Compress PDF Online Free
Reduce PDF file size using three flexible compression levels. Choose the best balance between document quality and smaller file size.
Select a PDF File
Click to browse or drag and drop your PDF here.
PDF only · Maximum size 25MB
Secure processing
Three compression modes
No watermark
What is a PDF Compressor?
A PDF compressor reduces the storage size of a PDF document. Smaller PDFs are easier to upload, email, share, archive, and store without changing the original file format.
Choose the Right Compression Level
Low Compression
Preserves the best quality while safely optimizing the PDF structure.
Recommended
Provides a balanced result for email, uploads, sharing, and everyday use.
High Compression
Creates the smallest output by converting PDF pages into compressed images.
How to Compress a PDF
Upload your PDF
Choose or drag and drop the PDF you want to reduce.
Choose compression level
Select Low, Recommended, or High compression.
Compress the document
The tool optimizes your PDF using the selected mode.
Download the smaller PDF
Review the reduction statistics and download the result.
Common Uses
Frequently Asked Questions
Is this PDF compressor free?
Yes. You can compress PDF files online for free without signup, watermark, or hidden charges.
Which compression level should I choose?
Recommended compression provides the best balance between file size and quality. Low compression preserves maximum quality, while High compression creates smaller image-based PDFs.
Will PDF quality be reduced?
Low and Recommended modes preserve the document structure and quality as much as possible. High compression may reduce visual quality because pages are converted into compressed images.
Will text remain selectable?
Text generally remains selectable in Low and Recommended modes. High compression converts pages into images, so text may no longer be selectable or searchable.
Can I compress scanned PDFs?
Yes. High compression is especially useful for scanned and image-heavy PDF documents.
Can password-protected PDFs be compressed?
Password-protected PDFs must be unlocked before they can be compressed.
Does this tool work on mobile?
Yes. The PDF compressor works in modern browsers on Android, iPhone, tablets, laptops, and desktop computers.
Things to Know
- Output format: PDF
- Reduces file size by optimizing embedded images and structure.
- Text and vector graphics remain razor sharp.
- Highly compressed PDFs may have slightly lower image quality.