Compress PDF
Reduce PDF file size with adjustable quality and browser-based processing.
Drag and drop your file here
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PDF only - Maximum 50 MB - Browser processing
Reduce Size
Create a smaller version of your PDF.
Three Levels
Choose the right quality and file-size balance.
Browser Processing
Files are processed directly in your browser.
Compress PDF Online and Reduce PDF File Size
ClearKitPDF lets you compress PDF files online without requiring desktop PDF software. Choose a compression level, process the file directly in your browser, compare the original and compressed sizes, and download the result.
How to Compress a PDF Online
- Upload your PDF file.
- Choose Low, Recommended, or High compression depending on the balance you want between quality and file size.
- Click the Compress PDF button.
- Compare the original and compressed file sizes.
- Download your compressed PDF.
Which Compression Level Should You Choose?
Low Compression: Useful when preserving more visual quality is important.
Recommended: A balanced option for many PDFs when you want a practical combination of readability and smaller file size.
High Compression: Useful when reducing the file size is more important than preserving as much visual quality.
Why Didn't My PDF Get Smaller?
Some PDFs are already highly optimized, so they may not become smaller after processing. Text- and vector-heavy PDFs can also behave differently from scanned or image-heavy documents. This browser-based tool rebuilds PDF pages as compressed images, so results can vary between different types of PDFs.
Is ClearKitPDF Compress PDF Free?
Yes. You can use this PDF compression tool online to reduce document size without installing desktop PDF software.
Are My PDF Files Uploaded?
The compression operation is performed directly in your browser. The tool does not need to upload your PDF to a ClearKitPDF server for the compression process.
When Should You Compress a PDF?
Compressing a PDF can be useful when a document is too large to email, upload to a website, store efficiently, or share with someone else. The amount of size reduction depends on the original PDF and the type of content it contains.
Compress PDF FAQ
How do I compress a PDF online?
Upload your PDF, choose a compression level, process it in your browser, then compare and download the result.
Which compression level should I choose?
Recommended is a balanced choice for many PDFs. Low favors visual quality, while High prioritizes a smaller file size.
Are my PDF files uploaded?
The compression operation is performed directly in your browser and does not require uploading the PDF to a ClearKitPDF server.
More PDF Tools
Continue working with your documents using other ClearKitPDF tools.
About compression
This browser version works especially well for scanned and image-heavy PDFs. Some text/vector PDFs may not become smaller because they are rebuilt using compressed page images.
ClearKitPDF - PDF tools made simple.