Compress PDF Online Free - Reduce PDF File Size

1. Select Your PDF File

Drag and drop your PDF file here

or select a PDF from your computer

Original file size —

Number of pages —

File type PDF

2. Choose an Optimization Level

Select how you want the tool to process the PDF. These options control the optimization attempt, not a guaranteed percentage of compression.

Balanced

A standard optimization attempt suitable for most documents.

Maximum attempt

Rewrites the document and attempts structural optimization. A smaller file is not guaranteed.

Preserve content

Rewrites the PDF while prioritizing a conservative approach. Check the output if special features matter.

Important: This browser-based version does not recompress embedded images or guarantee removal of all redundant content. PDF files that are already optimized may remain the same size or become larger. Always compare the output with the original.

Optimization Results

Original size —

Output size —

Size change —

How to Compress a PDF

Choose a PDF file from your computer or drag it into the upload area.
Review the original file size and page count.
Select an optimization level.
Click Optimize PDF and wait for processing to finish.
Compare the original and output sizes.
Download the output if it meets your requirements.

Frequently Asked Questions

Is this PDF compressor free?

Yes. You can use the tool without paying a fee or creating an account.

Will my PDF always become smaller?

No. Results depend on the PDF's internal structure. A file that is already optimized may not become smaller and can sometimes increase in size after rewriting.

Does this tool reduce image quality?

This version does not deliberately lower image resolution or recompress embedded images. It focuses on rewriting the PDF structure, so image-heavy files may show little or no reduction.

Are my files uploaded to your server?

No. The selected PDF is processed in your browser. The PDF library is loaded from an external CDN, so an internet connection is required, but the document itself is not uploaded by this tool.

Can I compress a scanned PDF?

You can process a scanned PDF, but this version does not recompress its scanned images. A specialized image-based compression tool may be needed for substantial size reduction.

Will the PDF look exactly the same after optimization?

The tool does not intentionally alter page appearance, but rewriting can affect some specialized PDF features. Check the downloaded document before relying on it for important work.