-basedso you can reduce your file size online via any browser and on any devicefrom desktop to tablet and mobile.
Compress PDFs & Other File Formats
Compress more than just PDFs. Use the tool to reduce other file typessuch as WordPPTExcelJPGPNGGIFand TIFF.
GDPR Compliance
Smallpdf is GDPR compliantwhich means we’re transparent about how we storecollectand process your personal data.
ISO/IEC 27001 Certified Security
We’re ISO/IEC 27001 certifiedso we’re audited annually to ensure the safetysecurityand integrity of your information.
File Transfer Encryption
We keep your documents secureeven while you’re working on themwith state-of-the-art TLS encryption technology.

PDF Compressing FAQs

Is Smallpdf’s PDF compressor free to use?
Absolutely! Our PDF compressor is free for file size reductionsimilar to our other tools. You can also compress MS Office filesJPGPNGGIFand TIFF images without quality loss. Note that usage limits may applyand our "Strong" compression is a Pro feature. To begindrag 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 (editmergeconvertincluding 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. HoweverPro offers unlimited access to all toolsincluding "Strong" compressionfor 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 ssizesand embedded fonts are fully preservedmaintaining 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 compliancewe’re ISO/IEC certifiedundergo annual security auditsand employ TLS encryption to keep your information safe. Every time you compress a filethe process is fully encryptedensuring your data and documents are secure from start to finish.
Can I compress PDFs on the go?
Yesour 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 fasthigh-quality compression with Basic and Strong options to suit your needs. Plusit comes with TLS encryptionGDPR complianceand ISO/IEC 27001 certification. Try it for free—no sign-up needed!
How does PDF compression work?
Our tool analyzes your documentremoves redundant dataand re-encodes large images to shrink file size—without sacrificing quality. It’s fastefficientand keeps your content intact.