Compress PDF, Reduce file size, free online
Reduce PDF file size without visible quality loss. Choose between three compression levels. 100% free, no registration, GDPR compliant.
Reduce PDF file size online
With the PDF compression tool from PDF Monster, you can quickly and effectively reduce the size of your PDF files. Depending on the content, you can reduce the file size by up to 90%, ideal for email attachments, cloud uploads or archiving. The entire process takes place directly in your browser, without software installation and without registration.
You can choose between three compression levels: Maximum compression for the smallest file size, a recommended medium level for the best balance, or minimum compression for the highest quality. The size reduction is particularly impressive for PDFs with many images or scanned documents.
How it works, Compress PDF in 3 steps
Choose quality
Select the desired compression level and click Compress.
Choose compression level
Choose between maximum compression (72 DPI), the recommended balanced level (150 DPI) or minimum compression (300 DPI) for best print quality.
Download compressed PDF
Review the result with a before/after comparison and download your optimized PDF. Processing takes only a few seconds.
Why use PDF Monster to compress?
Up to 90% smaller
Significant size reduction with minimal quality loss.
100% Secure
SSL encryption, automatic deletion after 1 hour.
Adjustable quality
Three levels: Maximum, Recommended, or Minimum compression.
Ideal for email
PDFs small enough for any email attachment.
Your data is safe with us
Data security is a top priority at PDF Monster. We know that you entrust us with confidential documents, and we take this responsibility seriously.
Encrypted transmission
All data is transmitted via a 256-bit SSL-encrypted connection. Third parties cannot view your files during upload.
Automatic deletion
After processing, your files are automatically removed from our servers. No copies are left behind.
No sharing with third parties
Your documents are never shared with third parties, not used for advertising and not permanently stored.
Servers in the EU
Processing takes place on servers in Germany. Compliance with the GDPR and European data protection standards is guaranteed.
Typical use cases for PDF compression
Send PDF by email
Many email providers limit attachments to 10-25 MB. Compress your PDFs so they can be easily sent by email.
Save storage space
Reduce the file size of your PDF archives by up to 90% and save valuable storage space on hard drives and in the cloud.
Optimize job applications
Many application portals have size limits for uploads. Compress your application PDFs to the allowed size.
Reduce scanned documents
Scanned PDFs are often very large. Compression significantly reduces the file size without affecting readability.
Prepare for web upload
Compress PDFs for upload to websites, content management systems or online forms with size restrictions.
Digital archiving
Optimize large PDF collections for long-term archiving and save significant storage space.
Frequently asked questions about PDF compression
How much can I compress a PDF?
Depending on the content, you can reduce the file size by up to 90%. Compression is especially effective for PDFs with many images or scanned documents.
Does compression affect the quality?
You can choose between different quality levels: low, medium, and high. At high quality, the difference from the original is barely visible to the naked eye.
What is the maximum file size allowed?
You can upload and compress PDFs up to 100 MB. For larger files, we recommend splitting the PDF into smaller parts first.
Are images in the PDF compressed?
Yes, the compression primarily optimizes embedded images, as these typically take up the most storage space. Text content remains unchanged and sharp.
Can I compress multiple PDFs at once?
Yes, you can upload multiple files at once and they will all be compressed with the same settings. This saves a lot of time for larger projects.
Reduce PDFs online, no software, directly in your browser
PDF Monster offers you a complete collection of free PDF tools. In addition to compressing PDFs, you can also merge, split, edit your documents or convert them to other formats like Word. All tools work directly in the browser, are GDPR compliant and require no installation or registration.